A REVISION OF THE PARASITIC WASPS OF THE GENUSMICROBRACON OCCURRING IN AMERICA NORTH OFMEXICO By C. F. W. MuesebeckOf the Bureau of Entomology, United States Department of Agriculture
INTRODUCTIONAshmetid * published the name Microbracon with the followingdescription : " I propose this new genus for the reception of thosespecies in tlie genus Bracon having the recurrent vein joining thefirst submarginal cell between its middle and its apex, restricting thegenus Bracon to those species having the recurrent vein interstitialwith the first transverse cubital. The majority of species belongingin this new genus known to me are all small and resemble certainRhyssalids." Subsequently Ashmead 2 greatly restricted the genusBracon, separating it from Microbracon by a group of characterswhich are certainly not of generic or even of subgeneric value. Sincethat date Viereck 3 has shown that the name Bracon Fabricius mustbe used for Cremnops Foerster, a genus in the Agathidinae, and 4 thatMicrobracon Ashmead becomes the valid name for Bracon of Authorsnot Fabricius.The subfamily formerly known as the Braconinae, for whichGahan 5 proposed the name Vipiinae upon the transfer of BraconFabricius to another subfamily, has been largely neglected from thestandpoint of generic revision and is at present very unsatisfactorilyclassified. Many of the genera are poorly defined, and doubtless aconsiderable number must eventually be placed in synonymy. Itis not, however, the purpose of this paper to present a revision of thesubfamily Vipiinae, and accordingly the merits of the various genericnames, apart from those which are here regarded as synonyms ofMicrobracon, will not be discussed. Merely to show the relation ofMicrobracon to the remainder of the subfamily an attempt will bemade to point out the more important characters distinguishing thisgenus from other genera or groups of genera in our fauna.
1 Bull. No. 1, Colo. Biol. Assoc, 1S90, p. 15.2 Proc. U. S. Nat. Mus., vol. 23, 1900, p. 13S.3 Bull. 83, U. S. Nat. Mus., 1914, pp. 23 and 37.4 Idem, p. 94.5 Proc. U. S. Nat. Mus., vol. -53, 1917, p. 196.No. 2580?Proceedings U. S. National Museum. Vol. 67, Art. 8.12053?25 1 1
2 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.67A study of the genus Microbracon, with the purpose of revisingthe group, has been induced by the abundant rearing of species ofthis genus in the United States Bureau of Entomology in the courseof work upon various insect pests, and by the difficulty of satis-factorily identifying these species. In the prosecution of this studythe chief repositories of the types, which are the United States Na-tional Museum, the Philadelphia Academy of Sciences, the Con-necticut Agricultural Experiment Station, and the Museum of Pub-lic Instruction in Quebec, have been visited and the types examined.Only the types of the following have not been seen : Those ofSay's four species, which are no longer in existence, so far as known
;
kansensis Viereck and piceiceps Viereck, which are in the collec-tion of the University of Kansas; diversicolor Viereck which is ondeposit at the California Academy of Sciences ; and rufomarginatusAshmead which could not be located.This paper is a contribution from the office of Gipsy Moth andBrown-tail Moth Investigations, of the Bureau of Entomology,United States Department of Agriculture. Grateful acknowledge-ment is accorded A. F. Burgess, in charge of this branch of theBureau of Entomology, for encouragement in the work and forpermission to visit the various institutions in whose collections thetypes are contained. Expression of thanks are also due, and cor-dially given, S. A. Rohwer, A. B. Gahan, and R. A. Cushman, ofthe Bureau of Entomology, for helpful suggestions and for the useof notes; and Dr. W. E. Britton, of the Connecticut AgriculturalExperiment Station, Dr. Henry Skinner of the Philadelphia Acad-emy of Sciences, and F. N. Correveau, Assistant Curator of theMuseum of Public Instruction at Quebec, for many kindnesses andfor permission to examine the types in their custody.CLASSIFICATIONSuperfamily ICHNEUMONOIDEAFamily BRACONIDAESubfamily VipiinaeBraconoidae Foerster, Verh. d. naturh. Ver. pr. Rheinl., vol. 19, 1S62, pp.227 and 234.Braconides Marshall, Trans. Ent. Soc. Lond., 1SS5, p. 1.Braconinae Cresson, Syn. Hym. North America, 1887, pp. 54 and 56.Braconidae Tribe I Marshall, in Andre, Hymen. Eur. et Alg., vol. 4, 1888,p. 6S.Braconinae Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 136.
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Szepligeti,Genera Insectorum, fasc. 22, 1904, p. 10.Vipiinae Gahan, Proc. U. S. Nat. Mus., vol. 53, 1917, p. 196.Head varying from transverse to cubical; mandibles normal,touching or crossing at tips and forming with the emarginate and
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 3
anteriorly somewhat elevated clypeus, a more or less circular open-ing ; occiput entirely immargined ; anterior wing 6 with three cubitalcells; first discoidal cell always separated from the first cubital; sub-discoideus never interstitial with the first abscissa of discoideus;second abscissa of discoideus always much longer than third; sub-mediellan cell very short, never more than one-fourth the mediellancell; cubitella originating at the end of mediella; postnervellusabsent. Genus MICROBRACON AshmeadBracon Nees (part), Hymen. Icheum. affin. Monogr., vol. 1, 1834, p. 46.
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Foersteb, Verh. naturh. Ver. pr. Rheinl., vol. 19, 1862, p. 235.
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Marshall,Trans. Ent. Soc. London, 1885, p. 11.
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Cresson, Synopsis Hymen. N.Am., 18S7, p. 56.Microbracon Ashmead, Bull. Colorado Biol. Assoc. 1, 1S90, p. 15.Genotype.?Microbracon sulcifrons Ashmead (Monobasic).Habrobracon (Ashmead) Johnson, Ent. News, vol. 6, 1895, p. 324.Genotype.?Bracon gelechiae Ashmead (By designation of Viereck, Bull.83, U. S. Nat. Mus., 1914, p. 65).Macrodyctium Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 138.Genotype.?Bracon euurae Ashmead (Monabasic).Bracon Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 139.Habrobracon Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 139.Tropidobracon Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 139. Geno-type.?Bracon gastroideae Ashmead (Monobasic).Liobracon (Ashmead) Nason, not Szepligeti, Ent. News, vol. 16, 1905, p. 298.Genotype.?Bracon nuperus Cresson (Monobasic).Bracon Szepligeti, Genera Insectorum, fasc. 22, 1904, p. 27.Amyosoma Viereck, Proc. U. S. Nat. Mus., vol. 44, 1918, p. 640.Genotype.?Amyosoma chilonis Viereck (Monobasic).Habrobracon Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p. 99.Habrobracon Viereck, Bull. 22, Conn. State Geol. and Nat. Hist. Survey,1917 (1916), pp. 182 and 209.Microbracon Viereck, Bull. 22, Conn. State Geol. and Nat. Hist. Survey, 1917(1916), pp. 182 and 204.Head transverse to subquadrate, never rostriform, always widerthan long antero-posteriorly ; malar space variable but always muchless than half the eye height; eyes oval, rather broad, bare or indis-tinctly very sparsely hairy; frons not or scarcely impressed; scapeshort, not or hardly longer than first flagellar segment, broadeningevenly from base to apex, not excavated, and not prominentlyrimmed at apex ; first segment of flagellum alwaj's much longer thanpedicel, as long as or longer than the second, and never excavatedbelow nor with a prominent rim at apex ; antennal segments varyingin number from thirteen to forty or more; parapsidal groovesusually well indicated, with the mesonotal lobes distinct; sometimes
6 The wing venation terminology employed in this paper is that proposed by Rohwerand Gahan, Proc. Ent. Soc. Wash., vol. 18, 1916, pp. 20-76.
4 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.67the parapsidal grooves defined only by lines of pubescence, the mesos-cutmn being rather flat; mesonotum, pleura and propodeum usuallysmooth and polished, although sometimes very finely sculptured;suture between mesoscutum and scutellum finely foveolate; propo-deum rarely with a median longitudinal carina, but frequently witha stub of a median ridge at apex ; wings varying from clear hyalineto strongly infumated; usually dusky on the basal two-thirds; ner-vulus interstitial with basal vein ; recurrent vein entering first cubitalcell ; second cubital cell varying greatly in length, the second abscissaof radius being sometimes no longer than the first abscissa, some-times much more than twice as long; radius usually attaining wingmargin near the apex of wing, rarely much before ; spurs of posteriortibiae rather short, never distinctly half the metatarsus; abdomenelliptical or ovate, conspicuously angled at the junction of first andsecond segments; the first abdominal tergite with lateral membra-nous margins, the chitinized plate of this tergite with two obliquegrooves converging anteriorly; second abdominal tergite withoutlateral oblique diverging impressions; suturiform articulation fre-quently broad and foveolate; none of the foliowing sutures deep orfoveolate; third tergite without transverse or oblique impressionssetting off the anterior lateral corners of the tergite ; abdomen vary-ing from entirely smooth and polished to entirely rugulose or gran-ular; ovipositor sheaths varying from less than one-fourth thelength of the abdomen to longer than the entire body. This genusincludes the smallest of the Vipiinae; very rarely does the bodyattain a length of 5 mm.Microbracon is probably more closely related to Iphiaulax Foer-ster and its allies than to any other group of the Vipiinae, althoughits species are much smaller than most species of Iphiaulax and differconsiderably in general appearance. The species of Microbracon,however, always lack the deep and often foveolate abdominal suturesusually found in Iphiaulax and lack also the oblique lateral furrowson the second tergite, and the anterior corners of the third tergiteare never set off by transverse impressions. Coeloides of Authors,which includes Viereck's Ilabrobraconidea, differs from Microbraconespecially in the more cubical head, the excavated frons, and theshort first and second flagellar segments of the antennae which arescarcely longer than the pedicel, somewhat hollowed out beneath andflaring a little at the apex. The group typified by Atanycolus Foer-ster is readily distinguished by the cubical head and impressedfrons, and the scape, which is large, cylindrical, conspicuousl}7 ex-cavated at base and apex, with prominent basal and apical margins,and supported by a cylindrical stalk. From Compsobracon Ash-
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 5mead Microbracon is at once distinguished by the propodeal spiracleswhich are small and round while in the former they are large andlinear; the unusually long scape further distinguishes Compsob raeon.Zavipio Viereck is readily separated by its rostriform head, with theaccompanying very long malar space, and by the usually very shortradial cell.Habrobracon (Ashmead) Johnson, Macrodyctium Ashmead,Tropidobracon Ashmead, Liobracon (Ashmead) Nason, not Szepli-geti, and Amyosoma Viereck can not be held distinct from Micro-bracon. These groups intergrade completely, so that it is entirelyimpossible to determine where one ends and another begins. Thecharacters upon which they have been separated are by no meanssufficiently distinct or constant to serve to distinguish genera. Thegenotypes of all must, I believe, be regarded as congeneric evenby those disposed toward a large increase in the number of genera,if a thorough study is made of the group.In few groups of the Braconidae is there found so wide a range ofvariation within species as in Microbracon. Practically all charac-ters, many of them excellent characters in other groups, vary greatlyin this genus. Because of this it is always extremely desirable tohave before one a good series of specimens when attempting identifi-cations. The males are particularly difficult, exhibiting still widervariations than the females, and single specimens of this sex cansometimes be only doubtfully named. Host records are often ofmuch value, for although few, if any, of the species are restrictedto single hosts, and frequently the same species attacks both lepidop-terous and coleopterous larvae, still one species usually parasitizeshosts of the same general habit or found in the same food plants. Ina consideration of specific characters in Microbracon one is impressedby the lack of constancy in color or even color pattern, althoughsometimes there is a degree of uniformity which is of a little helpand permits the employment of color characters to a small extentin a table to species. The color of^ the face and legs?whether faceand coxae are yellowish or black?will be found of considerablehelp, although varying to a slight degree. The wings are usuallysomewhat fuscous, rarely clear hyaline, but the degree of infusca-tion varies more or less within the species, and alone is not de-pendable for the separation of species. In sculpture there is likewiseso much variation that it becomes difficult to use sculptural char-acters in a key without qualification, although the presence or ab-sence of punctate or reticulate sculpture on the frons, and on themesonotum, pleura and propodeum is very reliable. The abdominalsculpture is variable but can be relied upon to a large degree for
6 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. G7distinguishing between groups of species, when supported by othercharacters. Usually the mesonotal pubescence is restricted to theparapsidal grooves and the space behind the middle lobe, but in afew species pubescence arises over the entire surface of the lobesas well as from the parapsidal furrows; this character appears tobe very constant within species. The length of the head antero-pos-teriorly is relatively constant, and in the small number of caseswhere the difference between species is sufficient to permit the em-ployment of this character, it is good. The length of the malar space,the number and the relative length of the antennal segments haveconsiderable value, but again, must be used with care and supportedby other characters. Wing venation, particularly the length of thesecond abscissa of radius as compared with the first and thirdabscissae and with the first intercubitus, the relative length also ofthat part of cubitus which lies between the recurrent and the firstintercubitus, and the length of the radial cell, which is dependenton the point where radius attains the wing margin, will be foundvery helpful, but within limits. It will be seen from this briefdiscussion that variability is so pronounced in species of Micro-bracon that determinations should be made only after a very carefulweighing of all points. It is hoped that the following key togetherwith the notes found in the text will aid considerably in makingsuch determinations. Unfortunately it was found necessary to clas-sify the females and males separately beyond the thirteenth couplet.By doing this it has been possible to present a key to the femaleswhich will probably be found quite satisfactory; while if themales had been incorporated the fullest use could not have beenmade of the variations in the length of the ovipositor sheaths betweendifferent species, one of the most valuable characters. Any key tothe males of Microbracon must, it seems to me, be rather unsat-isfactory, because of the apparently complete intergradation ofspecies. The one here given will, however, probably serve to identifythe normal males. The identity of those which represent the ex-tremes in variation must often be left in doubt unless they can beconnected by biological records with females or more normal males.In the following table 66 species are included in the female key and73 species in the male key; seven species which are known only inthe male sex, and in all cases but one based upon a single specimen,can not be placed in the female key because of the necessity of mak-ing much use of the relative length of the ovipositor sheaths in thispart of the table. Some other species are known only from femalespecimens, and in these cases the position assigned in the male keywas determined by characters exhibited by the females, after making
aht. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 7
necessary allowance for sexual variations. It has seemed desirableto place several of the species in two different positions in the femalekey. KEY TO THE SPECIES OF MICROBRACON1. Mesoscutum and scutellum more or less, the lateral face of pronotum,the meso- and meta-pleura, propodeum and posterior coxae minutelyclosely punctate or reticulate, opaque 2.Mesoscutum, scutellum, lateral face of pronotum mostly, and mesopleurasmooth and polished 10.2. Second abscissa of radius about twice as long as the first, decidedlylonger than first intercubitus and usually distinctly more than half thethird abscissa of radius ; pubescence on mesoscutum restricted to theregion of the parapsidal furrows ; ovipositor sheaths sometimes nearly aslong as the abdomen 3.Second abscissa of radius much less than twice as long as, often scarcelylonger than, the first, not or scarcely longer than first intercubitus, andmuch less than half the third abscissa of radius ; pubescence on meso-scutum usually not restricted to the parapsidal furrows, but arising overthe surface of the lobes as well; ovipositor sheaths at most but littlemore than half as long as the abdomen 5.3. Parapsidal furrows rather thickly hairy, anteriorly as well as posteriorly;propodeum without a distinct median longitudinal groove; the portionof cubitus between first intercubitus and recurrent about half as longas first intercubitus; ovipositor sheaths less than half as long as theabdomen 1. quinnipiacorum Viereck.Parapsidal grooves sparsely hairy, especially anteriorly ; propodeum witha median longitudinal groove; the portion of cubitus between firstintercubitus and recurrent very short, the recurrent being nearly inter-stitial with first intercubitus ; ovipositor sheaths as long as the ab-domen beyond first tergite 4.4. Mesoscutum uniformly closely punctate and opaque; frons with a dis-tinct median longitudinal groove descending from median ocellus ; an-tennae slender, the flagellar segments much longer than broad; lastabscissa of cubitus not distinctly longer than the preceding abscissa
;
third abscissa of radius not distinctly longer than the first and secondcombined 2. punctatus, new species.Mesoscutum shining, smooth and polished anteriorly; frons without adistinct groove below median ocellus; flagellar segments of female an-tennae rather stout, mostly but very little longer than broad; lastabscissa of cubitus much longer than the preceding abscissa ; thirdabscissa of radius distinctly longer than the first and second com-bined 3. sphenophori, new species.5. Second abdominal tergite rugulose or ruguloso-punctate, usually longi-tudinally so; if not distinctly rugulose then with a basal median em-bossed area set off by short longitudinal grooves; suturiform articula-tion usually rather broad and foveolate ; oblique furrows on first tergiteoften broad and distinctly foveolate 8.Second abdominal tergite evenly closely punctate, or finely granular, notrugulose, and without a basal median area set off by longitudinal im-pressions ; suturiform articulation usually very fine; oblique furrowson first tergite usually narrow, not foveolate 6.
8 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.67
6. Ovipositor sheaths at least half as long as the abdomen ; cubitus betweenrecurrent and first intercubitus at least as long as recurrent, usuallydecidedly longer ; propodeum without a median longitudinal carina onposterior half 4. gelechiae (Ashmead).5. diversicolor (Viereck).Ovipositor sheaths less than half as long as the abdomen ; cubitus betweenrecurrent and first intercubitus not longer than recurrent, often shorter;propodeum with a median longitudinal carina on posterior half 7.7. Scutellum broad, at least as broad as long, very faintly sculptured, sub-polished ; first abscissa of radius at least as long as second, usually alittle longer ; radial cell very short, not longer than third cubital cell
;
metacarpus not longer, usually shorter, than third abscissa of radiuscubitus between recurrent and first intercubitus nearly or quite as longas recurrent ; last abscissa of cubitus much more than twice the pre-ceding abscissa G. erucarum (Cushman).Scutellum a little longer than broad at base, minutely reticulately sculp-tured and opaque; first abscissa of radius not as long as the second;metacarpus longer than third abscissa of radius ; cubitus between re-current and first intercubitus much shorter than recurrent ; last abscissaof cubitus not more than twice the preceding abscissa.7. americanus (Ashmead).8. Antennae rather stout, distinctly tapering somewhat toward the tip, inthe female 19 to 22-segmented, the flagellar segments but very littlelonger than broad ; head and thorax usually mostly yellowish ; theblack oeellar spot usually nearly separated from the occipital spot ; facemostly or wholly pale 8. cushmani, new name.Antennae slender, not distinctly tapering toward the tip ; flagellar seg-ments in the female much longer than broad : head and thorax usuallymostly black ; oeellar and occipital spots broadly confluent ; face largelyblackish 9.9. Ovipositor sheaths fully half as long as the abdomen; second abdominaltergite and the third basally not longitudinally rugulose; the obliquefurrows on first tergite not distinctly foveolate; the portion of cubitusbetween recurrent and first intercubitus longer than recurrent; firstabscissa of radius very nearly or quite as long as the second.9. platynotae (Cushman).Ovipositor sheaths less than half as long as the abdomen ; second abdominaltergite and the third basally longitudinally rugulose ; the oblique fur-rows on first tergite broad and foveolate; the portion of cubitus betweenrecurrent and first intercubitus not longer, usually shorter, than recur-rent ; first abscissa of radius nearly always shorter than second.10. xanthonotus (Ashmead).10. Second abscissa of radius not or scarcely longer than the first abscissa,not longer than first intercubitus and hardly one-third as long as thirdabscissa of radius ; mesonotal lobes pubescent ; antennae stout, taperingto the tip, the female antennae 13 to 19-segmented and not extendingbeyond the apex of the thorax ; ovipositor sheaths hardly half as longas the abdomen 11.Second abscissa of radius much longer than the first abscissa, longer thanfirst intercubitus, and very rarely less than half as long as third abscissaof radius ; mesonotal lobes usually bare, the pubescense nearly alwaysrestricted to the region of the parapsidal furrows ; female antennae notas above 12.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 9
11. Antennae of female 13 to 15-segmented ; of male, IS to 23-segmented ; firstflagellar segment of male antennae usually distinctly longer than thesecond, the segments beyond the first but very little longer than broad
;
abdomen smooth and shining, rarely distinctly punctate.11. hebetor (Say).Antennae of female 17 to 19-segmented, very rarely 16-segmented ; of male,20 to 27-segmented, the first flagellar segment of male antennae usuallynot distinctly longer than the second, the segments beyond the first oneand one-half times as long as broad ; 3d, 4th, and 5th abdominal tergitesnearly always distinctly punctate 12. brevicornis (Wesmael).12. Stigma long and narrow, the radius arising distinctly behind its middleradial cell short, ending far before apex of wing ; first abscissa of radiusvery short, much less than half the first intercubitus ; abdomen sculp-tured above 13.Radius arising at or before middle of stigma 14.13. Propodeum mostly smooth and shining, without a complete median longi-tudinal carina ; ovipositor sheaths about as long as the abdomen13. scanticorum Viereck.Propodeum finely rugulose except at extreme base and provided with aprominent median longitudinal carina ; ovipositor sheaths about as longas the abdomen beyond 2d tergite "__ 14. pyralidiphagus, new species.14. Females 15.Males 09.15. Dorsum of abdomen mostly smooth and polished, the sculpture when pres-ent restricted to the three basal tergites, only rarely occurring on thethird ; the sculpture on second and third tergites when present usuallyin the form of longitudinal striae and usually restricted to the middletwo-thirds of the tergite ; propodeum mostly or entirely smooth andpolished ; frons usually smooth and polished, if sculptured, the face andcoxae are black ; face rarely yellow ; if so, the abdomen, including firstand second tergites, is entirely smooth and polished 1Q.Dorsum of abdomen sculptured, although sometimes very minutely so, overmost of its surface ; very rarely not distinctly sculptured beyond secondtergite, but then the latter is entirely finely granular, the frons is finelyreticulately sculptured and the face and coxae are yellow ; face andcoxae very rarely black : if so, then abdomen is distinctly sculpturedover nearly its entire surface 39.16. Ovipositor sheaths protruding at least very nearly the length of the abdomen,sometimes much longer 28.Ovipositor sheaths protruding not more than half the length of the abdomenbeyond its apex 17.17. Opening between clypeus and mandibles unusually large, its transverse di-ameter at least as long as the distance from lower margin of anteunalforamina to lower margin of clypeus ; posterior tarsi short and stout,much shorter than posterior tibiae; propodeum with a nearly completemedian longitudinal carina ; at least posterior coxae black ; ovipositorsheaths protruding less than the length of the first abdominal tergite? IS.Opening between clypeus and mandibles not so large ; posterior tarsi usuallyat least as long as their tibiae ; propodeum very rarely with a nearlycomplete median carina, and then not combining all the above char-acters 19.12053?25 2
10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67
18. Wings strongly infumated ; last segment of posterior tarsi unusually large,broadening strongly from base to apex, much longer than the second seg-ment and nearly as long as the metatarsus ; antennae usually 24 to 30-segmented ; propodeum mostly smooth except for the median carina15. gastroideae (Ashmead).Wings hyaline or very nearly ; last segment of posterior tarsi not so large
;
antennae usually 21 to 24-segmented ; propodeum finely rugulose16. brachyurus (Ashmead).19. Second abdominal tergite with conspicuous, more or less triangular, areasof weaker chitinization laterally joining the broad membranous marginsof the first tergite ; second tergite much shorter than the third ; dorsumof abdomen entirely smooth and polished, without even a suggestion ofsculpture ; longitudinal groove on lateral face of pronotum incomplete,being distinct only anteriorly 20.Second abdominal tergite not as above ; at least not agreeing entirely withthe above characterization 21.20. Head and thorax black; abdomen mostly black; legs more or less black-ish 17. melanaspis (Ashmead).Body mostly yellowish or yellowish-brown, legs, including coxae, yellow-ish 18. juncicola (Ashmead.)21. Frons entirely, and usually the vertex to some extent, closely minutelypunctate or reticulate and opaque ; parapsidal grooves entirely thicklyhairy ;*head black with contrasting yellow orbital lines; thorax short andstout, black; wings rather strongly dusky on basal half; second abscissaof radius rarely distinctly twice the first 22.Frons smooth and polished, at most with faint sculpture just above inser-tion of antennae; at least not combining all the above characters 23.22. Second abdominal tergite usually smooth and shining, and provided with twoabbreviated oblique foveolate impressions medially toward base ; scatteredpubescence arising from surface of middle lobe of mesoscutum anteriorly
;
antennae normally 21 to 25-segmented 19. politiventris (Cushman).Second abdominal tergite finely sculptured over nearly its entire surface andwithout such impressions on the basal middle; surface of middle lobe ofmesoscutum without pubescence although the long hairs arising from theparapsidal furrows lie upon the lobes ; antennae normally 24 to 29-seg-mented 20. pygmaeus (Provancher ).23. Head thin antero-posteriorly, hardly thicker at insertion of antennae thanat clypeus, the face not distinctly receding ; propodeum completely pol-ished, without a stub of a median ridge at apex; first abdominal tergitewholly smooth and polished; head and thorax black; coxae black.21. connecticutorum Viereck.Head not so thin, rather prominent just below insertion of antennae, theface receding; propodeum usually with a distinct stub of a median ridgeposteriorly 24.24. Abdomen wholly smooth and polished, the second tergite with two abbrevi-ated oblique furrows medially setting off a basal median area ; parapsidalfurrows thickly hairy ; head more than usually thick antero-posteriorly,being about as thick antero-posteriorly just below insertion of antennaeas high ; antennae normally 30 to 32-segmented, tapering distinctly towardtip ; face yellow ; thorax usually mostly yellow? 22. psilocorsi Viereck.Second abdominal tergite without oblique furrows setting off a basal medianarea; parapsidal grooves sparsely hairy; head, including face, and thoraxblack * 25.
art. 8 EEVISION OF THE GENUS MICROBRACON MUESEBECK 11
25. Second and third abdominal tergites almost entirely minutely granular;propodeum usually with a nearly complete median longitudinal carina.23. meromyzae (Gahan).Third and following abdominal tergites completely smooth and polished;second tergite only with faint roughening medially 26.26. Hypopygium attaining apex of abdomen; ovipositor sheaths slender; legs,including all coxae, and the abdomen laterally and on the venter, brightyellow ; propodeum smooth and polished with only a very short stub of amedian ridge posteriorly ; posterior tarsi slender.24. nigridorsum (Aslnuead).Hypopygium not distinctly attaining apex of last dorsal abdominal segment
;
ovipositor sheaths broad; abdomen usually black; posterior tarsi ratherstout, the last tarsal segment as long as the second and more than halfthe metatarsus 27.27. All coxae and more or less of the femora black 25. ashmeadi, new name.Legs yellow, the posterior coxae blackish at base 26. uncas Viereck.28. Antennae very slender, all the flagellar segments more than twice as long asthick ; legs including all coxae bright yellow ; wings perfectly clear hya-line, with no suggestion of duskiness 29.Antennae not so slender ; at least not combining the above characters 30.29. Ovipositor sheaths nearly as long as the body; abdomen entirely smooth andpolished; face yellow; thorax and abdomen largely yellowish.27. angelesius (Provancher).Ovipositor sheaths slightly shorter than the abdomen ; second abdominaltergite finely striate ; head, including face, black ; thorax and abdomenlargely black 2S. auripes (Provancher).30. Head thin antero-posteriorly, the face rather flat, not prominent at insertionof antennae and scarcely receding below; propodeum completely smoothand polished, without a stub of a median ridge at apex ; ovipositorsheaths at least a little longer than the abdomen, and usually fully aslong as the body; antennae normally 20 to 30-segmented 31.Head rather thick antero-posteriorly at insertion of antennae, the face dis-tinctly receding below ; propodeum usually with a stub of a median ridgeat apex ; ovipositor sheaths at most a little longer than the abdomen__ 34.31. Second abdominal tergite with conspicuous membranous or weaklychitinized areas laterally opposite the broad membranous margins of thefirst tergite; ovipositor sheaths as long as the body, antennae usually20 to 26-segmented 32.Second abdominal tergite without such membranous areas laterally; headand thorax usually black or blackish ; coxae usually, though not always,black or brown . 33.32. Head, thorax, abdomen, legs, mostly yellow; second abdominal tergiteusually as long as the third or nearly 29. rudbeckiae, new species.Head and thorax wholly black ; abdomen black except for the membranousparts of first and second tergites; second tergite much shorter thanthird 30. tenuiceps, new species.33. Ovipositor sheaths as long as the body; second abdominal tergite more orless sculptured 31. nuperus (Cresson).Ovipositor sheaths slightly longer than the abdomen; abdomen completelysmooth and polished 32. curtus (Provancher).
12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. G734. Transverse diameter of opening between clypeus and mandibles but littleor no greater than the distance from the opening to the eyes; malarspace about as long as first segment of antennal flagellum 35Transverse diameter of opening between clypeus and mandibles muchgreater than the distance to the eyes; malar space shorter than firstsegment of antennal flagellum 37.35. Thorax stout, not nearly twice as long as high ; stigma brown, with itscostal thickening and more or less of the membrane toward base, brightyellow ; antennae normally 30 to 34 segmented ; ovipositor sheaths alittle longer than the abdomen 33. hyslopi Viereck.Thorax not stout, very nearly twice as long as its greatest height
;
stigma unicolorus, brown ; antennae normally 25 to 30-segmented
;
ovipositor sheaths scarcely as long as the abdonien 36.30. Propodeum with a distinct median longitudinal carina on posterior halfand with a somewhat rugulose median line on basal half ; second abscissaof radius more than twice as long as the first ; flagellar segments ofantennae but very little longer than broad; legs usually reddish yellowor brown with only the coxae blackish 34. nitidus (Provaneher).Propodeum smootli and polished without a median carina on posterior halfand not rugulose along the median line basally; second abscissa ofradius not twice the first ; flagellar segments of antennae considerablylonger than broad; usually all coxae, trochanters, and more or less ofall femora black 35. tychii, new species.37. Second abdominal tergite more or less striate, the third entirely smoothand polished; antennae not stout, all flagellar segments much longerthan broad ; radius going practically to extreme apex of wing, the thirdcubital cell scarcely as wide at apex as the second discoidal; abdomenblack except more or less of the second and third tergites; antennaenormally 29 to 33-segmented 36. pini, new species.Second and third abdominal tergites somewhat striate, the latter weaklyso and, rarely, entirely smooth; antennae stout, most of the flagellarsegments but little or no longer than broad ; radius attaining wing mar-gin decidedly before apex of wing; third cubital cell broader at apexthan second discoidal cell ; abdomen usually mostly ferruginous, withonly the first tergite and a median spot on second black ; antennae nor-mally 32 to 37 segmented 38.38. Third abscissa of radius as long as last abscissa of cubitus ; all segmentsof antennal flagellum distinctly longer than broad ; posterior tibiaewholly black 37. sesiae, new species.Third abscissa of radius distinctly shorter than last abscissa of cubitusand scarcely as long as first and second abscissae of radius combined
;
some segments of antennal flagellum not distinctly longer than broadposterior tibiae fuscous only at apex 38. nevadensis (Ashmead).39. Second abdominal tergite almost smooth, strongly shining and providedwith two distinct abbreviated furrows that set off a basal median area,and usually with two longitudinal furrows laterally; third, fourth, andfifth tergites granular, subopaque ; antennae shorter than the body, nor-mally 20 to 24 segmented ; wings faintly dusky basally ; ovipositorsheaths as long as, or a little longer than, the abdomen ; a small yellowishspecies with a few dusky markings on thorax.39. thurberiphagae, new species.Second abdominal tergite not as above, usually more strongly sculpturedthan the following ; otherwise not combining all the above characters- 40.
art. 8 REVISION OF THE GENUS MICROBKACON MUESEBECK 1340. Antennae slender, normally 22 to 29-segmented, most of the flagellar seg-ments twice as long as thick, the basal segments of flagellum more thantwice as long as thick and not at all thicker, sometimes more slender,than the apical segments ; wings perfectly clear hyaline with not even asuggestion of duskiness; radius arising much before middle of stigma;propodeum smooth and polished ; ovipositor sheaths as long as the abdo-men or slightly shorter; legs bright yellow 41.Antennae not as above; if apparently so, then not that combination ofcharacters 43.41. Abdomen very finely sculptured, smooth laterally; second tergite minutelystriato-punctate, the following weakly punctate, strongly shining; an-tennae normally 22 to 24-segmented ; abdomen usually yellow.40. pityophthori, new species.Abdomen coarsely sculptured; suturiform articulation very broad, foveo-late; antennae normally 26 to 29-segmented; abdomen largely blackabove 42.42. Abdomen, especially second tergite, strongly longitudinally rugulose, the
.second tergite usually with a complete median longitudinal raised line;parapsidal grooves thickly hairy anteriorly as well as posteriorly; abdo-men black above, more or less yellow medially on third, fourth andfifth tergites 41. laemosacci, new species.Abdomen, coarsely granular ; parapsidal grooves not thickly hairy anter-iorly; abdomen blackish above, yellow laterally. 42. metacomet Viereck.43. Wings long and rather narrow, uniformly somewhat infumated, the wingmembrane abnormally thickly hairy over its entire surface; cubitus andsubdiscoideus nearly parallel, the second discoidal cell scarcely broad-ening apically ; radial ce^l very long, the radius going to extreme apexof wing; propodeum entirely finely rugulose; antennae slender, nor-mally more than 40-segmented ; ovipositor sheaths as long as the abdo-men or slightly longer 43. atricollis (Ashmead).Wings not as above; otherwise not that combination of characters 44.44. Propodeum entirely, except at extreme base, rugulose ; most of the flagellarsegments of antennae scarcely longer than broad ; abdomen beyond thirdtergite very faintly, almost indistinctly, sculptured ; thorax mostlyyellow 45.Propodeum usually smooth and polished, although often with short diverg-ing ridges medially behind, and sometimes very delicately punctate orfaintly minutely reticulate over a large part of its surface 46.45. Ovipositer sheaths considerably longer than the abdomen ; antennae nor-mally 33 to 36-segmented ; second abdominal tergite rather evenly finelysculptured, without a rugose area on basal middle.44. analcidis (Ashmead).Ovipositor sheaths a little shorter than the abdomen ; antennae normally29 to 32-segmented ; second abdominal tergite with an irregularly rugulosearea on basal middle 45. podunkorum Viereck.46. Ovipositor sheaths not half as long as the abdomen 47.Ovipositor sheaths more than half as long as the abdomen 50.47. Head, including the face, black; either the frons completely smooth andpolished or the parapsidal grooves thickly hairy 48.At least the face yellow ; parapsidal grooves sparsely hairy ; frons finelyreticulately sculptured 49.
14 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 6748. Parapsidal grooves thickly hairy; frons closely punctate and opaque;thorax stout; head with pale yellow inner and superior orbital lines;propodeuni without a median longitudinal carina ; antennae usually 24to 29-segmented 20. pygmaeus (Provancher).Parapsidal grooves sparsely hairy ; frons smooth and polished ; thoraxslender ; head wholly black, without pale orbital lines ; propodeum witha complete or nearly complete median longitudinal carina ; antennaeusually 28 to 32-segmented 23. meromyzae (Gahan).49. Second abdominal tergite very finely punctate ; third and following tergitesvery faintly so, almost polished ; antennae usually 29 to 33-seg-mented 46. montowesi Viereck.Abdomen closely granular above, opaque or subopaque ; antennae normally34 to 40-seginented 47. cephi Gahan.50. All coxae black ; remainder of legs more or less blackish ; head includingface, black ; thorax black ; abdomen usually red, short, broad oval,rugulose on second tergite, granular on third, fourth and fifth tergites
;
antennae normally 25 to 29-segmented; ovipositor sheaths about as longas the abdomen beyond first segment 48. hemimenae Rohwer.Coxae yellow, rarely posterior coxae somewhat infuscated, and then notagreeing entirely with the above 51.51. Propodeum smooth and polished, usually with a complete or nearly completemedian longitudinal carina ; abdomen strongly sculptured, the secondtergite irregularly rugose medially and usually much shorter than thethird ; wings decidedly infuscated ; stigma dark brown ; second abscissaof radius usually much more than twice the first ; antennae normally 34to 40-segmented ; malar space about as long as first segment of antennalflagellum ; ovipositor sheaths about as long as the abdomen, not distinctlylonger ? 49. oenotherae, new species.Propodeum without a median carina, although usually with a stub of acarina at apex ; otherwise not exactly as above 52.52. Ovipositor sheaths at most as long as the abdomen beyond first tergite_ 61.Ovipositor sheaths as long as the abdomen or longer 53.53. Second abdominal tergite finely granular or punctate, never strongly rugose
;
third and following tergites very delicately, usually very faintly sculp-tured, strongly shining; suturiform articulation fine, straight, the secondtergite hot emarginate medially ; antennae stout, the segments of theapical half of flagellum scarcely longer than broad ; malar space aboutas long as first flagellar segment; wings very nearly hyaline 54.Second to fifth or sixth abdominal tergites usually granular, the secondoften more or less rugose ; if abdomen is not distinctly granular on thirdand following tergites the antennae are more slender, or the malar spaceis much shorter than the first flagellar segment; at least not combiningall the above characters 56.54. Ovipositor sheaths about as long as the body or nearly; abdomen usuallyblack above except for the suturiform articulation and a lateral spot atbase of second tergite, which are yellow ; antennae normally 26 to 29-segmented 50. papaipemae Gahan.Ovipositor sheaths about as long as the abdomen ; second and third tergitesusually yellowish ; remainder of abdomen more or less blackish 55.55. Suturiform articulation distinctly minutely foveolate ; face yellow ; an-tennae normally 29 to 32-segmented 51. apicatus (Provancher).Suturiform articulation very fine, weakly impressed, not foveolate; facehrownish black; antennae normally 24 to 27-segmented.52. nanus (Provancher).
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 1556. Second abscissa of discoideus as long as the recurrent vein ; wings somewhatfuscous, the stigma yellow ; abdomen strongly granular above, the secondtergite more or less rugulose; suturiform articulation rather broad,foveolate, and somewhat arcuate, the second tergite somewhat emarginatebehind; flagellar segments of antennae rather stout, most ?jf them onlya little longer than broad; malar space about as long as first flagellarsegment 53. mellitor (Say).Second abscissa of discoideus not as long as the recurrent vein ; otherwisenot agreeing completely with the above 57.57. Propodeura finely punctate or granular over its posterior half, and witha median carina posteriorly ; abdomen granular on the second to sixthtergites, the second usually with an irregularly rugose area on basal mid-dle; segments of the antennal flagellum mostly but very little longer thanbroad 54. nigropectus (Provancher).Propodeum not punctate over posterior half, although usually with a shortmedian ridge posteriorly and a few lateral ridges diverging from this_ 58.58. Transverse diameter of the opening between clypeus and mandibles scarcelygreater than the distance between this opening and the eye ; malar spaceas long, or nearly, as first segment of antennal flagellum; ovipositorsheaths very slender, but broadening rather conspicuously near tip.55. furtivus (Fyles).Transverse diameter of the opening between clypeus and mandibles muchgreater than the distance between this opening and the eye ; malar spacemuch shorter than first segment of antennal flagellum 59.59. Ovipositor sheaths very nearly as long as the entire body; face usuallyblackish; abdomen usually mostly black 56. tachypteri, new species.Ovipositor sheaths about as long as the abdomen; face yellow; abdomenusually mostly yellow 60.60. Second abdominal tergite usually with a shining irregularly rugose areaon basal middle ; third and following tergites granular ; abdomenrather broad-oval ; first and second segments of antennal flagellum usuallyabout equal and usually twice as long as thick, the apical segments offlagellum slender, usually twice as long as thick ; first abdominal tergite,a median spot at base of second and more or less of the apical tergitesusually blackish 57. variabilis (Provancher).Second abdominal tergite not as above ; the tergites beyond third usuallynot granular, very faintly sculptured and shining; first segment ofantennal flagellum usually decidedly longer than second, the second nottwice as long as thick ; most of the flagellar segments beyond secondbut very little longer than broad, the apical segments stout; abdomenusually entirely yellow 5S. sanninoideae Gahan.61. Segments of antennal flagellum very stout, beyond the first scarcely aslong as broad ; second abdominal tergite very finely punctate, the fol-lowing tergites exceedingly faintly sculptured and strongly shining;propodeum finely punctate on posterior half 59. hobomok Viereck.Segments of antennal flagellum not so stout 62.62. Malar space as long as first segment of antennal flagellum ; transversediameter of opening between clypeus and mandibles scarcely greater thandistance from this opening to the eye ; stigma, including its costal marginlargely yellow, brown at apex ; second abscissa of radius much morethan twice the first ; propodeum usually minutely punctate or reticulate
16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67
over most of its surface ; abdomen granular on the second to sixthtergites ; antennae normally 29 to 35-seginented 60. caulicola Gahau.Malar space not as long as first segment of antennal flagellum ; rarelynearly so, but then not combining all the above characters 63.63. Second abdominal tergite very finely sculptured, usually a little striatemedially, the following almost smooth, exceedingly faintly, almost in-distinctly, punctate ; propodeum smooth and polished with a stub of amedian carina posteriorly 64.Second abdominal tergite more coarsely sculptured, usually with an ir-regularly rugose area on basal middle, the following tergites granular
;
rarely the third and those beyond nearly smooth, but then the propodeumis minutely punctate or reticulate over most of its surface 65.64. Coxae more or less infuscated above ; face blackish ; wings rather stronglydusky ; ovipositor sheaths about as long as the abdomen beyond 1sttergite 61. niger (Provancher).Coxae entirely pale yellow ; face yellow, wings nearly hyaline.62. aequalis (Provancher).65. Antennae normally 23 to 29-segmented, shorter than the body, the seg-ments of apical half of flagellum but little longer than wide ; second ab-dominal tergite usually as long as the first and longer than the third;malar space very nearly as long as first flagellar segment ; propodeumusually faintly punctate over its posterior half 63. argutator (Say).Antennae usually as long as the body, the flagellar segments much longerthan broad; second abdominal tergite usually shorter than the first andscarcely as long as the third 66.66. Propodeum finely punctate or reticulate or very minutely granular overmost of its surface, more coarsely roughened medially and with a medianridge posteriorly ; abdomen beyond third tergite very delicately sculp-tured, irregularly transversely lineolated 64. geraei, new species.Propodeum smooth and polished, with only a stub of a median longitudinalridge posteriorly and with some short lateral carinae diverging from thisabdomen usually granular on the second to sixth tergites 67.67. Antennae normally 34 to 40-segmented ; malar space usually distinctly morethan half the transverse diameter of the opening between clypeus andmandibles 68.Antennae normally 24 to 32-segmented ; malar space scarcely half the trans-verse diameter of the opening between clypeus and mandibles.57. variabilis (Provancher).68. Suturiform articulation slightly arcuate, the second tergite a little eniar-ginate medially behind ; first segment of antennal flagellum usually nottwice as long as wide ; first tergite and a median basal spot on secondblack; thorax usually mostly blackish 65. lutus (Provancher).Suturiform articulation straight, the second tergite not at all emarginatebehind ; first segment of antennal flagellum twice as long as wide ; secondtergite entirely yellow, without a blackish spot medially at base.66. cerambycidiphagus, new species.69. Dorsum of abdomen mostly smooth and polished, the sculpture when presentvery rarely extending to the third tergite ; propodeum smooth andpolished, sometimes with a median carina or a stub of a median ridge atapex ; frons usually smooth and polished ; if sculptured, the face andcoxae black ; face very rarely yellow ; if so, then the abdomen is entirelysmooth and polished 70.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 17Dorsum of abdomen mostly sculptured ; very rarely not distinctly sculp-tured beyond second tergite, but then frons is finely reticulately sculp-tured and face and coxae are yellow ; face and coxae very rarely blackand then abdomen is distinctly sculptured 96.70. Opening between clypeus and mandibles unusually large, its transversediameter as long as, or longer than, the distance from lower margin ofantennal foramina to lower margin of clypeus ; propodeum with a completemedian longitudinal carina ; posterior tarsi short and stout, shorter thantheir tibiae 71.Opening between clypeus and mandibles not so large ; at least not agreeingentirely with the above 72.71. Wings strongly infuscated ; last segment of hind tarsi very large, broad-ening strongly toward apex and much longer than second tarsal segment;antennae 25 to 27 segmented 15. gastroideae (Ashmead).Wings hyaline or very nearly; last segment of hind tarsi normal, notbroadening strongly toward apex and not longer than second tarsal seg-ment; antennae usually 21 to 23 segmented 16. brachyurus (Ashmead).72. Second abdominal tergite with conspicuous, more or less triangular areasof weaker chitinization laterally opposite the broad membranous mar-gins of first tergite; abdomen, including first tergite, wholly smooth andpolished, propodeum completely polished without a stub of a medianridge at apex 73.Second abdominal tergite without such membranous areas laterally; firstabdominal tergite usually more or less sculptured at apex ; propodeummost frequently, though not always, with a stub of a carina at apex__ 76.73. Antennae usually 23 to 26 segmented, usually shorter than the body ; thirdabscissa of radius distinctly longer than the first and second abscissaecombined and about twice as long as the second ; last abscissa of cubitusdistinctly longer than the preceding abscissa; wings usually ratherstrongly dusky 74.Antennae usually 28 to 32 segmented, longer than the body ; third abscissaof radius not distinctly longer than the first and second combined andnot nearly twice as long as the second ; last abscissa of cubitus not dis-tinctly longer than the preceding; wings faintly infuscated 75.74. Head, thorax, and abdomen yellowish, sometimes with fuscous markings;legs yellow ; second abdominal tergite usually as long as third, ornearly 29. rudbeckiae, new species.Head, thorax, and abdomen, black; legs black; second abdominal tergiteusually much shorter than third 30. temiiceps, new species.75. Head and thorax black; abdomen mostly black; legs more or less black-ish 17. melanaspis (Ashmead).Head, thorax, and abdomen mostly yellowish; legs yellowish.18. juncicola (Ashmead).76. Frons entirely, and usually the vertex to some extent, closely minutelypunctate or reticulate and opaque ; parapsidal grooves completely thicklyhairy; head black with contrasting yellow orbital lines; thorax shortand stout, black ; wings rather strongly infuscated 77.Frons usually smooth and polished, rarely with faint sculpture just aboveinsertion of antennae ; at least not exactly as above 78.77. Second abdominal tergite usually smooth and polished, and provided withtwo distinct short oblique foveolate impressions medially toward base;antennae usually 21 to 24 segmented; middle lobe of mososcutum withscattered pubescence arising from its surface anteriorly.19. politiventris (Cushman).
18 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67Second abdominal tergite usually finely sculptured over nearly its entiresurface and without such impressions toward the base ; antennae nor-mally 24 to 29-segmented ; surface of middle lobe entirely destitute ofpubescence although the long hairs arising in the parapsidal grooves lieupon the lobes 20. pygmaeus (Provancher).78. Head thin antero-posteriorly, hardly longer at the intersection of the anten-nae than at the clypeus, the face not strongly receding ; thorax ratherstout ; propodeum completely smooth and polished, without even a stub ofa median ridge posteriorly ; wings rather strongly infuscated on basalhalf i 79.Head not thin, rather prominent just below insertion of antennae, the facereceding ; propodeum most frequently with a distinct short stub of amedian ridge at apex 81.79. Parapsidal grooves rather thickly hairy posteriorly ; all coxae and more orless of remainder of legs, black ; first abscissa of radius usually nearly aslong as first intercubitus and much more than half the second abscissaof radius 21. connecticutorum Viereck.Parapsidal grooves exceedingly sparsely hairy 80.80. Second abdominal tergite usually with a rather prominent polished basalmedian area and with some sculpture adjoining this ; coxae and more orless of remainder of legs black 31. nuperus (Cresson).Second abdominal tergite, like remainder of abdomen, completely polished
;
legs, including all coxae, usually uniformly yellowish-red or reddish-brown 32. curtus (Provancher).81. Abdomen wholly smooth and polished, the second tergite with two shortoblique furrows setting off a basal median area ; parapsidal furrowsthickly hairy ; head more than usually thick antero-posteriorly ; antennaeusually 29 to 32 segmented, tapering distinctly toward tip; face yellow;body usually mostly yellow ; legs yellow, posterior coxae sometimes alittle infuscated 22. psilocorsi Viereck.Abdomen rarely entirely smooth and polished, and then not agreeing com-pletely with the above characters 82.82. Legs including all coxae bright yellow ; antennae never stout, all flagellarsegments decidedly longer than broad ; suturiform articulation alwaysvery fine ; wings frequently hyaline 83.Legs dark brown or blackish ; coxae black or blackish ; wings distinctlyinfuscated 88.83. Propodeum usually with a complete or nearly complete median longitudinalcarina ; second and third tergites finely sculptured ; first abdominal ter-gite mostly rugose 23. meromyzae (Gahan).Propodeum smooth and polished with only a short stub of a median ridgeposteriorly ; third tergite always entirely smooth and polished 84.84. Abdomen entirely polished with no indication of sculpture ; wings per-fectly clear hyaline ; face yellow ; thorax and abdomen usually en-tirely yellow 27. angelesius (Provancher).Second abdominal tergite nearly always a little sculptured ; face black
;
thorax and more or less of abdomen black 85.85. First abscissa of radius about as long as inner side of stigma and nearlyas long as first intercubitus ; second abscissa of radius not twice thefirst ; wings distinctly fuscous on basal two-thirds ; flagellar segmentsof antennae not twice as long as thick 67. cinctus (Provancher).Not agreeing entirely with the above 86.
abt. 8 REVISION OF THE GENUS MICTtOBEACON MUESEBECK 19
86. Propodeum somewhat sculptured medially at base and with a distinctmedian ridge on apical third ; posterior tarsi scarcely as long as theirtibiae, the last tarsal segment fully as long as the second, and stout2G. uncas Viereck.Propodeum perfectly smooth and polished except for an exceedingly short,often indistinct, stub of a median ridge at apex ; posterior tarsi longerthan their tibiae, the last tarsal segment not nearly as long as thesecond S7.87. Antennae very slender, normally 27 to 32-segmented, all flagellar segmentsat least twice as long as broad ; head entirely black2S. auripes (Provancher)-Antennae usually 33 to 36-segmented, the flagellar segments mostly lessthan twice as long as broad; head usually with very narrow inner andsuperior ferruginous orbital lines 24. nigridorsum (Ashmead).88. Posterior tarsi stout, the last tarsal segment fully as long as the second andmore than half the metatarsus ; abdomen slender ; first tergite long andnarrow, broadening gradually from base and about twice as long as broadat apex ; second tergite at most with faint sculpturing medially ; suturi-form articulation very delicate ; stigma large ; abdomen black 89.Posterior tarsi more slender, the last tarsal segment shorter than the secondand not more than half the metatarsus ; otherwise not as above 90.89. Abdomen completely polished ; wings strongly infuscated.68. wawequa ViereckAbdomen with second tergite a little striate medially ; wings slightly duskyon basal two-thirds 25. ashmeadi, new name.90. Second and third abdominal tergites rather evenly striate ; suturiform ar-ticulation broad, coarsely foveolate ; last abscissa of radius shorter thanfirst and second combined ; propodeum with a median carina on apicalhalf ; all segments of antennal flagellum longer than broad69. sulcifrons (Ashmead).Third abdominal tergite rarely sculptured and then with only very faintroughening toward base ; at least not the above combination of char-acters 91.91. Stigma yellow* at base and along costal margin; malar space about as longas first segment of antennal flagellum ; all flagellar segments longer thanbroad, the first and second of equal length 33. hyslopi Viereck.Stigma unicolorous, brown 92.92. Antennae stout, frequently broadening faintly beyond the first flagellar seg-ment, and narrowing again toward apex, most of the flagellar segmentsbut little or no longer than broad ; second abscissa of radius usuallytwice the first ; abdomen frequently ferruginous with only first tergiteand median spot on second, black 93.Antennae more slender, all flagellar segments much longer than broad
;
second abscissa of radius usually distinctly less than twice the firstabdomen black with more or less of second and third tergites pale 95.93. Antennae normally 25 to 30-segmented ; propodeum with a median carinaon apical half and raore or less rugulose on the median line toward basesecond abscissa of radius more than twice the first, the third longerthan the first and second combined ; abdomen with second and thirdtergites mostly yellowish or red, the remainder black.34. nitidus (Provancher).Antennae normally 32 to 37-segmented ; propodeum not so completelysculptured on the median line ; abdomen usually ferruginous with onlyfirst tergite and a median spot on second black 94
20 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.6794. Third abscissa of radius shorter than last abscissa of cubitus and notdistinctly as long as first and second abscissae of radius combined
;
flagellar segments of antennae mostly not longer than broad; posteriortibiae dusky only at apex _? 38. nevadensis (Ashmead).Third abscissa of radius as long as last abscissa of cubitus and fully aslong as the first and second abscissae of radius combined ; all flagellarsegments of antennae a little longer than broad ; posterior tibiae whollyblack 37. sesiae, new species.95. Propodeum with a prominent stub of a median ridge on its posterior thirdfirst abscissa of radius not as long as the side of stigma bordering firstcubital cell 3G. pini, new species.Propodeum without a distinct stub of a median carina extending one-third the distance toward base ; first abscissa of radius as long" as theside of stigma bordering first cubital cell 35. tychii, new species.96. Second abdominal tergite almost smooth, strongly shining and providedwith two distinct short furrows that set off a basal median area andusually with two longitudinal furrows laterally ; third, fourth, and fifthtergites granular ; antennae shorter than the body, usually 20 to 24-seg-mented ; radius arising much before middle of stigma ; posterior coxaestrongly infuscated 39. thurberiphagae, new species.Not agreeing entirely with the above 97.97. Antennae very slender, usually 22 to 29-segmented, all of the flagellarsegments fully twice as long as thick, the basal segments not thickerthan the apical segments, the antennae not tapering toward tip ; wingsperfectly clear hyaline ; stigma long ; radius arising much before itsmiddle; propodeum smooth and polished 98.Antennae not as above; at least not that combination of characters 100.98. Abdomen very delicately sculptured, smooth laterally ; antennae usually22 to 24-segmented ; abdomen usually yellow.40. pityophthori, new species.Abdomen coarsely sculptured ; suturiform articulation very broad, foveo-late ; antennae usually 26 to 29-segmented ; abdomen mostly blackabove 99.99. Abdomen, especially second tergite, strongly longitudinally rugose, thesecond tergite usually with a complete median longitudinal raised line
;
parapsidal grooves rather thickly hairy anteriorly as well as posteriorly;abdomen black above, more or less yellow medially on third, fourth, andfifth tergites 41. laemosacci, new species.Abdomen coarsely granular; parapsidal grooves not thickly hairy ante-riorly ; abdomen blackish above, yellow laterally- 42. metacomet Viereck.100. Wings long, unifoi-mly infuscated to apex, the wing membrane abnormallythickly hairy over its entire surface ; cubitus and subdiscoideus nearlyparallel, the second discoidal cell scarcely broadening apically ; radialcell exceptionally long, radius going to extreme apex of wing; pro-podeum entirely finely rugulose ; antennae slender and more than 40-segmented 43. atricollis (Ashmead).Wings not agreeing with the above characterization 101.101. All coxae and trochanters black ; more or less of remainder of legs,especially posterior tibiae, blackish ; head, including face, deep black
;
wings strongly infuscated ; thorax black ; abdomen usually more or lessred 4S. hemimenae Rohwer.Coxae yellow, rarely a little infuscated ; face very rarely brownish-black 102
art. 8 REVISION OF THE GENUS MIGROBEACON MUESEBECK 21102. Propodeum, except at extreme base, rugulose; most flagellar segments butvery little longer than broad; body usually yellowish; abdomen onlyvery faintly sculptured beyond second tergite 103.Propodeum usually smooth and polished, although often with divergingridges medially, and sometimes delicately punctate or reticulate overmost of its surface 104.103. Second abdominal tergite with an irregularly rugose area on basal middle
;
antennae usually 28 to 32-segmented 45. podunkorum Viereck.Second abdominal tergite rather evenly finely sculptured ; antennae usually32 to 36-segmented 44. analcidis (Ashmead).104. Propodeum faintly reticulate on its posterior half; sometimes more dis-tinctly granular over its entire surface ; thorax never wholly black__ 105.Propodeum smooth and polished, with no indication of such reticula-tion 108.105. Second abscissa of radius much more than twice the first ; radius goingto extreme apex of wing, the third abscissa of radius almost on astraight line with the second ; wings distinctly somewhat infuscated,the stigma usually yellow ; antennae rather slender, usually 30 to 36-segmented ; body entirely yellow, very rarely with propodeum and firsttergite dusky; ocell-ocular line not more than twice the diameter of anocellus GO. caulicola Gahan.Second abscissa of radius usually not more than twice the first, andusually making a distinct angle with the second 106.106. Antennae normally 23 to 29-segmented ; second abdominal tergite usuallyfully as long as the first and longer than the third ; propodeum andfirst abdominal tergite usually infuscated ; mesonotal lobes often moreor less blackish 63. argutator (Say).Antennae usually 27 to 37-segmented ; second abdominal tergite very rarelylonger than third 107.107. Flagellar segments of antennae slender; antennae composed of 27 to 33
.segments ; abdomen beyond 3d tergite usually only very faintly sculp-tured ; propodeum and first abdominal tergite usually yellow ; head,sometimes including part of face, and anterior parts of mesonotum,usually blackish 64. geraei, new species.Flagellar segments mostly only a little longer than broad; antennaenormally composed of 32 to 37 segments; third to fifth abdominaltergites granular and opaque; propodeum and first abdominal tergite,and usually venter of thorax, black 54. nigropectus (Provancher).108. Abdomen not or only indistinctly sculptured beyond third tergite, stronglyshining, suturiform articulation very fine 109.Abdomen granular on second to fifth tergites; suturiform articulationoften rather broad, foveolate 115.109. Antennae stout, most of the flagellar segments but little or no longerthan broad HO.Antennae slender, flagellar segments much longer than broad; face yellow;abdomen mostly yellow 112.110. Suturiform articulation usually finely foveolate; antennae usually 28 to33-segmented ; face yellow ; abdomen usually largely ferruginous, blackishat base and apex; frons and vertex mostly ferruginous, black onlymedially 51. apicatus (Provancher).59. hobomok Viereck.Suturiform articulation not distinctly foveolate; antennae usually 24 to29-segmented; face usually brownish-black; frons and vertex whollyblack HI.
22 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67111. First abdominal tergite with a foveolate groove just inside the lateralmargins ; abdomen black, with only the suturiform articulation and alateral spot on second tergite yellow ; segments of antennal flagellum alla little longer than broad ; posterior coxae more or less infuscated.50. papaipemae Gahan.First abdominal tergite without a distinct foveolate groove inside lateralmargins, but with elongate apical lateral pits ; abdomen with second andthird tergites mostly pale ; most segments of antennal flagellum not dis-tinctly longer than broad; all coxae yellow 52. nanus (Provancher).112. Face yellow ; all coxae bright yellow ; abdomen usually mostly yellow 113.Face brownish-black; posterior coxae more or less infuscated above;abdomen mostly blackish 61. niger (Provancher).113. Third cubital cell long, the last abscissa of cubitus much longer than thepreceding, the third abscissa of radius considerably longer than the firstand second abscissae combined ; second abscissa of radius usually nottwice the first ; abdomen black except the suturiform articulation andsecond tergite laterally 70. canadensis (Ashmead).Last abscissa of cubitus not. distinctly longer than the preceding ; thirdabscissa of radius not longer than first and second abscissae combined;second abscissa of radius at least twice the first; abdomen mostlyyellow : 114.114. Propodeum very smooth and polished with only an exceedingly short stubof a median ridge at apex ; first flagellar segment more than twice aslong as broad and distinctly longer than the scape ; scape yellow.46. montowesi Viereck.Propodeum with a median carina extending nearly half-way to the base;first flagellar segment of antennae nearly twice as long as broad, butscarcely as long as the scape; scape black_ 62. aequalis (Provancher).115. Malar space one-third as long as the eye height; ocelli very small, theocell-ocular line three times as long as the diameter of an ocellus;second abdominal tergite considerably shorter than third; sixth ter-gite, as well as all the preceding, sculptured ; propodeum usually with anearly complete median longitudinal carina ; antennae usually 33 to 40-segmented 49. oenotherae, new speciesMalar space not nearly one-third the eye-height ; ocell-ocular line notthree times as long as the diameter of an ocellus ; second abdominaltergite usually as long as the third ; sixth tergite practically alwayscompletely polished 116.116. Distance between clypeal foveae more than twice as long as malar space;antennae usually 24 to 32-segmented, very rarely with 33 or 34 seg-ments 117.Distance between clypeal foveae not distinctly twice as long as malarspace ; or, if apparently as long, then with antennae 34 to 40-segmented
;
antennae rarely with less than 33 segments 12L117. Head, including face black or brownish-black 118.Face pale yellow ; frons and vertex mostly yellow 119.118. Thorax and abdomen entirely or mostly yellow ; propodeum impressed,almost grooved along the median line, with some transverse rugae inthe depression ; thorax not stout, about twice as long as high, viewedlaterally 71. konkapoti Viereck.Thorax and abdomen mostly black ; propodeum smooth and polished ex-cept for a stub of a median ridge at apex, not impressed along themedian line; thorax stout 56. tachypteri, new species
art. S REVISION OF THE GENUS MIOROBRACON MUESEBECK 23119. Second to fifth abdominal tergites evenly granular and opaque, the secondnot longitudinally rugulose and without a median irregularly rugoseshining area ; ocell-ocular line a little more than twice the diameter ofof an ocellus ; last abscissa of radius scarcely as long as first and secondabscissae combined 72. rhyssemati (Ashmead).Second abdominal tergite usually with a median irregularly rugose shin-ing area at base, or longitudinally rugose; fourth and fifth tergites us-ually much more weakly sculptured and shining; last abscissa of radiususually a little longer than first and second abscissae combined ; ocell-ocular line scarcely twice as long as greatest diameter of an ocellus__120.120. Thorax, viewed laterally, twice as long as high ; antennae usually 31 to34-segmented, the first flagellar segment usually distinctly longer thanthe second ; abdomen usually entirely yellow beyond first tergite.58. sanninoideae Gahan.Thorax more compact, not twice as long as its greatest height ; antennaeusually 24 to 32-segmented, the first and second flagellar segmentsusually of equal length and twice as long as broad ; abdomen usuallywith first tergite, median spot on second, and more or less of apicaltergites blackish 57. variabilis (Provancher).121. Recurrent vein not distinctly longer than second abscissa of discoideus,and but very little longer than the portion of cubitus between recur-rent and first intercubitus; antennae rather stout, none of the flagellarsegments twice as long as broad ; second tergite usually slightly emargin-ate at the middle posteriorly ; wings usually infuscated, with the stigmayellow 53. mellitor (Say).Recurrent vein longer than second abscissa of discoideus and usually twiceas long as the portion of cubitus between recurrent and first inter-cubitus ; antennae usually more slender, with at least the basal flagellarsegments and the terminal segments twice as long as broad 122.122. Last segment of posterior tarsi as long as the second ; second abscissa ofradius more than twice the first ; measured on the cubitus the thirdcubital cell shorter than the second ; second abdominal tergite not ir-regularly strongly rugose on basal middle; antennae 34 to 40-segmented;thorax long, not stout 47. cephi Gahan.Last segment of posterior tarsi shorter than second ; at least not exactlyas above 123.123. Second abdominal tergite with an irregularly rugose shining area on basalmiddle ; antennae ususally 35 to 42-segmented ; malar space scarcelymore than half the distance between clypeal foveae 124.Second abdominal tergite without such irregularly rugose area on basalmiddle, evenly granular or somewhat longtitudinally sculpturedmedially : 125.124. Suturiform articulation straight, the second abdominal tergite not at allemarginate behind ; second abdominal tergite, like remainder of abdo-men, usually entirely yellow 6G. cerambycidiphagus, new species.Suturiform articulation broadly a little emarginate behind; second tergiteusually with a black median spot, and more or less of remainder of ab-domen usually blackish or fuscous G5. lutus (Provancher).125. Face more or less blackish ; second abscissa of radius not distinctlytwice the first; thorax wholly black 73. cookii (Ashmead).Face yellow; second abscissa of radius usually distinctly more than twicethe first 55. furtivus (Fyles).
24 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.67
1. MICROERACON QUINNIPIACORUM ViereckMicrobracon quinnipincorum Viereck, Bull. 22, Conn. Geol. and Nat. Hist.Survey, 1917 (1916), p. 207.Type.?In the Connecticut Agricultural Experiment Station atNew Haven.The antennae of the type are 31-segmented and slender, the basalflagellar segments twice, or nearly twice, as long as broad; irons,vertex, mesoscutum, scutellum, pro-, meso-, and metapleura, propo-deum and dorsum of abdomen entirely, uniformly finely punctate orreticulate and opaque; parapsidal grooves pubescent; the surface ofthe middle lobe of mesoscutum bare; propodeum with a stub of amedian ridge at apex; wings only very slightly dusky; second ab-scissa of radius at least twice as long as the first, the first and secondabscissae combined scarcely as long as the third; second abdominaltergite much longer than the third; in the type the ovipositor sheathsproject scarcely the length of the first abdominal tergite. Ferrugin-ous; head, thorax and base of abdomen more or less marked Avithblackish. A small species, about 2 mm. in length.Distribution.?Connecticut, Maryland.Host.?Unknown.Known only from the type, and one female specimen in the UnitedStates National Museum, labeled " Md., Collection Ashmead."
2. MICROBRACON PUNCTATUS, new speciesFemale.?Length 2.8 mm. Head rather thick antero-posteriorlyat insertion of antennae, the face receding somewhat below; faceincluding clypeus, frons, and vertex finely closely punctate andopaque; frons with a distinct median groove from anterior ocellusto the antennae; antennae 28-segmented, nearly or quite as long asthe body, the tw'o basal flagellar segments about twice as long aswide, all the following much longer than broad; mesoscutum andscutellum, pro-, meso- and metapleura, propodeum, and posteriorcoxae all finely evenly punctate and opaque; propodeum with a dis-tinct complete median longitudinal groove; pubescence on mesono-tum sparse and restricted to the parapsidal grooves; second abscissaof radius more than twice as long as the first, the latter about halfthe first intercubitus; third abscissa of radius about as long as thefirst and second abscissae combined; last abscissa of cubitus aboutas long as the preceding abscissa ; the portion of cubitus between re-current and first intercubitus very short, the recurrent nearly inter-stitial with first intercubitus; abdomen ovate; first tergite evenlypunctate, opaque; the second and third finely punctate or minutelygranular, the posterior tergites much more weakly so and more shin-ing; ovipositor sheaths as long as the abdomen beyond first tergite.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 25Ferruginous; frons, vertex and occiput piceous; antennae yellowishbelow toward base, brownish to brownish-black above and apically;wings hyaline, stigma brown ; legs ferruginous.Type.?Cat. No. 26661, U.S.N.M.Type-locality.?Nassau Count}'', New York.Host.?The type is labeled " With larva of Listronotus latiusculus."Described from a single specimen taken by F. H. Chittenden.
3. MICROBRACON SPHENOPHOR1, new speciesFig. 6Female.?Length 3 mm. Head very nearly as long antero-pos-teriorly as high; e}7es rather small, hardly more than half as longas the height of head ; distinctly though sparsely hairy ; malar spaceshort, less than half the transverse diameter of the opening betweenclypeus and mandibles, which is about equal to the distance frombase of antennae to clypeus; face and frons closely minutely punc-tate and opaque, the vertex faintly punctate; vertex and templesbroad; frons without a distinct median groove descending frommedian ocellus; ocell-ocular line more than three times the diameterof an ocellus; antennae missing beyond 19th segment; first flagellarsegment about twice as long as broad, much longer than the second,the following but very little longer than broad; mesoscutum andscutellum very faintly punctate, more distinctly so in the region ofthe parapsidal grooves, shining; anteriorly the mesoscutum is verysmooth and shining, not distinctly punctate; pleura entirely, pro-podeum and posterior coxae, minutely evenly punctate and sub-opaque ; the propodeum with a more or less distinct median furrow
;
pubescence on mesoscutum very sparse and restricted to the parap-sidal furrows; fore wing with radius going nearly to the apex;second abscissa of radius fully twice the first, but the first andsecond combined less than the third; the first abscissa of radiusabout half the first intercubitus ; last abscissa of cubitus much longerthan the preceding; the portion of cubitus between recurrent andintercubitus very short, the recurrent nearly interstitial with firstintercubitus; posterior femora rather stout, but little more thanthree times as long as broad ; abdomen long and narrow ; firsttergite evenly punctate, like the propodeum; the following tergitesvery minutely punctate, becoming gradually less distinctly so pos-teriorly, the apical tergites being smooth and shining; ovipositorsheaths as long as the abdomen beyond the first tergite. Entirelyyellow including antennae and legs; wings hyaline, stigma andveins yellowish.Male.?Essentially as in the female; the malar space is a littleshorter; the antennae are 36-segmented, and the flagellar segments
26 PBOCEEDINGS OF THE NATIONAL, MUSEUM vol. 67longer than in the female; on the basal half the antennae are yel-lowish, on the apical half blackish.Type.?Cat. No. 26660, U.S.N.M.Type-locality.?Charleston, Missouri.Host.?Sphenophorus callosus Olivier.Described from three specimens reared by Bagby and Satter-thwaite, August 16 to 25, 1917 under Webster No. 17835.
4. MICROBRACON GELECHIAE (Ashmead)Fig. 23Bracon gelechiae Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1889 (1888), p. 623.Bracon notaticeps Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1S89 (18S8) p. 624.Bracon. species Riley and Howard, Insect Life, vol. 2, 1890. p. 349.Habrobracon gelechiae Johnson, Ent. News, vol. 6, 1895, p. 324.Bracon, species Johannsen and Patch, Bull. 195, Maine Agr. Exp. Sta., 1912,p. 243.Habrobracon johannscni Viereck, Proc. U. S. Nat. Mus., vol. 42, 1913, p. 622.Habrobracon tetralophae Viereck, Proc. U. S. Nat. Mus., vol. 42, 1913, p. 623.Habrobracon gelechiae Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p. 106.Habrobracon johannseni Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p. 107.Habrobracon gelechiae Stearns, Journ. Econ. Ent., vol. 12, 1919, p. 348.Type.?The types of gelechiae, notaticeps, johannseni, and tetra-lophae are all in the United States National Museum, and respec-tively bear Type Catalogue Nos. 2919, 2920, 14720, and 14721.The female antennae normally are 22 to 26-segmented, althoughvery small specimens rarely have as few as 19 or 20 segments in theantennae; the 'antennae of the males are 22 to 27-segmented ; the flag-ellar segments are always much longer than broad, the first beingtwice as long as broad. The entire body is closely finely punctateand opaque or subopaque; the propodeum is without a distinct stubof a carina posteriorly; the color Varies greatly, but the head isnearly always black, with pale inner and superior orbital lines, andthe thorax is black; the first abscissa of the radius is almost invari-ably about as long as. the second, and the portion of cubitus betweenthe recurrent and the first intercubitus is fully as long as the re-current, and in small specimens longer.Distribution.?Throughout the United States.Flosts.?Gelechia, species (Ashmead) ; (Gelechia) Phthorimaeacinerella Murtfeldt (Ashmead) ; " oak-leaf skeletonizer " (Ash-mead) ; (Tetralopha) Wanda haptisiella Fernald (Viereck); " 4-spotted oak-leaf tyer;" {Gelechia) Aristotelia roseosuffusellaClemens (Riley and Howard) ; Canarsia hammondi Riley; Pyraustanubilalis Huebner; Laspeyresia molesta Busck (Stearns) ; Gelechiahibiscclla Busck; Phthorimaea operculella Zeller; Papaipema.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 27
species in pinks; Desmia funeralis Huebner; Pohjchrosis viteanaClemens ; and Archips argyrospila Walker.A large quantity of material which is in the United StatesNational Museum has been examined. This includes, in addition tothe types, specimens from the hosts listed above and from the follow-ing localities: Riley Co., Kansas; Franklin Co., Arkansas; Benton-ville, Arkansas (D. Isely). Watertown, Massachusetts (D. H.Craig) ; Peabody and Wakefield, Massachusetts (D. W. Jones andH. L. Parker); Cedar Point, Maryland; Oswego, New York;Whitesburg, New Jersey (H. B. Scammell) ; Leesburg, Virginia(L. A. Stearns) ; Rutherford, New Jersey (E. L. Dickerson) ; Fair-fax County, Virginia (J. F. Strauss) ; Norfolk, Virginia (F. H.O'Neill) ; Carlisle, Pennsylvania (P. R, Myers) ; Northeast, Penn-sylvania; Champaign, Illinois. Salineville, Ohio; Agricultural Col-lege, Michigan; Spokane, Washington (H. E. Newman); LosAngeles and El Monte, California (J. E. Graf). Most of this ma-terial was reared in the Bureau of Entomology under various Chit-tenden, Quaintance and Webster numbers. There is also a seriesof this species at the Gipsy Moth Laboratory, reared by R. T.Webber from an unknown tortricid on Monarda didyma, at MelroseHighlands, Massachusetts, under Gipsy Moth Laboratory No. 12164C21. . 5. MICROBRACON DIVERSICOLOR (Viereck)Habrobracon cliversicolor Viereck, Ent. News, vol. 32, 1921, p. 174.Type.?In the California Academy of Sciences.The type of this species has not been seen ; but from the originaldescription it appears to be gelechiae (Ashmead). However, I pre-fer to hold the name distinct until an opportunity is presented for anexamination of the type.Distribution.?Berkeley, California.Host.?Unknown.
6. MICROBRACON ERUCARUM (Cushman)Fig. 24Habrobracon erucarum Cushman, Proc. U. S. Nat. Mus., vol. 5S, 1920, p. 291.Type.?Cat. No. 22870, U.S.N.M.Near americanus (Ashmead) and gelechiae (Ashmead), but separa-ble from these by the characters given in the foregoing table. Usuallyentirely black except for very narrow, sometimes mostly obsolete,pale inner orbital lines, the venter of the abdomen, which is usuallyyellow, and usually more or less of the tibiae, which are somewhatbrownish ; the mesonotum, pleura, and propodeum are faintly closely
28 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67punctate: the scutellimi almost polished; the abdomen beyond thesecond tergite is smooth and shining, only faintly minutely reticulate
;
the radial cell is exceptionally small, measured along the wing mar-gin but little longer than the stigma; the first abscissa of radius isusually longer than the second; the only entire female antenna seenhas 22 segments, that of the male 25.Distribution.?"Utah; Colorado; Arizona.Host.?Euxoa, species.In addition to the type series the United States National Museumhas one specimen from Chiric Mountains, Arizona (H. G. Hubbard) ;and another from Colorado (C. F. Baker).
7. MICROBRACON AMKRICANUS (Ashmead)Trachyusa amcricana Ashmead, Bull. Colorado Biol. Assoc, 1, 1S90, p. IS.Habrobracon americanus Gahan, Proe. U. S. Nat. Mus., vol. 55, 1919, p. 123.Type.?-Cat, No. 13421, U.S.N.M.Although in his description Ashmead stated that he had but onespecimen, and that a male, the specimen in the National Museumlabeled " type " is a female. It agrees in every detail with Ashmead'sdescription and I have no doubt whatever that it is the specimenwhich he had before him. The face, frons, vertex, temples, even occi-put to some extent, and the entire thorax, minutely punctate orreticulate and opaque; antennae of type 23-segmented ; antennae oftwo other specimens, one female and one male, likewise 23-segmented,not tapering toward tip; the two basal flagellar segments twice aslong as broad; middle lobe of mesoscutum destitute of pubescencemedially; propodeum with a distinct median carina on its posteriorthird or half; abdomen beyond second tergite a little more stronglypunctate and less shining than in erucarum; radial cell short, theradius attaining wing margin much before the apex ; second abscissaof radius distinctly longer than first, and at least as long as first inter-cubitus ; the portion of cubitus between recurrent vein and first inter-cubitus decidedly shorter than recurrent; ovipositor sheaths project-ing much less than half the length of the abdomen beyond apex ofthe last dorsal segment ; head black except for narrow superior orbi-tal lines and a yellowish spot on cheeks adjoining the malar space;thorax and abdomen mostly or entirely black; coxae black; remainderof legs more or less black ; one male in the National Museum has theabdomen almost entirely red, and the antennae 22-segmented.Distribution.?Colorado.Host.?Unknown
.
In addition to the type there are three specimens, one female andtwo males, in the United States National Museum, all from Colorado,the female labeled " Colo. 2075," the two males " Colo. 413."
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 29
8. MICROBRACON CUSHMANI, new nameFig. 17Eabrobracon variabilis Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p. 103(not rrovancher).Type.?Cat. No. 18275, U.S.N.M.Separated from xanthonotus and platynotae by the antennae,which, especially in the female, are stout and taper toward the tip
;
and by the paler head and thorax. It is further distinguished fromplatynotae by the usually coarser longitudinal sculpture of the secondtergite, and from xanthonotus by the longer ovipositor sheaths, whichare a little more than half as long as the abdomen. Head and thoraxentirely finely granularly sculptured; antennae of female usually 19to 22-segmented ; of male, normally 21 to 25 segmented; malar spaceof female at least as long as the first flagellar segment; of male,nearly as long; wings a little dusky on basal half or more; secondabscissa of radius only a little or no longer than the first; last ab-scissa of radius as long as the last abscissa of cubitus, the latter notdistinctly twice the preceding abscissa of cubitus; the portion ofcubitus between recurrent and first intercubitus fully as long asrecurrent ; abdomen entirely or nearly entirely sculptured, the secondtergite coarsely so ; the oblique grooves on first tergite usually foveo-late; head, thorax, and abdomen usually mostly testaceous, thethorax often more or less fuscous ; legs mostly yellowish-brown.Distribution.?Occurs from Florida to Arizona and north to Illi-nois and Pennsylvania ; also found on the Virgin Islands.Hosts.?Canarsia hammondi Riley; Acrobasis nebuleUa Riley;Mineola indiginella Zeller; Mesocondyla gastralis Guenee; Enar-monia prunivora Walsh.Represented in the National Museum by considerable materialfrom the above-named hosts and from the following localities : Cham-paign, Illinois; Brownsville, Texas (Bridwell) ; Tucson, Arizona;Siloam Springs, Arkansas (S. W. Foster) ; Bentonville, Arkansas(D. Isely) ; Anderson, Missouri (F. L. Wellman and D. Isely) ; Kirk-wood, Missouri; Thomasville, Georgia; Monticello, Florida (J. B.Gill) ; and St. Croix, Virgin Islands. Most of this material wasreared in the Bureau of Entomology under Quaintance Nos. 5083,9160, 16459, 16487, 20730.
9. MICROBRACON PLATYNOTAE (Cushman)Habrobracon platynotae Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p. 104.Type.?Cat. No. 18276, U.S.N.M.Distinguished from cushm,ani as noted under that species; fromxanthonotus it differs especially by the characters given in the key;from gelechiae, which it very closely resembles in general appearance
30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67and in the length of ovipositor, it can be separated by the broader,foveolate suturiform articulation, the presence of a median area onthe second tergite set off by Short longitudinal furrows, and by theusually more coarsely granular sculpture of the abdomen. Antennaeof female usually 22 to 25 segmented, of the male 24 to 27 segmented
;
first flagellar segment twice as long as thick; head and thorax en-tirely finely granular; first abscissa of radius usually as long as thesecond ; the part of cubitus between recurrent and intercubitus longerthan the recurrent ; propocleum without a distinct median carina pos-teriorly ; head and thorax mostly black ; abdomen usually testaceous,except at base.Distribution.?Hollywood, California ; Durango, Mexico.Hosts.?Platynota, species ; Pectinophora gossypiella Saunders.In addition to the types the National Museum has a small series ofspecimens reared from the pink bollworm, at Tlahualilo and Lirdo,Durango, Mexico, by A. C. Johnson and N. B. McKinney.
10. MICROBRACON XANTHONOTUS (Ashmead)Fig. 26Bracon xanthonotus Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1SS9 (1888),p. 618.Habrobracon hopkinsi Viereck, Proe. U. S. Nat. Mus., vol. 38, 1910, p. 3S0.Habrobracon mali Viereck, Proc. U. S. Nat. Mus., vol. 44, 1913, p. 641.Habrobracon xanthonotus Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p.105.7^.?Cat. No. 14757, U.S.N.M. The types of hopkinsi (Cat.No. 12284) and mali (Cat. No. 15331) are also in the NationalMuseum.A thorough study of the types of xanthonotus, hopkinsi, and malican leave no doubt that all, as Cushman suggested, belong to thesame species. The characters upon which they were originally sepa-rated are all extremely variable. Some series exhibit practically allintergradations. The head and thorax are finely punctate or minu-tely granular ; the antennae are slender, and in the female normally23 to 27-segmented, in the male usually 25 to 28-segmented ; the firstflagellar segment is more than twice as long as thick, in the malenearly three times as long as thick ; malar space in female as long asfirst segment of flagellum, but considerably shorter in the male ; sec-ond abscissa of radius nearly always a little longer than the first;third abscissa of radius going very nearly to extreme apex of wingand as long as last abscissa of cubitus; the part of cubitus betweenrecurrent and first intercubitus nearly always a little shorter thanthe recurrent, apparently as long as recurrent in some small males;abdomen usually strongly sculptured, the second tergite and base ofthird usually longitudinally rugulose; the oblique grooves on first
art. 8 REVISION OP THE GENUS MICROBEACON MUESEBECK 31tergite coarsely foveolate, the apex of this tergite commonly rugose;second tergite nearly always with a median basal area set off bylongitudinal foveolate furrows; ovipositor sheaths distinctly lessthan half the length of the abdomen ; head and thorax usually black,more or less marked with yellow or red; abdomen varying frommostly testaceous to entirely black; legs varying from mostly black-ish to testaceous.Distribution.?California; Washington; Virginia; Minnesota;New Hampshire.Hosts.?Notolophus oslari Barnes; Malacosoma pluvialis Dyar;M. constricta Packard.The foregoing discussion and characterization are based on thetypes of xanthonotus, mali, and hopkinsi, and on considerable addi-tional material in the United States National Museum. This ma-terial includes series reared from Malacosoma pluvialis, at Pullman,Washington, under Washington Experiment Station No. 025; fromM. constricta, at Sacramento, California, under Bureau of Entomo-logy No. 2747 ; and from an unknown lepidopterous larva, at Vienna,Virginia, under Quaintance No. 7863 (R. A. Cushman). There arealso collected specimens from Santa Cruz Mountains, Yosemite,Summerdale and Alameda, California; Durham, New Hampshire(Weed and Fiske) ; and St. Anthony Park, Minnesota.
11. MICROBRACON HEBETOR (Say)Bracon hebetor Say, Bost. Jour. Nat. Hist, vol. 1, 1S36, p. 252.Bracon dorsator Say, Bost. Jour. Nat. Hist., vol. 1, 1S36, p. 253.Bracon brevicornis Kikby, Trans. Ent. Soc. Loud., 1S84, p. xxxi.
?
Marshall,Trans. Ent. Soc. Lond., 1885, p. 24, pi. 1, fig. la and b.Bracon juglandis Ashmead, Proc. U. S. Nat. Mus., vol. 11, 18S9 (1SSS), p. 621.Habrobracon liebctor Johnson, Ent. News, vol. 6, 1S95, p. 324.Bracon (Habrobracon) honestor Riley and Howard, Ins. Life, vol. 7, 1895,p. 42S. Misprint for hebetor, corrected in general index.Habrobracon beneficientior Viereck, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 1S2.Habrobracon brevicornis Cushman, Proc. Ent. Soc. Wash., vol. 16, 1914, p.101.?Whiting, Biol. Bull. 34, 1918, p. 350.Habrobracon juglandis Cushman, Proc. Ent. Soc. Wash., vol. 24, 1922, p. 213.Type.?The types of hebetor Say and dorsator Say have been lost
;
that of juglandis Ashmead and that of beneficientior Viereck are inthe United States National Museum, the former bearing type cata-logue No. 2913, the latter, No. 13494.This species is exceedingly close to brevicornis (Wesmael), andthe two have been much confused in literature. Cushman (1922)cleared up this matter, calling attention to the difference in habit inthe two species, and pointing out some morphological differences,although he did not regard juglandis Ashmead as identical withhebetor Say. It appears, after a careful consideration of Say's
32 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67description of hebetor, that there can be no reasonable doubt thatSay and Ashmead were dealing with the same species. In fact,Ashmead determined some specimens of this species in the NationalMuseum as hebetor Say, although failing to recognize the identityof juglandis with this material. The combination of charactersascribed to hebetor by Say is found nowhere else in the Braconidae,and after allowing for the wide range of variation occurring in thespecies, will be found to agree nicely with juglandis. Bracon dor-sator Say is also, without question, this species; and a study of thetype of Habrobracon beneftcientior Viereck shows this species, too,to be identical with hebetor Say. References in literature to Braconor Habrobracon brevicornis, hebetor or juglandis as parasites of theMediterranean flour moth, Ephestia kuehniella, of the meal moth,Plodia interpunctella, or of the bee-moth, Galleria mellonella, con-cern this species.The females of hebetor are readily distinguished from those ofbrevicornis by the antennae, which are 13 to 15-segmented in theformer, and 17 to 19-segmented in the latter. The males of the twospecies are much more difficult to distinguish, but the charactersmentioned in the key will nearly always separate them. The abdo-men in hebetor is almost invariably somewhat smoother, with thepunctures less distinct, than in brevicornis. In color this species isexceedingly inconstant.Distribution.?Apparently occurs throughout the world, wher-ever its hosts, particularly the flour and meal moths, are present.Hosts.?Ephestia kuehniella Zeller; E. elutella Huebner; E.cahiritella Zeller; Plodia interpunctella Huebner; Galleria mellon-ella Linnaeus; Vitula edmansii Packard; Sitotroga cerealellaOlivier.The above discussion is based on abundant reared and collectedmaterial in the United States National Museum. Series from thefollowing hosts and localities are contained in this collection;Ephestia kuehniella?Reno, Nevada (S. B. Doten) ; San Fran-cisco, California (G. Compere and W. G. Johnson) ; Vitula ed-mansii in Bombus nests?Riverton, New Jersej'' and Champaign,Illinois (T. H. Frison) ; Sitotroga cerealella?Potchefstroom, S.Africa (W. F. Schepp) ; Galleria mellonella?Fillmore, California(J. F. Mclntyre) ; Plodia interpunctella?Jamaica Plain, Massa-chusetts (J. G. Jack) ; also specimens from cone galls on Salixlongifolia, Reno, Nevada (G. G. Schweiss) ; a series from seeds ofProsopis juliflora, Cairo, Egypt (H. Morrison) ; another from alarva infesting soy beans, Mayaguez, Porto Rico (W. A. Mace) ;6 specimens labeled "on ship with cocoa beans, O. K. Courtney; 1 'a series reared from infested corn, Santo Domingo, West Indies
art. 8 REVISION OF THE GENUS MICROBRACON?MUESEBECK 33(W. V. Tower) ; 8 specimens from a lepidopterous larva in seeds ofCanarium indicum, Buitenzorg, Java (L. L. Spessard) ; 12, labeled
'? Grewia cana, Transvaal, S. Africa;" 2 from St. Petersburg, Rus-sia (J. Schreiner) ; 1 from Charroux, France (Oberthur) ; 4 from aseed storehouse, Yates City, Illinois (W. S. Abbott) ; other speci-mens from Jacksonville, Florida; Morgantown, West Virginia;Agricultural College, Michigan, and Milton, Massachusetts; anda series of several hundred individuals bred by P. W. Whitingin connection with genetic studies on this species at the Universityof Pennsylvania.
12. MICROBRACON BREVICORNIS (Wesmael)Fig. 19Bracon brevicornis Wesmael, Nouv. Mem. Acad. Sci. Bruxelles, vol. 11, 1338,p. 23, fig. 2.
?
Brischke, Schr. Naturf. Ges. Danzig, ser. 2, vol. 4, 1SS2.p. 135.Eabrobracpn brevicornis Cushman, Proc. Ent. Soe. Wash., vol. 24, 1922. p. 122.Type.?Probabhy in the Brussels Academy of Science.The similarity of this species to hebetor (Say) and the confusionof the two species in literature are discussed under hebetor.Distribution.?This species apparently occurs throughout Europe.It has recently been introduced into Massachusetts from France, asa parasite of the imported European Corn-Borer, Pyrausta nubilalisHuebner. While it is too early to say whether or not it has becomedefinitely established in the United States, it is included in this paperbecause of the probability that it will eventually establish itself here.Hosts.?Dioryctria abietetta Zinck (Brischke) ; Pyrausta nubilalisHuebner.The following material has been examined : a series of 16 specimensin the National Museum, reared from Pyrausta nubilalis at Auch,Gers, France and Hyeres, Var, France, by W. R. Thompson, in theUnited States Bureau of Entomology, under Webster No. 16490;collected specimens in the National Museum from Saxony and Berlin,Germany, and La Chatre, France; and several hundred specimensbred at the Corn Borer Laboratoiy of the Bureau of Entomology, atArlington, Massachusetts, in reproduction work with this species.
13. MICROBRACON SCANTICORUM ViereckMicrobracon scanticorum Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916) pp. 205, 207.Type.?In the Connecticut Agricultural Experiment Station, atNew Haven.The following notes were made on an examination of the t}'pe andare given here because the species was originally poorly charac-terized: Antennae broken at 27th segment, first flagellar segment12053?25 3
34 PKOCEEDINGS OF THE NATIONAL, MUSEUM vol. C7much longer than the second ; malar space shorter than first flagellarsegment ; transverse diameter of opening between clypeus and mandi-bles much greater than the distance from the opening to the eyes andabout twice the malar space ; face minutely sculptured ; frons smoothand polished; thorax smooth and polished; parapsidal furrowssparsely hairy; propodeum polished with a stub of a median ridgeat apex, and a more or less distinct median roughened groove fromthe anterior end of this stub to the base of propodeum; propodeumalso provided with two lateral oblique foveolate grooves; radiusarising distinctly beyond middle of stigma; first abscissa of radiusless than one-third the length of the second abscissa and less thanhalf the first intercubitus ; radius attaining wing margin much beforeapex of wing; the portion of cubitus between recurrent and first in-tercubitus very short, the recurrent very nearly interstitial with firstintercubitus; first abdominal tergite finely sculptured apically andlaterally ; second tergite very minutley granular with a more stronglyroughened area medially ; following tergites very delicately punctate,the apical tergites very faintly or indistinctly so ; suturiform articu-lation very fine, arcuate, not distinctty foveolate; ovipositor sheathsjust about as long as the abdomen. Mostly yellowish; dorsum ofthorax more or less blackish ; propodeum and first abdominal tergiteblackish ; wings slightly fuliginous ; legs, including all coxae, yellow.Distribution.?West Thompson, Connecticut; Algonquin, Illinois.Host.?Unknown.Known only from the type, and one additional specimen, a homo-type determined by Muesebeck, labeled "Algonquin, 111. 5-16-96,No. 6603." The latter is in the United States National Museum.
14. MICROBRACON PYRALJDIPHAGUS, new speciesResembles scanticorum in that the radius arises from beyond themiddle of a rather long, narrow, non-angular stigma; in the veryshort first abscissa of radius, and the rather short radial cell; itdiffers from that species particularly as noted in the key.Female.?Length, 3.3 mm. Head transverse but rather thickantero-posteriorly at insertion of antennae; face finely granularand opaque; frons smooth and polished; antennae 36-segmented,slightly shorter than the body; first flagellar segment about twiceas long as thick; mesonotum and mesopleura smooth and polished;parapsidal grooves sparsely pubescent, more thickly so posteriorly;propodeum finely rugulose over most of its surface and providedwith a distinct median longitudinal carina ; metapleura finely sculp-tured; stigma rather narrow, not angular; the radius arising dis-tinctly beyond the middle of stigma; radial cell short, the radiusattaining wing margin much before apex of wing; first abscissa ofradius short, decidedly less than half the first intercubitus and
art. S REVISION OF THE GENUS MICROBRACON MUESEBECK 35hardly one-third the second abscissa of radius; posterior femorastout, about three times as long as broad; first abdominal tergitestrongly rugulose, the sculpture occurring on the middle of the plateas well as laterally ; second tergite about as long as third, granularlyrugulose, its posterior margin straight; third tergite granular; thefourth and fifth somewhat granular but less strongly than third;ovipositor sheaths about as long as that part of the dorsum of ab-domen bej^ond second tergite. Reddish brown; head entirely black;mesonotal lobes, metanotum, propodeum and pectus blackish; wingsentirely a little fuscous; legs ferruginous, the apex of posterior tibiaeand the posterior tarsi dusky; abdomen reddish-brown, the firsttergite somewhat infuscated.Type.?Cat Xo. 26064, U.S.N.M.Type-locality.?Crowley, Louisiana.Described from a single specimen labeled "Parasite of Chilo andDiatraea, Crowley, La., 9-8-23, J. W. Ingram."
15. MICROBRACON GASTROIDEAE (Ashmead)Fig. 1Bracon gastroideae Ashmead, Proc. U. S. Nat. Mus., vol. 11, 18S9 (1888), p. 617.Type.?Cat. No. 2904, U.S.N.M.The opening betwen clypeus and mandibles is enormous, its trans-verse diameter being greater than the length of the face belowantennae; female antennae usually 24 to 27-segmented, the basalflagellar segment twice as long as broad, all the following somewhatlonger than broad; thorax smooth and polished; parapsidal groovesvery sparsely hairy ; propodeum with a nearly complete median lon-gitudinal carina, otherwise mostly smooth and polished; firstabscissa of radius usually not more than half the first intercubitusand less than half the second abscissa of radius; radial cell rathershort, the radius attaining wing margin distinctly before apex ofwing; tarsi stout, the posterior tarsi shorter than their tibiae, inthe female much shorter; the last segment of posterior tarsi verylarge, broadening strongly toward apex; much longer than thesecond segment and more than twice the fourth; in the female atleast, and usually in the male, the posterior tibiae three times aslong as the metatarsi; abdomen smooth and polished, the secondtergite sometimes a little longitudinally sculptured at base; ovi-positor sheaths scarcely as long as the first abdominal tergite. Headand thorax black; wings strongly infuscated; coxae black; usuallybase of femora and more or less of tibiae and tarsi blackish orfuscous; abdomen usually red with first tergite and a median spoton second black, altKough sometimes abdomen is entirely black.
36 PROCEEDINGS OF THE NATIONAL, MUSEUM vou 07Distribution.?Ohio; Michigan; Illinois; Massachusetts; Canada.Host.?Gastroidea cyanea Melsh.In addition to the type which is from Columbus, Ohio, the Na-tional Museum has specimens from Agricultural College, Michigan
;
Algonquin, Illinois; and Canada (C. F. Baker). There is also aspecimen, taken at Arlington, Massachusetts, in the collection of theCorn Borer Laboratory of the Bureau of Entomology at Arlington.
16. MICROBRACON BRACHYURUS (Ashmead;Bracon brachyurus Ashmead, Can. Ent., vol. 23, 1891, p. 1.Type.?Cat. No. 6853, U.S.N.M.Very similar to gastroideae, with which it agrees in the large open-ing between clypeus and mandibles, the presence of a median carinaon the propodeum, the wing venation, the short posterior tarsi, andthe very short ovipositor. It can be readily distinguished, however,by the characters given in the key. The ocelli are exceptionallysmall, the ocell-ocular line being four times the diameter of anocellus; the propodeum more or less finely rugulose; head andthorax black; abdomen usually entirely black: posterior coxae black;the two anterior pairs usually yellowish.Distribution.?Ottawa, Canada.Host.?Unknown.The United States National Museum has, in addition to the type,one other specimen, also from Ottawa, Canada.
17. MICROBRACON MELANASPIS (Ashmead,Fig. 5Bracon melanaspis Ashmead, Can. Ent., vol. 23, 1S91, i>. 1.Type.?Cut. No. 6863, U.S.N.M.Distinguished especially by the character of the second tergite asdescribed in the key. Frons polished; antennae longer than thebody; malar space in the female fully as long as the distance be-tween clypeal foveae ; parapsidal grooves rather conspicuously hairy,especially posteriorly; propodeum completely polished without asuggestion of a stub of a median carina at apex; first abscissa ofradius about three-fourths the first intercubitus and more than halfthe second abscissa of radius; posterior legs slender; abdomen com-pletely polished; the chitinized plate of the first tergite slender,parallel-sided; the lateral membranous margins of first tergitebroad; second tergite with weakly chitinized areas laterally oppositethe membranous margins of the first tergite; the following tergiteswith the apical margins membranous; suturiform articulation rep-resented by a fine impressed arcuate line, without a suggestion offoveolae; ovipositor sheaths scarcely half as long as the abdomen.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 37Black; head and thorax black; abdomen black, the membranousparts of the dorsum paler; legs usually blackish.Distribution.?Ottawa, Canada ; S. W. Harbor, Maine.Host.?Unknown.Known only from the type, and one other fine female specimenwhich is in the Boston Societ}^ of Natural History and was takenby C. W. Johnson at S. W. Harbor, Maine. July 13, 1918.
18. MICROBRACON JUNCICOLA (Ashmead)Bracon jtmcicola Abhmead, Proc. U. S. Nat. Mus., vol. 11, 18S9 (18SS), p. 020.Microbracon sebequanash Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 204 and 206.Type.?Cat. No. 2911, U.S.N.M. The type of sebequanash is in theConnecticut Agricultural Experiment Station at New Haven.Exceedingly like melanaspis in structure, but is probably a dis-tinct species. The few specimens that have been seen differ mark-edly in color from the t}-pe of melanaspis, being mostly yellow.Face yellow ; thorax and abdomen largely yellow ; legs, including allcoxae, yellow ; malar space about as in melanaspis; antennae likewiseare similar, being slender and usually 25 to 30-segmented ; parapsidalgrooves rather strongly pubescent posteriorly; propodeum com-pletely polished with not even an indication of a stub of a medianridge at apex; suturiform articulation exceedingly delicate, merelya fine impressed line; as in melanaspis, the apical margins of thetergites beyond the second are usually more or less membranous;ovipositor sheaths hardly half as long as the abdomen.Distribution.?From Missouri to West Virginia and Connecticut.Hosts.?Evidently species of Coleophora (Ashmead).The above notes are based on the types of juncicola and sebequa-nash? and on several other specimens in the National Museum fromthe following localities: Highspire, Pennsylvania; Ohio; WestVirginia; Algonquin, Illinois.
19. MICROBRACON POLITIVENTRIS (Cuskman)Habrobracon politiventris Cushman, Proc. U. S. Nat. Mus., vol. 55, 1919,p. 517.Type?Cat. No. 21639, U.S.N.M.Very similar to pygmaeus, which it very closely resembles in size,color, habitus, malar space, the sculptured frons and vertex, thepubescence of the parapsidal furrows, the color and venation ofthe wings, and in other points. It is often difficult to distinguishfrom that species.Malar space in the female usually fully as long as the transversediameter of the opening between clypeus and mandibles; vertex and
38 PROCEEDINGS OP THE NATIONAL, MUSEUM vol.67frons closely punctate and opaque; antennae usually 21 to 25-seg-mented; thorax stout; parapsidal furrows completely stronglyhairy; the surface of the middle lobe of mesoscutum with scatter-ing pubescence anteriorly; propodeum usually faintly minutelyreticulate over most of its surface; metapleura with long pubsecence;second abscissa of radius nearly always less than twice the first, andsometimes only half the third ; the portion of cubitus between recur-rent and first intercubitus usually about half the first intercubitus
;
abdomen rather broad, smooth and polished; the second tergiteusually considerably longer than the third, polished, and providedwith two short oblique foveolate furrows medially ; ovipositor sheathsnot or scarcely half as long as the abdomen. Black; head black,with pale yellow orbital lines; thorax black; wings dusky; coxaeblack or blackish; femora usually yellow; tibiae and tarsi mostlyblackish; abdomen black, usually bright yellow laterally.Distribution.?From Maine to Virginia, and west to Iowa.Flosts.?Polychrosis viteana Clemens; Eulia triferana Walker;Archips 'paralella Kobinson or Pandemis lamprosana Robinson. Theparasite is gregarious, several individuals developing on a single host.In addition to the types the collection of the United StatesNational Museum contains two specimens reared from Euliatriferana, at Washington, District of Columbia, under ChittendenNo. 6099 02 ; a series reared from a lepidopterous larva on wildcherry, by R. A. Cushman, at Vienna, Virginia, under QuaintanceNo. 7719; a specimen labeled "la. Exp. Sta., Plum curculio"; andone specimen from Hanover, New Hampshire (C. M. Weed). Atthe Gipsy Moth Laboratory there is a series reared by J. V. Schaff-ner from a collection of two different species of Tortricidae, Archipsparalexia and Pandemis lamprosana taken at Melrose Highlands,Massachusetts; one or the other of these was the host. The collec-tion of the Boston Society of Natural History has a specimencollected at Liberty, Maine, by J. A. Cushman.
20. MICROBRACON PYGMAEUS (Provancher)Figs. 3, 15Bracon pygmacus Provancher, Natural. Canad., vol. 12, 18S0, p. 144.Bracon junci Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1889 (1SS8), p. 619.Bracon trifolii Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1SS9 (18S8), p. 622.Bracon kansensis Viereck, Trans. Kans. Acad. Sci., vol. 19, 1905 (1903-04),p. 2G8.Microbracon coleophorae Rohwer, Proc. U. S. Nat. Mus., vol. 49, 1915, p. 231.Microbracon massasoit Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 205 and 207.Type.?Yellow label 555, Museum of Public Instruction, Parlia-ment Building, Quebec, Canada. The types of junci (Cat. No. 2910)
aet. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 39
trifolii (Cat. No. 2916) and coleophorae (Cat. No. 18180) are in theUnited States National Museum ; that of hansensis is in the KansasUniversity collection; and that of massasoit is in the collection of theState Agricultural Experiment Station, at New Haven, Connecticut.Very similar to the preceding as pointed out in the discussion un-der that species; but the characters given in the table to species willserve to distinguish between the two.Malar space in the female as long as the transverse diameter ofthe opening between clypeus and mandibles; frons and vertex closelypunctate and opaque; antennae usually 24 to 29-segmented ; thoraxstout; mesoscutum with long and rather thick pubescence along theanterior lateral margins and in the parapsidal grooves; metapleurathickly pubescent ; propodeum smooth and shining, not minutely reti-culate; second abscissa of radius rarely distinctly twice as long asthe first ; posterior tibiae and tarsi slender ; plate of first abdominaltergite usually a little roughened laterally and across the apex; sec-ond tergite usually more or less finely granularly sculptured, with-out oblique foveolate furrows medially toward base; very rarelythird and fourth tergites granular, usually smooth and shining; ovi-positor sheaths projecting about half the length of the abdomen.Head black with contrasting yellow inner orbital lines; thoraxmostly black, sometimes ferruginous behind the middle lobe of meso-scutum and on the scutellum ; wings dusky on basal two-thirds ; coxaeusually black, although sometimes mostly testaceous ; posterior tibiaeat apex and their tarsi fuscous ; abdomen often mostly reddish testa-ceous with the first tergite and the apical tergites black, but this isvariable, the entire abdomen sometimes being black.Distribution.?Very widely distributed. Occurs from Canada toFlorida and westward to California.Hosts.?Coleophora leucochrysella Clemens (Eohwer) ; C. volckeiHeinrich; and various undetermined species of Coleophora.In addition to the types of pygmaeus, junci, trifolii, coleophorae,and massasoit, I have seen the following material: In the NationalMuseum, a series reared from Coleophora volckei at Washington,District of Columbia, by E. E. Selkregg, under Quaintance No. 7890 ;another series reared from the same host, at Watsonville, Californiaby W. H. Volck ; several specimens from a species of Coleophora onAmaranthus at Washington, District of Columbia; and collectedspecimens from Cedar Point, Maryland ; Jacksonville, Florida ; Al-gonquin, Illinois; Agricultural College, Maryland; Onaga and RileyCo., Kansas; Vienna, Virginia (E, A. Cushman) ; Ames, Iowa (C.W. Mally) ; Indiana; Colorado. The Boston Society of NaturalHistory has one specimen taken by C. W. Johnson at S. W. Harbor,
40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 07Maine. At the Gipsy Moth Laboratory there is a specimen rearedfrom a species of Coleopkora taken at Wilmington, Massachusetts.The original description of kansensis and notes on the type by A. B.Gahan leave no doubt that this species is pygmaeus.
21. MICROBRACON CONNECTICUTORUM ViereckMicrooracon connecticutorum Viereck, Bull. 22, Conn. Geol. and Nat. Hist.Survey, 1917 (1916), pp. 205 and 209.Type.?In the State Agricultural Experiment Station at New-Haven, Connecticut.Resembles nuperus and curtus in having the head thin antero-pos-teriorly, in the smooth and polished frons, the completely polishedpropodeum and the smooth abdomen, but differs especially in themuch shorter ovipositor sheaths.Following are notes made on an examination of the type: Face,frons and vertex smooth and shining; malar space as long as thetransverse diameter of the opening between clypeus and mandibles;antennae missing; thorax stout; parapsidal grooves posteriorly, andthe metapleura, thickty pubescent; propodeum completely smoothand polished, without a suggestion of a stub of a median ridge atapex ; first abscissa of radius nearly as long as the first intercubitus,the second abscissa hardly one and one-half times as long as the first
;
the portion of cubitus between recurrent vein and first intercubitusnearly as long as the recurrent; abdomen smooth and polished, witha few extremely faint punctures or striae on second tergite; theplate of the first tergite completely polished; ovipositor sheathsnot projecting half the length of the abdomen.Distribution.?New Haven, Connecticut.Host.?Unknown.Known only from the type.
22. MICROBRACON PSILOCORSI ViereckMicrobracon psilocorsi Viekeck, Proc. U. S. Nat. Mus., vol. 42, 1912, p. 143.Type.?Oat. No. 14317, U.S.N.M.Resembles politiventris in habitus, and in some details, but is eas-ily distinguished. Head thick antero-posteriorly at insertion of an-tennae; face strongly receding; eyes very short, broad-oval; fronspolished; antennae usually 30 to 33-segmented, tapering distinctlytoward tip; the ten or twelve basal segments of flagellum moreor less subequal ; thorax stout, rather thickly pubescent in the parap-sidal grooves and on metapleura; scutellum large; radius arisingmuch before middle of stigma and going to extreme apex of wing;second abscissa of radius much more than twice the first; the partof cubitus between recurrent and first intercubitus only half thelength of recurrent; measured along cubitus the third cubital cellnot distinctly as long as the second ; propodeum smooth and polished
;
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 41abdomen entirely smooth and polished; second tergite with a basalmedian area set off by short oblique foveolate furrows, and some-times with less distinct longitudinal furrows laterally; second ter-gite about as long as the third ; ovipositor sheaths less than half aslong as the abdomen. Mostly yellowish; face yellow; frons andvertex sometimes piceous to blackish; mesonotal lobes, lateral facesof scutellum, metathorax, propodeum, and pectus more or lesspiceous, sometimes thorax mostly blackish except on the pleura;wings infumated on basal two-thirds; legs yellow, the posteriorcoxae sometimes infuscated; abdomen usually yellowish, with firsttergite, and the third and following medially, more or less blackish.Distribution.?Cuero, Texas.Host.? (Psilocorsis) Cryptolechia, species.Known only from the type series.
23. MICROBRACON MEROMYZAE (Gahan)Bracon (Tropidobracon) meromyzae Gahan, Proc. U. S. Nat. Mus., vol. 48,1913, p. 432.Type.?Cat. No. 16350, U.S.N.M.Head rather thick antero-posteriorly, not broad; face and fronssmooth and polished; antennae slender, usually 28 to 32-segmented,as long as the body in the female, longer in the male; thorax slender,polished; parapsidal grooves sparsely hairy; propodeum polished,usually with a nearly complete median longitudinal carina; radiusgoing practically to extreme apex of wing; second abscissa of radiustwice as long as the first; the chitinized plate of first tergite slender,rugose laterally and at apex ; second and third tergites finely granu-lar, shining; rarely the fourth tergite faintly granular in part; re-mainder of dorsum of abdomen smooth and polished; ovipositorsheaths less than half the length of abdomen. Head wholly black;thorax black, pectus sometimes more or less yellowish; wings veryslightly dusky; legs, including all coxae, bright yellow; abdomenmore or less blackish above, second and third tergites mostly yellow.Distribution.?South Dakota.Host.?Meromyza americana Fitch.Known only from the types, and two additional specimens, fromBrookings, South Dakota, in the United States National Museum.
24. MICROBRACON NIGRIDORSUM (Ashmead)Bracon nigridorsum Ashmead, Can. Ent., vol. 23, 1891, p. 2.Type.?Oat. No. 6862, U.S.N.M.Head rather thick antero-posteriorly, the face strongly receding;temples broad; eyes short, broad-oval; face and frons smooth andpolished; antennae slender, 35-segmented in the type, the first flagel-12053?25 i
42 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67lar segment twice as long as broad, all the following one and one-half times as long as broad, thorax stout, smooth and polished;parapsidal grooves sparsely hairy ; propodeum smooth and polished
;
first abdominal tergite somewhat roughened laterally and at apex;second tergite with a little very faint sculpture medially ; suturiformarticulation very fine; third and following tergites completelysmooth and polished; ovipostor sheaths projecting hardly half thelength of the abdomen. Head black, with very narrow ferruginousinner and superior orbital lines; thorax black; wings hyaline; legs,including all coxae, bright yellow; abdomen in type honey-yellow,with first tergite and transverse median spots on second, third andfourth tergites, black.Distribution.?Ottawa, Canada.Host.?Unknown.The type is the only specimen known to me.
25. MICROBRACON ASHMEADI, new nameMacrodi/ctium politum Ashmead, Proc. Wash. Acad. Sci., vol. 4, 1902, p. 252
;
[not (Bracon politus Provancher) =Microhracon nuperus (Cresson).]Type.?
?at. No. 5712, U.S.N.M.Head not thin antero-posteriorly, face receding; eyes broad; faceand frons smooth and polished ; opening between clypeus and mandi-bles small, its transverse diameter not greater than the distance fromthe opening to the eye ; thorax long and slender, fully twice as longas its greatest depth ; parapsidal grooves sparsely hairy ; metanotumlonger than usual ; propodeum long, with a stub of a median carinaat apex and a few short ridges diverging from this; stigma large,long; both second and third cubital cells long; last abscissa of radiuslonger than first and second abscissae combined; posterior tarsirather stout, the apical tarsal segment large and fully as long as thesecond; abdomen long and narrow; first tergite slender, broadeninggradually toward apex, and a little rugulose laterally and at apex;second tergite with faint striae medially; suturiform articulationvery delicate; remainder of tergum polished; hypopygium not at-taining apex of last dorsal segment ; ovipositor sheaths less than halfas long as the abdomen. Head, thorax and abdomen entirely blackwings a little infuscated; legs, including coxae, black; tibiae yellowon the basal half.Distribution.?Alaska.Host.?Unknown.Known only from the unique type.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECTC 43
26. MICROBRACON UNCAS ViereckMicrobracon uncus Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey, 1917(1916), pp. 206 and 20S.Type.?In the State Agricultural Experiment Station, at NewHaven, Connecticut.Exceedingly similar to ashmeadi, agreeing in habitus, in the smallsize of the opening between clypeus and mandibles, in the smoothfrons, in the form, sculpture and pubescence of thorax ; in the vena-tion of the wings; in the stout tarsi and large last tarsal segment;in size, shape and sculpture of the abdomen ; in the hypopygium notattaining apex of last dorsal abdominal segment; the length of theovipositor sheaths, and the general color. Appears to differ only inthe color of the legs, which are yellow, with the posterior coxae a lit-tle blackish at extreme base. The propodeum has, in addition to theapical median carina, a slight median longitudinal elevation andadjoining fine sculpture at base.Distribution.?New Haven, Connecticut.Host.?Unknown.Known only from the type.
27. MICROBRACON ANGELESIUS (Provancher)Bracon angclcsius Provancher, Addit. faun. Canad. Hymen., 1S8S, p. 372.Bracon cecidomyiue Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1SS9 (1888), p. 616.Bracon euurae Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1889 (1888), p. 621.Type.?Yellow label 1486, Museum of Public Instruction, atQuebec, Canada; the head is broken off, but is mounted on one ofthe labels. The types of cecidomyiae (Cat. No. 2903) and euurae(Cat. No. 2914) are in the United States National Museum.Distinguished especially by the very slender antennae, the longovipositor, the entirely polished abdomen, hyaline wings, and colorof the body. Head rather thick antero-posteriorly ; face recedingrather strongly; antennae of the type, and those of the type ofeuurae, are broken at or beyond the middle ; the type of cecidomyiaehas 32-segmented antennae; in all three the first flagellar segmentis nearly three times as long as broad, and all the following seg-ments are fully twice as long as broad ; frons polished ; thorax pol-ished; parapsidal grooves very sparsely hairy anteriorly, moreclosely hairy behind; propodeum smooth and polished, with a shortstub of a median carina at apex ; anterior wings of type are missing
;
in the types of euurae and cecidomyiae the radial cell is large andlong, and the second abscissa of radius is not distinctly twice as longas the first; posterior femora slender; abdomen completely smoothand polished; ovipositor sheaths one and one-half times as long as
44 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.67the abdomen. Face yellow; vertex and occiput more or less piceous;thorax yellow, the pectus and the propodeum usually fuscous orblackish; wings perfectly clear hyaline; legs, including all coxae,bright yellow, the posterior tibiae at apex and their tarsi more orless infuscated ; abdomen yellow or yellowish-ferruginous with trans-verse fuscous or blackish bands on the second, third, and fourthtergites.Distribution.?California.Hosts.?Euura, species, which forms galls on Salix; and a ceci-domyid gall on Mimulus.Known only from the types of angelesius, cecidomyiae, and euurae.A thorough study of the three types clearly shows them to beconspecific. 28. MICROBRACON AURIPES (Provancher)Bracon auripes Provancheu, Addit. faun. Canad. Hymen., 1888, p. 372.Type.?Blue label 670, yellow label 1571, Museum of Public In-struction, at Quebec, Canada.Following are notes made upon an examination of the type : Headmissing; thorax slender, smooth and polished; radius going practi-cally to extreme apex of wing; second abscissa of radius more thantwice the first, the third longer than first and second combined; re-current vein more than twice as long as the portion of cubitus be-tween recurrent and first intercubitus ; first abdominal tergite slen-der, broadening gradually toward apex, with a finely foveolategroove just inside the lateral margins; second tergite longer thanthird, finely ruguloso-striate ; suturiform articulation very fine; re-mainder of abdomen highly polished ; ovipositor sheaths very nearlyas long as the abdomen. Thorax*-black with a large testaceous spotbehind middle lobe of mesoscutum, and with the propleura testace-ous; wings hyaline; legs, including all coxae, wholly yellow; abdo-men black above, with narrow yellow lateral margins and with abright j^ellow spot at the apex; venter mostl}?- yellowish. A homo-type and other specimens in the same series t>how the species to havea black, smooth and polished, evenly rounded head, with very slen-der antennae, which have all the flagellar segments more than twiceas long as thick, and are 27 to 32-segmented. The thorax is some-times entirely black.Distribution.?Ottawa, Canada ; Massachusetts.Hosts.?Lepidopterous larvae boring in various weeds, such asAmaranthus, Ambrosia, Xanthium, etc.In addition to the type, I have seen a large series of specimensreared from such plants as indicated above, at the Corn Borer Labo-ratory of the Bureau of Entomology, at Arlington, Massachusetts.
art. 8 REVISION OF THE GENUS MICROBRACON?^MUESEBECK 45This material is from Watertown, Maiden, Melrose, Stoneham, Sau-gus, and Wakefield, Massachusetts. One of these specimens wascompared with the type, designated a homotype, and placed in theUnited States National Museum.
29. MICROBRACON RLDBECKIAE, new speciesFigs. 2, 22Female.?Length. 3.3 mm. Head rather thin, not prominent atinsertion of antennae, the face rather flat, not, or very slightly, re-ceding; eyes small; ocelli small; ocell-ocular line more three timesthe diameter of an ocellus; postocellar line about twice the diameterof an ocellus: opening between clypeus and mandibles large, itstransverse diameter nearly twice the length of malar space; face,frons, vertex, temples, smooth and polished; antennae 24-segmented,shorter than the body, basal flagellar segments the longest; thoraxstout, smooth, and polished; the parapsidal grooves sparsely hairy;propodeum entirely polished, without even a suggestion of a stubof a carina at apex; second abscissa of radius usually distinctly lessthan twice the first ; the third longer than the first and second com-bined and usually about twice as long as the second, which is butlittle longer than the first intercubitus ; the portion of cubitus be-tween recurrent and first intercubitus more than half as long as therecurrent; the last abscissa of cubitus considerably longer than thepreceding abscissa; legs slender; last segment of posterior tarsi notas long as the second ; abdomen a little longer than the thorax ; thechitinized plate of the first tergite nearly parallel-sided, angled atthe spiracles, smooth and polished, with two fine curved grooves con-verging toward the base ; second tergite transverse, with conspicuousmembranous areas laterally opposite the membranous margins alongthe first tergite. and with a slight tubercle at base and adjoining finestriae; third and following tergites smooth and polished; ovipositorsheaths distinctly longer than the entire body. Yellow; vertex ofhead and occiput more or less piceous; mesonotal lobes and propo-deum sometimes a little dusky; wings distinctly infuscated on basaltwo-thirds, nearly hyaline at apex; legs including all coxae yellow,the tibiae usually slightly dusky.Male.?Antennae 26-segmented. Essentially as in the female.Type.?Cat. No. 26662, U.S.N.M.Type-locality.?Mineral Wells. Texas.Host.?A larva living in the head of Rudbeckia amplex.Described from 20 female and 2 male specimens reared by C. R.Jones. The number of segments in the antennae in this series variesfrom 23 to. 26.
46 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67
30. MICROBRACON TENUICEPS, new speciesFig. 7Very similar in structure to rudbeckiae, but is almost completelyblack, has the second abdominal tergite wholly smooth and polished,and differs in numerous details ; also resembles nuperus, but differs asnoted in the key.Female.?Length, 3 mm. Head thin antero-posteriorly, scarcelythicker at insertion of antennae than at the clypeus, the face not orhardly receding; the frons almost vertical; face, frons, vertex, andtemples smooth and polished; eyes nearly twice as long as broad,faintly hairy; transverse diameter of opening between clypeus andmandibles not twice the length of the malar space; post-ocellar Huenot distinctly twice, the ocell-ocular line not distinctly three times,as long as the diameter of an ocellus; antennae 23-segmented, thebasal flagellar segment nearly three times as long as broad, thefollowing gradually decreasing in length, but most of them fullytwice as long as broad ; thorax rather stout, completely smooth andpolished ; parapsidal furrows sparsely hairy anteriorly, more thicklyso posteriorly ; propodeum entirely polished, without even a stub ofa median longitudinal ridge at apex; first abscissa of radius longerthan the recurrent vein ; second abscissa of radius much less than twicethe first, only half the third, and but very slightly longer than thefirst intercubitus ; radius attaining wing margin distinctly before theapex; last abscissa of cubitus a little longer than the preceding ab-scissa ; legs slender, the posterior femora at least four-fifths as long astheir tibiae ; abdomen about as long as the thorax, completely smoothand highly polished; the chitinized plate of first tergite broad, andwith two fine impressed curved lines converging toward base; sec-ond abdominal tergite with a small but conspicuous, more or less tri-angular, membranous area at either side joining the lateral membran-ous margins of the first tergite ; second tergite much shorter than thethird ; hypopygium attaining apex of last dorsal abdominal segment
;
ovipositor sheaths fully as long as the entire body. Black ; head andthorax wholly black; wings strongly infuscated; legs deep black,except the anterior femora at apex, their tibiae within, and themiddle and posterior tibiae at extreme base, where they are brownishabdomen black except the membranous margins along first tergite,the membranous areas in the basal lateral angles of the second, anda very small spot in the basal lateral angles of the third, which arebright yellow, contrasting strongly with the deep black of the re-mainder of the abdomen.Type.?Cat. No. 27142, U.S.N.M.Type-locality.?Chester, Virginia.Host.? f Phytonomus nigrirostris Fabricius.
aet. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 47Described from a fine single specimen taken by W. J. Schoene inconnection with studies of the clover weevil, Phytonomus nigrirostris.C. W. Johnson, of the Boston Society of Natural History, has severalfine specimens of this striking species, which were collected by himat Bar Harbor, Southwest Harbor, Salisbury Cove, and MountDesert, Maine; one small female in this collection has only 18 seg-ments in the antennae.
31. MICROBRACON NUPERUS (Cresson)Bracon nuperus Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 187, line 20.Bracon minimus Cresson, Trans. Amer, Ent. Soc, vol. 4, 1872, p. 187, line 31.Bracon politus Provancher, Addit. faun. Canad. Hymen., 18S8, p. 373.Microbracon (Bracon) nuperus Pierce, U. S. D. A., Bur. Ent. Bull. 63, 1909,p. 44.Type.?No. 1686, Philadelphia Academy of Sciences, Philadelphia,Pennsylvania. The types of minimus (Cat. No. 1613, allotype; holo-type lost) and politus (Cat. No. 19G9) are in the United StatesNational Museum. The allotype of vernoniae Ashmead, which alsobelongs here, is likewise in the National Museum.Resembles tenuiceps in the general conformation of the head, inthe polished frons, completely polished propodeum, in the duskywings and the long ovipositor, but can be readily separated. It isvery closely allied to curtus, and some males can probably be dis-tinguished only with great difficulty ; the female differs in the longerovipositor.Head thin, the face but slightly receding; eyes shorter than intenuiceps; transverse diameter of the opening between clypeus andmandibles not distinctly one and one-half times the length of themalar space in either sex; ocell-ocular line at least three times thediameter of an ocellus; antennae usually 21 to 30 segmented, thenumber varying with the size of the insect ; thorax, with propodeum,entirely highly polished; second abscissa of radius about twice thefirst; the third longer than the first and second combined; radiusattaining wing margin before the apex ; last abscissa of cubitus longerthan the preceding abscissa; plate of first abdominal tergite ratherbroad posteriorly, smooth and polished, sometimes more or lesspunctate along apical margin ; second tergite usually with a polishedelevation medially at base, and more or less rugulose on the basaltwo-thirds; suturiform articulation usually slightly arcuate medi-ally and finely foveolate; second tergite as long as the third; thirdand following completely polished ; ovipositor sheaths as long as thebody. Head black, rarely with poorly defined ferruginous innerorbital markings; thorax wholly black, although rarely with someferruginous or testaceous markings; wings strongly infuscated on
48 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67basal two-thirds, more hyaline at apex ; legs, at least the coxae, nearlyalways black; rarely the coxae mostly ferruginous or testaceous;femora sometimes testaceous or yellowish-brown, although frequentlymostly black; abdomen varying from entirely ferruginous or testa-ceous, except at extreme base, to entirely black except more or lessof second and third tergites.Distribution.?From Montana to Mexico, and from Illinois toCalifornia; apparently more common over the western half of theUnited States.Hosts.? ? Orthoris crotchii LeConte; larva feeding in seed cap-sules of Vemonia.In addition to the types, the following material, all of it in theNational Museum, has been examined; the allotype of vernoniaeAshmead, which is certainly nuperus; two specimens labeled " para-site on dipteron in seeds of Vemonia, Kirkwood, Missouri, M. E.Murtfeldt;" one female bearing Bureau of Entomology No. 3557%and dated May 18, 1885, which are the same data found on the labelsof the allotype of vernoniae; one specimen labeled " Pullman, Wash-ington, C. V. Piper, Wash. Exp. Sta. No. 010;" and collected speci-mens from Helena, Montana; Las Cruces, New Mexico (Cockerell) ;Texas (Belfrage) ; Alameda Co., California; Forest Grove, Oregon(L. P. Rockwood) ; "40 miles north of Lusk, Wyoming;" TorreonCoahuilo, Mexico; Algonquin, Illinois. There is one specimen atthe Gipsy Moth Laboratory of the Bureau of Entomology fromFresno, California (M. E. Phillips). Pierce records the species ashaving been reared in very large numbers from Orthoris crotchii,feeding in the seed pods of Mentzelia nuda at Clarendon, Texas.
32. MICROBRACON CURTUS (Provancher)Pliylax curtus Provancher, Addit. faun. Canad. Hyiueii., 1886, p. 130.Zele curtus Provancher, Addit. faun. Canad. Hymen., 1SSS, p. 380.Type.?Blue label 277, yellow label 127G, Museum of Public In-struction, Quebec, Canada.Head thin antero-posteriorly, the face scarcely receding; malarspace, in female, about as long as first flagellar segment; face andfrons smooth and polished ; antennae of type 25-segmented, none ofthe flagellar segments twice as long as thick; thorax stout, smoothand polished; propodeum completely polished, without even a stubof a median ridge at apex; radius arising before middle of stigma;second abscissa of radius scarcely twice the first; last abscissa ofcubitus not distinctly longer than the preceding abscissa; abdomenbroad-oval, entirely smooth and polished, with no suggestion of sculp-ture on the second tergite, in which respect this species appears todiffer from nwperus; ovipositor sheaths slightly longer than the ab-
art. 8 REVISION OF THE GENUS MICEOBRACON?MUESEBECK 49domen. Head and thorax mostly brownish-black to black; wingsstrongly infuscated on basal two-thirds; legs, including coxae tes-taceous to reddish-brown ; abdomen mostly testaceous to ferruginous.Distribution.?Ottawa, Canada.Host.?Unknown.The foregoing notes are based on the type, and a homotype (de-termined by Rohwer) ; the latter is in the United States National Mu-seum; it bears no locality data.
33. MICROBRACON HYSLOPI ViereckMicrobracon hyslopi Viereck, Proc. U. S. Nat. Mus., vol. 42, 1912, p. 143.Type.?Cat. No. 14316, U.S.N.M.Head not very prominent at insertion of antennae; face slightlyreceding; malar space in female about as long as first segment of an-tenna! flagellum; the transverse diameter of the opening betweenclypeus and mandibles but little greater than the distance from thisopening to the eye; face very faintly punctate; frons weakly punc-tate just above insertion of antennae; antennae usually 30 to 40segmented ; the two basal flagellar segments of equal length, all flagel-lar segments considerably longer than broad, but none of them dis-tinctly twice as long as broad; oeell-ocular line three times as long asthe diameter of an ocellus; thorax stout, smooth and polished; pro-podeum with a distinct stub of a median ridge at apex; radius notattaining apex of wing, second abscissa of radius about twice as longas the first, the third about as long as the first and second combined
;
the portion of cubitus between recurrent and first intercubitus morethan half as long as recurrent: abdomen robust, mostly smooth andpolished: first tergite rugulose along posterior margin; second ter-gite more or less rugulose or granular; third tergite rarely faintlypunctate; ovipositor sheaths fully as long as the abdomen. Headblack, sometimes with ferruginous or testaceous inner and superiororbital markings; cheeks and temples sometimes testaceous; thoraxwith mesoscutum and scutellum and more or less of the pleura usuallytestaceous ; propodeum and pectus black ; rarely thorax almost whollyblack ; wings rather strongly infuscated, the stigma, at least at baseand along costal margin bright yellow ; all coxae and trochanters, andusually most of the middle and hind femora, tibiae and tarsi, black;abdomen usually mostly testaceous, with black median areas on mostof the tergites.Distribution.?Washington, Oregon, Utah, Colorado.Host.?Etiella zinckenella schisiicolor Zeller.In addition to the type the United States National Museum hasthree specimens reared from a lepidopteron on Trifolium at Manzan-
50 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67ita, Oregon, by L. P. Rockwood, and one specimen from Colorado. Atthe Gipsy Moth Laboratory there are two specimens from Salt LakeCity. 34. MICROBRACON NITIDUS (Provancher)Bracon nitidus Provancher, Natural. Canad., vol. 14, 1SS3, p. 15.Type.?Yellow label 1026. Museum of Public Instruction, atQuebec, Canada.The following notes were made upon an examination of the tpye
:
Frons polished ; antennae 28-segmented, stout, the flagellar segmentsbeyond second only a little longer than broad: transverse diameterof opening between clypeus and mandibles but very little greaterthan the distance from the opening to the eyes; malar space as longas or longer than the first segment of antennal flagellum; thoraxnearly twice as long as its greatest height, smooth and polished ; pro-podeum mostly smooth and polished, with a median longitudinalcarina extending from the apex half way to the base, and finelysculptured along the median line between the end of this carina andthe base, usually also with a little faint sculpture either side of themedian line on the basal half; second abscissa of radius a little morethan twice as long as the first; the third abscissa slightly longerthan the first and second abscissae combined ; first abdominal tergitebroad posteriorly, finely rugulose laterally and a little punctatealong the apical margin; second tergite slightly rugulose over a smallbasal middle area, very faintly punctate over most of the remain-der of its surface, strongty shining, third and following tergitessmooth and polished; ovipositor sheaths about as long as the abdo-men. Head blackish; face brownish-black; thorax black; wings alittle dusky ; legs reddish-yellow, the coxae black or blackish ; abdo-men black, the second and third tergites mostly yellowish-ferrugi-nous; apical margin of third tergite black; base of fourth tergitereddish.Distribution.?Canada ; Maine.Host.?Unknown.In addition to the type, I have seen a female specimen taken byC. W. Johnson at Fort Kent, Maine, August 19, 1910, which, fol-lowing comparison with the type, I designated a homotype. Thisspecimen is in the collection of the Boston Society of NaturalHistory. It differs from the type only in having 25 instead of 28segments in the antennae, and in having the parts that are testaceousin the type, reddish or reddish-brown. Mr. Johnson has taken twoother female specimens of this species, at Southwest Harbor andMount Desert, Maine, respectively. He has very kindly presentedone of these to the National Museum.
art. S REVISION OF THE GENUS MICROBRACON MUESEBECK 51
35. MICROBRACON TYCHII, new speciesFig. 21Somewhat resembles hyslopi, but can be readily distinguished bythe characters given in the key.Length 3.8 mm. Head rather thick antero-posteriorly at insertionof antennae; face strongly receding below; temples broad; trans-verse diameter of opening between clypeus and mandibles but verylittle greater than the distance from the opening to the eyes ; malarspace as long as first segment of antennal flagellum, or very nearly
;
antennae shorter than the body, 28-segmented, tapering slightlytoward tip, the basal flagellar segment about twice as long as broad,all the following considerably longer than broad; postocellar lineabout twice, ocell-ocular line three times, as long as the diameter ofan ocellus; face very faintly punctate and clothed with long hairs;frons smooth and polished; thorax rather robust, although abouttwice as long as high, smooth and polished ; parapsidal furrows withscattered long hairs; propodeum smooth and polished without adistinct median longitudinal carina posteriorly, but sometimes witha faint stub of a median ridge at apex; metapleura, propodeumlaterally, and the posterior coxae clothed with long silken hairs;second abscissa of radius usually decidedly less than twice the first;the latter about as long as the side of stigma bordering the firstcubital cell; the third abscissa of radius longer than the first andsecond abscissae combined; abdomen fully as long as the thorax;plate of first tergite more or less sculptured laterally and pos-teriori; second tergite transverse, about as long as the third, witha low polished tubercle at base in the middle, and the integumentimmediately adjoining the tubercle more or less finely sculptured;the second tergite laterally and posteriorly, and the third and fol-lowing tergites entirely, smooth and polished; suturiform articula-tion fine, smooth, not at all foveolate; ovipositor sheaths about aslong as the abdomen or slightly shorter. Black ; head entirely black
;
thorax black, the scutellum usually yellowish or ferruginous at apexand along its sides, and sometimes poorly defined pale markingson the mesopleura and pectus; wings dusky toward base, morehyaline apically; all coxae and trochanters, and more or less of thefemora basally, black; the tibiae and tarsi more or less blackish orfuscous; abdomen black except along the lateral margins.Male.?Essentially as in the female. The antennae are 30-seg-mented; the malar space is a little shorter and the opening betweenclypeus and mandibles a little larger, than in the opposite sex.
52 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67Type.?Cat, No. 26069, U.S.N.M.Type-locality.?Los Angeles County, California.Host.?Tychius semisquamosus LeConte.Described from 24 specimens reared in May and June. 1892, byD. W. Coquillet. 36. MICROBRACON PINI, new speciesFig. 14Closely resembles tychii, but differs in the somewhat shorter malarspace, the larger opening between clypeus and mandibles, in thepresence of a distinct sharp stub of a median longitudinal ridgeat the apex of propodeum; in the first abscissa of radius beingshorter than the inner side of stigma, and in the legs being usuallyless black.Female.?Length, 3 mm. Head much thicker antero-posteriorlyat insertion of antennae than at the lower margin of clypeus ; trans-verse diameter of opening between clypeus and mandibles greater thanthe distance from the opening to the eyes, malar space much shorterthan the first segment of antennal flagellum ; temples not as broad asin the preceding species, postocellar line scarcely one and one-halftimes, ocell-ocular line less than three times, the diameter of an ocel-lus; antennae 31-segmented, the first flagellar segment about twiceas long as broad, all the following considerably longer than broad
;
face and frons polished ; thorax smooth and polished, parapsidal fur-rows sparsely hairy; propodeum polished, with a distinct stub of amedian longitudinal ridge at apex; second abscissa of radius de-cidedly less than twice the first; the third abscissa longer than thefirst and second abscissae combined; last abscissa of cubitus muchlonger than the preceding abscissa; the portion of cubitus betweenrecurrent and first intercubitus much more than half as long as therecurrent; abdomen long-oval; plate of first tergite more or lesssculptured laterally and apically; second tergite reguloso-striatemedially, smooth and shining laterally ; third and following tergitessmooth and polished; rarely the third faintly sculptured; ovipositorsheaths about as long as the abdomen beyond first tergite. Black;head and thorax wholly black; wings very slightly dusky; coxaeusually mostly black or blackish, remainder of legs brownish withmore or less infuscation ; abdomen black ; second tergite usually yel-lowish-brown except medially where it is black; third tergite usuallysomewhat yellowish along basal margin and laterally.Male,?Agrees with the female except for the usual sexual dif-ferences. Antennae 33-segmented, the flagellar segments a littlemore slender than in the female.Type.?Cat. No. 27143, U.S.N.M.Type-locality.?Gardner, Massachusetts.
art. 8 REVISION OF THE GENUS MICROBRACON? MUESEBECK 53A Uotype-locality.?Saugus, Massachusetts.Host.?Pissodes strobi Peck.Described from 8 female and 4 male specimens reared at theGipsy Moth Laboratory, Melrose Highlands, Massachusetts, fromthe above-named host, by J. V. Schaffner under Gipsy Moth Labo-ratory Nos. 12164 H 1-a, and 12164 H 1-b. There are several addi-tional specimens in the United States National Museum, reared fromPissodes strobi taken at Rainbow, Windsor, and Portland, Connecti-cut, by S. N. Spring, B. H. Walden and M. P. Zappe.
37. MICROBRACON SESIAE, new speciesFigs. 8, 9Very similar to nevadensis, but distinguished as noted in the tableto species.Female.?Length, 4 mm. Head thick at insertion of antennae;face short, receding below; transverse diameter of tfye opening be-tween clypeus and mandibles considerably greater than the shortestdistance from the opening to the eyes, and nearly as long as thedistance from lower margin of antennal foramina to the clypeus;malar space shorter than first segment of antennal flagellum; eyesbroad, very sparsely hairy; ocell-ocular line about three times aslong as the diameter of an ocellus; face finely punctate; fronsvery faintly punctate just above antennae; antennae 32-segmentedin type, stout, most of the flagellar segments only a little longerthan broad; thorax stout, smooth and polished; parapsidal groovesvery sparsely hairy; propodeum smooth and polished, with a shortstub of a median longitudinal ridge at apex and a few short lateralridges diverging from this; posterior tibiae and tarsi long, thethird segment of tarsi about as long as the fifth, the second muchlonger; radius attaining wing margin distinctly before the apex;second abscissa of radius twice as long as the first; the third fullyas long as the first and second combined and as long as the lastabscissa of cubitus ; the latter is distinctly longer than the precedingabscissa of cubitus, the third cubital cell being longer, measuredalong the cubitus, than the second; abdomen long-oval; the chitin-ized plate of the first tergite sculptured laterally and along theapical margin; second tergite usually mostly finely longitudinallystriate with a more or less triangular median embossed area, whichis broadest at the base of the tergite; third tergite nearly alwaysfinely striate toward base; remainder of dorsum of abdomen smoothand polished; ovipositor sheaths about as long as the abdomen.Head black, usually with poorly defined ferruginous orbital mark-ings; thorax black, usually somewhat marked with ferruginous,especially in the parapsidal furrows and on the propleura; wings
54 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.67dusky, weakly so toward apex; coxae and trochanters black orblackish; the femora varying from entirely ferrugino-testaceousto almost entirely black; even in specimens having the posteriorfemora wholly ferruginous the hind tibiae are entirely black exceptat extreme base and their tarsi are black ; abdomen mostly yellowishferruginous, with the first tergite and the embossed area on secondblack ; sometimes apex of abdomen is more or less blackish.Male.?Agrees with the female in all essential characters. Theantennae of allotype are 34-segmented.Type.?Cat. No. 26663, U.S.N.M.Type-locality.?Wallingford, Connecticut.Host.? (Sesia) Aegeria tipuliformis Linnaeus.Described from 7 female and 8 male specimens reared by B. A.Porter in the Bureau of Entomology. In this series the number ofsegments in the antennae varies from 32 to 37.
38. MICROBRACON NEVADENSIS (Ashmead)Bracon nevadensis Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1S89 (1S88),p. 623.Type.?Cat. No. 2916, U.S.N.M.Exceedingly similar to sesiae; but the antennal segments are evenstouter than in that species; the radial cell is shorter; the last ab-scissa of radius is distinctly shorter than the last abscissa of cubitus
;
and the duskiness of the posterior tibiae is confined to the apicalthird. The antennae are very stout, most of the flagellar segmentsbeing not longer than broad and some of them being broader tha-ilong; opening between clypeus and mandibles large; the thorax isnot quite so deep as in sesiae, being twice as long as its greatestheight; in the sculpture of the abdomen and the color of the bodythe two species agree almost exactly; the difference in the color ofthe tibiae noted above appears to be constant ; the ovipositor sheathsare about as long as the abdomen.Distribution.?California; Idaho.In addition to the type, the United States National Museum hasfour specimens recorded as a parasite of Ghrysobothris deletaLeConte on strawberry, at Coeur d'Alene, Idaho, under Bureau ofEntomology No. 476502 .
39. MICROBRACON THURBERIPHAGAE, new speciesMicrobracon, new species, Webb, Journ. Econ. Ent, vol. 16, 1923, p. 545.Female.?Length, 2.5 mm.; head rather thick at insertion of an-tennae ; face strongly receding below ; malar space much shorter thanfirst segment of antennal flagellum and only a little more than halfthe transverse diameter of the opening between clypeus and mandi-
art. S REVISION OF THE GENUS MICROBEACON MUESEBECK 55bles; postocellar line one and one-half times, ocellocular line lessthan three times, as long as the diameter of an ocellus ; antennae 23segmented in the type, shorter than the body, all the flagellar seg-ments considerably longer than broad, the first twice as long as broad
;
eyes very short-oval, only a little longer than broad; face faintlypunctate, shining; frons closely minutely punctate or reticulate;thorax compact, smooth and polished ; scutellum large, the furrow be-tween it and the mesoscutum very fine, minutely foveolate; propo-deum polished, with a short stub of a median longitudinal ridge atapex ; radius arising much before the middle of the long stigma andgoing to extreme apex of wing; second abscissa of radius twice, or.nearly, as long as the first, the third about as long as the first andsecond combined; abdomen short oval; the chitinized plate of thefirst tergite broad posteriorly, more or less rugulose laterally andfaintly sculptured along apical margin; second tergite emarginatemedially behind, mostly smooth, shining, with a small basal medianembossed area set off by short impressions, and usually with twolongitudinal furrows laterally, suturiform articulation arcuate andfinely foveolate; third, fourth, and fifth tergites evenly granular;ovipositor sheaths a little longer than the abdomen. Yellow; an-tennae and stemmaticum black ; occipufblackish ; wings very slightlydusky ; legs yellow, the posterior tibiae at apex and their tarsi dusky
;
abdomen entirely yellow.Male.?Agrees with the female except for the usual sexual differ-ences; antennae 23-segmented ; the mesonotal lobes, the propodeum,and the posterior coxae are somewhat infuscated.Type.?Cat, No. 26667, U.S.N.M.Type-locality.?Sabino Canyon, Arizona.Host.?Thurberiphaga diffusa Barnes.Described from two female and five male specimens reared by C. H.T. Townsend, October 2, 1918. The thorax and abdomen are some-times more or less marked with black, and the middle and posteriorcoxae, at least of the males, are sometimes black. The number ofsegments in the antennae varies, in this series, from 21 to 23.
40. MICROBRACON PITYOPHTHORI, new speciesFemale.?Length, 2.3 mm. Head much thicker at insertion ofantennae than at the clypeus, the face strongly receding; malarspace nearly as long as the transverse diameter of the opening be-tween clypeus and mandibles, but much shorter than the first seg-ment of antennal flagellum; eyes short oval, hardly one and one-half times as long as broad ; ocelli small ; postocellar line about oneand one-half times, ocell-ocular line three times, as long as thediameter of an ocellus; antennae very slender, slightly shorter than
56 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67the body. 23-segmented : the first flagellar segment three times aslong as thick, all the following at least twice as long as thick; facevery faintly punctate, shining; frons minutely reticulately punc-tate; thorax robust, smooth and polished; parapsidal grooves verysparsely hairy anteriorly, more closely so posteriorly; propodeumsmooth and polished with an exceedingly short stub of a medianridge at apex ; stigma very long ; veins slender ; radius arising muchbefore middle of stigma and going to extreme apex of wing ; first ab-scissa of radius long; second abscissa hardly twice the first; thethird as long as the first and second combined ; abdomen broad-oval
;
chitinized plate of first tergite finely rugulose apically; second ter-gite delicately ruguloso-striate, with a more or less distinct finemedian raised line down the middle ; suturiform articulation slightlyarcuate medially ,and curving forward strongly at the sides, weaklyfoveolate; third and fourth tergites finely granular, smooth later-ally, the fourth with a fine impressed transverse line at the base:fifth tergite very faintly punctate, strongly shining; ovipositorsheaths as long as the dorsum of abdomen beyond first tergite.Head piceous, the face yellowish ferruginous; thorax dark red-dish brown ; legs, including all coxae, yellow ; wings perfectly clearhyaline; abdomen yellowish ferruginous."Type.?Cat. No. 27144, U.S.N.M.Type-locality.?Las Vegas, New Mexico.Host.?Pityophthorus, species.Described from two female specimens reared by Barber andSchwarz from the above host, which was infesting twigs of Pinusedulis. 41. MICROBRACON LAEMOSACCI, new speciesClosely related to the preceding species, as indicated in the key.but differing especially in the characters there noted.Female.?Length, 3 mm.; head thick antero-posteriorly at insertionof antennae; face receding; transverse diameter of opening betweenclypeus and mandibles fully twice as long as the malar space, andmuch longer than the distance from the opening to the eyes; eyesbroad-oval; postocellar line slightly longer than the diameter ofan ocellus; ocell-ocular line twice the diameter of an ocellus; an-tennae slender, a little shorter than the body, 27-segmented ; the firstand second flagellar segments nearly three times as long as thick,all the following at least twice as long as thick; thorax compact,smooth, and polished; parapsidal grooves thickly hairy anteriorlyas well as posteriorly; propodeum polished, with a short stub of amedian longitudinal ridge at apex; stigma long; radius arisingmuch before middle of stigma and going practically to the apex of
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 57
wing; first abscissa of radius longer than the recurrent; the secondnot or hardly twice as long as the first; the third longer than thefirst and second combined; last abscissa of cubitus longer than thepreceding abscissa; radiella distinct only at base; abdomen broad-oval; first tergite finely rugulose except at extreme base; secondtergite broadly emarginate behind, strongly longitudinally rugulose,with a usually distinct fine raised line down the middle; suturiformarticulation very broad, coarsely foveolate; third, fourth, fifth, andsixth tergites granular, the third more or less longitudinally sculp-tured ; ovipositor sheaths very nearly as long as the abdomen. Headtestaceous, a large median spot on the front and vertex, and theocciput black; thorax black, the parapsidal grooves and a largespot behind middle lobe of mesoscutum ferrugino-testaceous ; legs,including all coxae, yellow ; the posterior tibiae at apex and theirtarsi dusky, wings clear hyaline; abdomen curiously marked: thefirst tergite black, the second mostly black, with two small basalspots and the middle of the apical margin reddish-yellow; third,fourth, fifth, and sixth tergites black, reddish-yellow medially andat the sides.Male.?Agrees with the female in all essential characters; the an-tennae are 28-segmented ; the sixth abdominal tergite is smooth andpolished.Type.?Cat. No. 26666, U.S.N.M.Type-locality.?Altitude, 4,700 feet, Superstition Mountains, Ari-zona.Host.?Lasmosaecus, species in Thvrberia.Described from seven females and sixteen males reared by H. S.Barber. The number of segments in the antennae varies in this seriesfrom 26 to 29. The series is remarkably constant in the strikingcolor pattern. 42. MICROBRACON METACOMET ViereckMicrohracon metacomet Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 206, 20S.Type.?In the State Agricultural Experiment Station, at NewHaven, Connecticut.Face and frons finely punctate; antennae broken at tip, 25 seg-ments remaining, very slender, the first flagellar segment nearlythree times as long as thick, the remainder twice as long as broad;thorax smooth and polished; legs slender; first abscissa of radiuslong; the second not distinctly twice the first; the third muchlonger than the first and second abscissae combined; last abscissaof cubitus decidedly longer than the preceding abscissa; abdomenlong, very coarsely granular or rugulose, and nearly as coarsely sonn the fifth tergite as on the third: suturiform articulation broad,
58 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67foveolate, and somewhat arcuate mediall}7 , the second tergitebeing a little emarginate behind; hypopygium large; ovipositorsheaths nearly as long as the abdomen. Face yellow ; antennae most-ly yellowish ; frons, vertex and occiput mostly piceous to blackish
;
thorax wholly black ; legs, including coxae, bright yellow ; wings clearhyaline; abdomen mostly blackish above, yellow laterally.Distribution.?New Canaan, Connecticut.Host.?Unknown.Known only from the unique type.
43. MICROBRACON ATRICOLLIS (Ashmead)Bracon atricollis Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1SS9 (1888), p. 622.Micro~bracon naioaasorum Vieeeck, Bull. 22, Conn. Geol. and Nat. Hist. Sur-vey, 1917 (1916), pp. 205, 207.Type.?Cat. No. 2917, U.S.N.M. The type of nawaasorum is inthe Connecticut Agricultural Experiment Station at New Haven.Very distinct from all other species of the genus. Head thick atinsertion of antennae ; face and frons minutely granular ; ocell-ocularline at least three times the diameter of an ocellus; antennae long,slender, usually about 40-segmented, most of the flagellar segmentstwice as long as broad; thorax long, mostly smooth and polished;parapsidal grooves sparsely hairy ; propodeum finely rugulose ; meta-pleura granular ; the metapleura and the propodeum laterally thicklyclothed with long hairs ; posterior tibiae and tarsi slender ; last seg-ment of all tarsi long, stout, the claws large; wings long, the entirewing membrane uniformly very densely covered with very shortpubescence ; stigma rather long and narrow ; radius arising at or be-fore its middle and going to extreme apex of wing ; first abscissa ofradius a little longer than the recurrent vein ; the second abscissa ofradius more than twice the first; the third as long as the first andsecond combined and almost on a straight line with the second ; theportion of cubitus between recurrent and intercubitus more than halfas long as the recurrent; lower side of cubital cell decidedly morethan twice the first intercubitus and longer than the lower side of thirdcubital cell ; last abscissa of radius longer than last abscissa of cubi-tus; cubitus and subdiscoideus nearly parallel, the second discoidalcell not or scarcely broadening toward apex; the chitinized plate offirst tergite strongly rugose; second tergite longer than the third,finely granularly rugulose, much less strongly sculptured than firsttergite; third, fourth, and fifth tergites very delicately sculptured,the fifth only faintly; ovipositor as long as the abdomen or a littlelonger. Head yellow; thorax mostly yellow; pronotum above, propo-deum, and metapleura partly, blackish; abdomen yellow, the firsttergite black, the following tergites more or less blackish medially.
art. 8 REVISION OP THE GENUS MICROBRACON MUESEBECK 59Distribution.? ? Missouri; Connecticut; Illinois.Host.?Unknown.Known only from the holotypes of atricollis and nawaasorum,and one additional female specimen, labeled "Algonquin, 111. 18-12-95-134, 4855." The only complete antennae are those on the type ofnawaasorum, which have 43 segments. A thorough studj' of thetypes shows nawaasorum to be, without doubt conspecific withatricollis. 44. M1CROBRACON ANALCIDIS (Ashmead)Bracon analcidis Ashmead, Proc. U. S. Nat. Mus., vol. 11, 18S9 (18S8), p. 619.Type.?Cat. No. 2908, U.S.N.M.Superficially quite similar to sphenophori, but differs especiallyin the thorax being smooth and polished, except on the propodeumwhich is mostly rugulose. Head thick antero-posteriorly at insertionof antennae ; face and frons finely punctate ; opening between clypeusand mandibles large, its transverse diameter twice as long as themalar space; antennae 35-segmented, the flagellar segments beyondsecond but little or no longer than broad; first flagellar segmentmuch longer than second; propodeum rugulose, smooth and shiningat base; second abscissa of radius more than twice as long as thefirst, the latter about half the first intercubitus ; abdomen long-first tergite sculptured apically and laterally ; second and third verydelicately granular, the following smooth and shining; ovipositorsheaths considerably longer than the abdomen. Entirely yellow;wings nearly hyaline; antennae, and the legs including all coxae,yellow.Distribution.?Missouri.Host.? (Analcis) Tyloderma fragariae Eiley.Known only from the unique type.
45. MICROBRACON PODUNKORUM ViereckMicrobracon podunkorum Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 205, 207.Type.?In the Connecticut Agricultural Experiment Station atNew Haven.Resembles the preceding species in the rugulose propodeum, andthe delicately sculptured abdomen, but differs as noted in the key.Antennae 31-segmented, stout, most of the flagellar segments but littleor no longer than broad ; face and frons finely punctate and opaque
;
thorax mostly polished; parapsidal furrows sparsely hairy; propo-deum completely finely rugulose; second abscissa of radius twiceas long as the first; abdomen a little longer than the thorax; plateof first tergite rugulose laterally and at apex; second tergite finelygranular with a strongly shining rugulose basal median area; third
60 PROCEEDINGS OF THE NATIONAL, MUSEL'M vol.67tergite very minutely granular; fourth and following tergites in-creasingly faintly sculptured, the fifth and sixth being almost com-pletely smooth; ovipositor sheaths as long as the abdomen beyondfirst tergite. Yellow; propodeum. first abdominal tergite, and abasal median spot covering the shining rugulose area on the secondtergite, black; wings very nearly hyaline; legs, including all coxae,yellow.Distribution.?Branford, Connecticut; Cadet. Missouri.Host.?Aristotelia absconditella Walker.Known only from the holotype, and a single female in the NationalCollection recorded under Bureau of Entomology number 4575?which was reared December 30, 1889, as a parasite of Aristoteliaabsconditella. 46. MICROBRACON MONTOWESI ViereckMierobracon montowesi Viereck, Bull. 22, Conn. Geol. anil Nat. Hist. Survey,1917 (1916), pp. 206, 208.Type.?In the State Agricultural Experiment Station at NewHaven, Connecticut.Head not thin, but the temples narrow, receding directly behindthe eyes; head broader than the thorax; eyes unusually large, theface hardly broader between eyes than long between the antennalforamina and the lower margin of clypeus; face minutely punctatelaterally, smooth and shining medially ; frons very weakly punctate,shining ; antennae as long as the body, 32-segmented, all the flagellarsegments considerably longer than broad; thorax stout, smooth andpolished; parapsidal grooves sparsely hairy; propodeum smoothand polished, with a very short stub of a median ridge at apex ; firstabscissa of radius about as long as recurrent vein; second abscissaof radius about twice as long as the first; abdomen broad-oval;chitinized plate of first tergite almost entirely smooth, slightlysculptured at the apex; second tergite very delicately granular; thirdand following tergites smooth and shining; ovipositor sheaths lessthan half as long as the abdomen. Face yellow; frons and vertexmostly piceous to blackish; occiput black; thorax black, with fineferruginous lines in the parapsidal furrows, and with the apex ofscutellum and the propleura, ferruginous ; wings very slightly dusky
;
legs, including all coxae, yellow; the posterior tibiae at apex andtheir tarsi dusky ; abdomen yellow except the first tergite and abasal median spot on the second, which are black.Distribution.?New Haven, Connecticut.Host?fPriophorus acericaulis McGillivrav.The above notes are based on the type. The United StatesNational Museum has two male paratypes, reared with the typefrom maple leaf-stems infested with larvae of the above-named saw-
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 61
fly. These paratjqoes agree with the type in the essential characters;the antennae are 28-segmented ; the third and fourth abdominaltergites are very faintly partly sculptured.
47. MICROBRACON CEPHI GahanFig. 20Microbracon cephi Gahan, Proc. Eut. Soc. Wash., vol. 20, 1918. p. 19.Microbracon cephi Griddle, Can. Ent., vol. 55, 1923, p. 3.Type.?Cat. No. 21772, U.S.N.M.Transverse diameter of the opening between clypeus and mandiblesmuch greater than the distance from this opening to the eyes, in themale at least twice as long as the malar space; frons minutelypunctate or reticulate; antennae rarely with less than 35 segments:all the flagellar segments considerably longer than broad; thoraxlong, rather slender, highly polished; parapsidal furrows sparselyhairy; metanotum a little longer than is usual in the genus:propodeum usually longer than first abdominal tergite ; last segmentof posterior tarsi large, usually fully as long as the second tarsalsegment; second abscissa of radius more than twice as long as thefirst, the third about as long as the first and second combined;last abscissa of cubitus usually a little shorter than the preceding-abscissa ; abdomen long oval ; first abdominal tergite rugulose later-ally and apicaily; second to fifth tergites in the male, second tosixth in the female, granular; ovipositor sheaths not distinctly halfthe length of the abdomen, usually appearing much less than half.Yellow; usually entirely yellow, or with the mesonotal lobes,propodeum and first abdominal tergite piceous to blackish; rarelywith the thorax almost wholly black and the abdomen mostlyblackish above; wings a little dusky; legs, including coxae, yellow.Distribution.?North Dakota; Minnesota; Manitoba, Canada.Probably occurs throughout the range of its chief host, the WesternWheat-stem Sawfly.Host.?Cephus cinctus Norton.In addition to the type series the United States National Museumhas considerable material, all reared in the Bureau of Entomology,by C. N. Ainsiie, from Cephvs cinctvs taken at various points inNorth Dakota and Minnesota.
48. MICROBRACON HEMIMENAE RohwerFig. 11Uierobracon hemimenae Rohwer, Proc. U. S. Nat. Mus., vol. 49, 1915, p. 232.Type.?Cat. No. 18434, U.S.N.M.A very distinct species, combining a black head and black coxaewith a sculptured frons and a nearly completely sculptured abdomen.
62 PKOCEEDINGS OF THE NATIONAL MUSEUM vol. 67Malar space in the female nearly as long as the transverse diameter
.of the opening between the clypeus and mandibles ; in the male con-siderably shorter; postocellar line slightly longer than the diameterof an ocellus ; ocell-ocular line less than three times as long as the di-ameter of an ocellus; antennae about as long as the body, usually 24to 28-segmented, all the flagellar segments much longer than tiroad
;
face and frons minutely punctate or reticulate, opaque ; thorax stout,smooth and polished ; radius arising before middle of stigma ; secondabscissa of radius about twice the first; abdomen short and broad,especially in the female; plate of first tergite broad, more or lesssculptured ; second tergite rugulose, shining ; suturiform articulationbroad, foveolate ; third, fourth and fifth tergites granular ; ovipositorsheaths about as long as the dorsum of abdomen beyond first tergite,or nearly. Head black, sometimes with ferruginous orbital lines;thorax black, the parapsidal furrows and a spot behind middle lobeof mesoscutum sometimes ferruginous; wings strongly infumated,more weakly so toward apex; coxae and trochanters black; femorasometimes more or less black ; posterior tibiae black except at extremebase ; tarsi blackish ; abdomen red, the first tergite black ; sometimes,especially in the males, more or less of the abdomen beyond firsttergite also blackish.Distribution.?Plummer Island, Maryland.Host.?Hemimene flummerana Busck.In addition to the types the National Museum has a large seriesbearing the same data as the type specimens.
49. MICROBRACON OENOTHERAE. new speciesVery similar to mellitor, from which it differs in having usually acomplete median longitudinal carina on the propodeum, in theshorter second abdominal tergite, and the relatively longer flagellarsegments of the antennae.Female.?Length, 4 mm. ; head rather thick at insertion of anten-nae ; transverse diameter of the opening between clypeus and mandi-bles but very slightly longer than the distance from the opening tothe eyes; antennae 35-segmented, the first flagellar segment twice aslong as broad, all the following much longer than broad; face andfrons very faintly punctate; thorax stout, smooth and polished;parapsidal grooves sparsely hairy ; propodeum polished with a com-plete median longitudinal carina; second abscissa of radius more thantwice as long as the first ; the third slightly longer than the first andsecond combined; abdomen long-oval; plate of first tergite more orless sculptured apically and laterally; second tergite very short,much shorter than the third, with a large median shining rugosearea; remainder of second tergite granular; third, fourth, fifth and
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 63
sixth tergites strongly granular; ovipositor sheaths about as long asthe abdomen. Head, thorax and abdomen yellow; antennae black-ish ; the median line of propodeum dusky ; legs, including all coxae,yellow ; the middle and hind tibiae and all tarsi more or less dusky orblackish ; wings strongly infuscated, especially toward the base.Male.?Agrees in most essential characters with the female. An-tennae broken, 28 segments remaining, the flagellar segments nearlytwice as long as broad ; eyes small ; ocell-ocular line about three timesthe diameter of an ocellus; malar space fully one-third the eye-height; propodeal carina not so distinct as in the type.Type.?Cat. No. 27145, U.S.N.M.Type-locality.?Knoxville, Tennessee.A llotype-locality.?Vienna, Virginia.Host.?Mompha eloisella Clemens.Described from 7 females and one male ; the type and two femaleparatypes were reared from the above host at Knoxville, Tennessee,by C. C. Hill in the Bureau of Entomology, under Knoxville No.16334; the allotype was reared by E. A. Cushman from Mompha,at Vienna, Virginia, under Quaintance No. 7805* two female para-types were secured by H. B. Weiss from seed capsules of eveningprimrose in Middlesex Co., New Jersey ; and two other paratypes arelabeled "On Oenothera, Glendale, Md., H. H. Bartlett, Oct. 23,1915." All the specimens agree very closely with the type in color andstructure; the number of segments in the antennae varies from 33to 36. 50. MICROBRACON PAPAIPEMAE GahanMicrobracon papaipemae Gahan, Proc. U. S. Nat. Mus., vol. 61, 1922, p. 4.Type.?Cat. No. 24983, U.S.N.M.Distinguished particularly by the color, the delicate sculpture ofthe abdomen, the very fine straight suturiform articulation and thelong ovipositor, the short and stout antennae, and the sculpturedfrons. Antennae shorter than the body, 26 to 28-segmented in thetype series; face granular; frons finely reticulately sculptured;thorax polished ; parapsidal grooves sparsely hairy ; propodeum pol-ished, with a short stub of a median carina at apex and a few shortridges diverging from it; second abscissa of radius more than twiceas long as the first; the third fully as long as the first and secondcombined and going to the apex of wing ; last abscissa of cubitus nolonger than the preceding abscissa ; abdomen long-oval ; first tergitesculptured laterally and at apex; second tergite granular with afinely rugulose area medially ; suturiform articulation very fine, per-fectly straight; third and following tergites gradually more deli-cately sculptured, the fourth and fifth faintly so ; ovipositor sheaths
64 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.67
nearly as long as the body. Head black, except the face which isyellow ; thorax black ; wings nearly hyaline ; legs yellowish, the hindtibiae and tarsi blackish; abdomen black, the membranous marginsof first tergite, the sides of the second tergite and the suturiformarticulation, yellow.Distribution.?Rye, New York.Host.?Papaipema frigida Smith.Known only from the four female specimens of the type series.
51. MICROBRACON APICATUS (Provancher)Bracon apicatus Provancher, Natural. Canad., vol. 12, 18S0, p. 143.Type.?In the Museum of Public Instruction at Quebec, Canada.The transverse diameter of the opening between clypeus and man-dibles slightly greater than the distance from the opening to theeyes ; antennae of type broken, 25 segments remaining ; the flagellarsegments stout, those beyond the second but very little longer thanbroad ; malar space about as long as the first flagellar segment
;
frons minutely closely punctate or reticulate and opaque; thoraxpolished; propodetim polished, with a prominent stub of a medianridge at apex and a little fine sculpture adjoining this; secondabscissa of radius more than twice as long as the first; abdomenof type missing; head yellow, with a median spot on front andvertex enclosing ocelli, and the occiput, blackish; thorax black, thepropleura, lateral anterior angles of mesoscutum, the parapsidal fur-rows and the space behind the middle lobe of mesoscutum, fer-ruginous; legs, including all coxae, testaceous; the posterior tibiaeat apex and their tarsi, fuscous.Distribution.?Canada; ?Maine; ?Long Island, New York.Host.?Unknown.The above notes are based on the type. The United States Nation-al Museum lias two specimens without locality data, one of themcalled apicatus by Ashmead, another from Ottawa, Canada, alsonamed apicatus by Ashmead, and two specimens from Long Island,New York, all of which appear to be this species although positiveidentification is difficult owing to the loss of the type abdomen. Thehead and thorax, with their appendages, agree perfectly with thetype in structure and color, and in placing the species in the key Ihave considered these specimens to be apicatus. The single completeantenna has 30 segments; the abdomen is very delicately sculpturedbeyond the second tergite; the second is granular; the suturiform ar-ticulation, straight, finely minutely foveolate ; the ovipositor sheathsas long as the abdomen. One specimen, with 30-segmented antennae,in the collection of the Boston Society of Natural History, was col-lected by C. W. Johnson at Bar Harbor, Maine. The abdomen of all
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 65
of these specimens is somewhat longer than suggested by Provan-cher's description, and the type may be a different species, but theagreement of the antennae, and of the structure, sculpture and colorof the thorax, is striking.
52. MICROBRACON NANUS (Provancher)Bracon nanus Peovancher, Natural, Canad., vol. 12, 1880, p. 143.Type.?In the Museum of Public Instruction at Quebec, Canada;bears yellow label 725.Frons finely reticulately sculptured and opaque; antennae 24-segmented, the segments of apical half of flagellum scarcely longerthan broad; thorax smooth and polished; propodeum polished, witha stub of a median longitudinal ridge at apex and a slight longitudi-nal impression in front of this stub ; radius going nearly to the apexof wing; second abscissa of radius more than twice as long as thefirst; second abdominal tergite finely granular; third tergite withonly a faint suggestion of sculpture; remainder of dorsum of abdo-men smooth and polished ; ovipositor sheaths as long as the abdomen.Head mostly blackish, face brownish-black; thorax black; wingsnearly hyaline ; legs, including all coxae, bright testaceous ; abdomenblack above, the second tergite mostly, the third laterally, and mostof the venter, yellow.Distribution.?Canada.Host.?Unknown.The above notes are based on the type. The only other specimenknown to me is a female, without locality data, which is in the UnitedStates National Museum.
53. MICROBRACON MELLITOR (Say)Figs. 4, 18Bracon mellitor Say, Bost. Journ. Nat. Hist., vol. 1, 1S36, p. 256.Bracon xanthostigma Cresson, Proc. Ent. Soc. Phila., vol. 4, 1865, p. 303.Bracon vernoniae Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1SS9, (1SS8), p. 619.Bracon anthonomi Ashmead, Insect Life, vol. 5, 1893, p. 185.Bracon mellitor Hunter and Hinds, U. S. D. A., Bur. Ent. Bull. 45, 1904, p.106, fig. 4.?Pierce, U. S. D. A., Bur. *Ent. Bull. 73, 190S, p. 39.Microoracon pemoertoni Bridwell, Proc. Haw. Ent. Soc, vol. 4, pt. 1, 1919(1918), p. 115.Type.?The type of mellitor is lost; that of xanthostigmus is in thePhiladelphia Academy of Sciences, and bears No. 1687.1 ; the types ofvernoniae (Cat. No. 2909), anthonomi (Cat. No. 1360), and paratypesof pembertoni (Cat. No. 23615) are in the United States NationalMuseum.Say's description of mellitor will fit any one of several other speciesof Microbracon as well as this species. But since the name mellitor12053?25 5
66 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.67has been widely used in literature on economic entomology for thespecies here treated under that name, and since it is impossible toshow conclusively that Say did not actually prepare his descriptionfrom a specimen of this species, it seems best to continue to use thename mellitor. There is tremendous variation in the size of indi-viduals of this species, and with this is combined rather marked vari-ability in structure and sculpture, particularly in the males, whichit is often very difficult to identify. The malar space in the femaleis about as long as the first segment of the antennal flagellum ; it isconsiderably shorter in the male; the antennae are rather stout, andare from 26 to 40-segmented, the smallest number of segments beingfound in very small males ; most frequently the antennae are from 32to 36-segmented ; most of the flagellar segments are usually only alittle longer than broad; the thorax is polished; the propodeum witha stub of a median ridge at apex; second abscissa of radius usuallynot distinctly twice as long as the first ; the third not longer than thefirst and second combined; the radius attaining the wing marginbefore the apex; abdomen usually broadly oval; the second tergitevarying from strongly granular to mostly rugose, nearly always dis-tinctly a little emarginate medially behind; the third to sixth ter-gites in the female, the third to fifth in the male, granular; oviposi-tor sheaths at least as long as the abdomen, sometimes considerablylonger, a good deal of variation being evident in the same series ofspecimens. In color mellitor is nearly always entirely testaceous orferruginous, with the propodeum and the first tergite blackish;rarely the thorax has black markings on the mesonotum and pectus.Distribution.?Occurs at least from Texas to South Dakota andeastward to the Atlantic States, where it is found as far north assouthern Massachusetts. Also occurs in the Hawaiian Islands; andquite probably is much more widely distributed than here noted.Hosts.?Anthonomus grandis Boheman; A. signatus Say; Poly-chrosis viteana Clemens; Pectinophora gossypiella Saunders.Material from these hosts has been examined. Other hosts, re-corded by Pierce, which records are probably correct, includeAnthonomus albopilosus Dietz, A. eugenii Cano, A. fulvus LeConte,A. squamosus LeConte, Desmoris scapalis LeConte.The National Museum has a large quantity of material of thisspecies reared from the cotton boll weevil, at various points in thecotton-growing area of the United States; also an extensive seriesreared by R. A. Cushman from the grapeberry moth at North-east, Pennsylvania, in the Bureau of Entomology under Quaintancenumbers, 11100, 11082, 14410, 14472 ; many specimens from the samehost reared by H. G. Ingerson at Sandusky, Ohio ; and collected speci-mens from points in Kansas, South Dakota, Florida, Texas, New
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 67Jersey, Virginia. In the collection of the Boston Society of NaturalHistory are two specimens from Woods Hole and Horseneck Beach,Massachusetts, collected by C. W. Johnson. A study of the typesleaves no doubt that xanthostigmus, vernoniae, anthonomi, andpevibertoni are the same species. The allotype of vernoniae isnuperus, as stated under that species.54. MICROBRACON NIGROPECTUS (Provancher)Bracon nigropectus Provancher, Natural. Canad., vol. 12, 1880, p. 143.Type.?In the Museum of Public Instruction, at Quebec, Canada.Malar space about as long as the first segment of antennal flagel-lum; face and frons minutely granular, opaque; antennae of typemissing beyond 10th segment; the flagellar segments beyond secondbut little longer than broad; thorax smooth and polished; parap-sidal grooves sparsely hairy; propodeum is mostly finely punctate,and is provided with a stub of a median longitudinal ridge pos-teriorly, with some short ridges diverging from this stub; secondabscissa of radius not quite twice as long as the first ; first abdominaltergite sculptured apically and laterally; second tergite granular,with an irregularly rugose basal median area; third, fourth, fifth,and sixth tergites finely granular; ovipositor sheaths about as longas the abdomen. Head yellow, antennae blackish; thorax yellowexcept propodeum and mesopectus, which are blackish ; abdomen yel-low, the first tergite with a blackish spot and third and fourthtergites weakly infuscated medially; wings nearly hyaline; legs,including coxae, yellow.Distribution.?Canada ; Vermont.Host.?Unknown.The above description is based on the type. The only other speci-men which I have seen is a female taken at Bennington, Vermont, byC. "W. Johnson. This specimen, which is in the collection of theBoston Society of Natural History, was compared with the type,and designated a homotype. The male is unknown.
55. MICROBRACON FURTIVUS (Fyles)Fig. 25Bracon furtivus Fyles, Can. Ent., vol. 24, 1892, p. 34.Bracon fungicola Ashmead, Journ. Cincinnati Soc. Nat. Hist., vol. 27, 1895,p. 46.Type.?The types of both species are in the United States Na-tional Museum, furtivus Cat. No. 14762 and fungicola Cat. No. 6864.This species is extremely variable, especially in color; the speci-mens of some series are entirely or almost entirely yellow; thoseof other series are mostly black ; all intergradations occur. The an-
68 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.67tennae are rather slender, all the flagellar segments being consider-ably longer than broad, and the two basal flagellar segments usuallybeing about equal; face and frons finely sculptured; transversediameter of the opening between clypeus and mandibles scarcelygreater than the distance from the opening to the eyes, in the fe-male; malar space long; propodeum smooth and polished, with astub of a median ridge at apex; second abscissa of radius usuallymore than twice as long as the first; last abscissa of radius notlonger than the first and second abscissae combined ; first abdominaltergite rugulose apically and laterally; second and following ter-gites granular, opaque; ovipositor sheaths as long as, or a littlelonger than, the abdomen, and slender, but broadening conspicu-ously on the apical fifth. Color varying from wholly yellow tomostly black ; but face and legs, including coxae, always yellow.Distribution.?From Canada to North Carolina, as judged by thematerial examined; probably occurs wherever its primary hosts arefound.Hosts.?Gnonmoschema gallaesolidaginis Riley; G. gallaeasteri-ella Kellicott.The above notes are based on the types and extensive series inthe National Museum reared from Gnorimoschema gallaesolidaginisby R. A. Cushman, at Vienna and East Falls Church, Virginia, andnorthern Pennsylvania, and by R. W. Leiby in North Carolina. Atthe Gipsy Moth Laboratory there is a series reared from the samehost taken at Melrose Highlands, Massachusetts. I have been un-able to separate fungicola from furtivus.
56. MICROBRACON TACHYPTERI, new speciesDistinguished especially by combining a sculptured frons anda short, broad, sculptured abdomen, with a blackish face and verylong ovipositor.Female.?Length, 3.3 mm. Head not thick; temples not broad,receding directly behind the eyes; face receding somewhat below;transverse diameter of opening between clypeus and mandiblesnearly twice as long as the malar space and about equal to halfthe width of the face; malar space much shorter than the firstsegment of antennal flagellum; ocell-ocular line a little more thantwice as long as the diameter of an ocellus; antennae 32-segmented,all the flagellar segments much longer than broad, the first two ofequal length and about twice as long as broad; face and fronsminutely granular ; thorax short, stout, smooth and polished ; parap-sidal grooves sparsely hairy; propodeum polished, with a shortstub of a median longitudinal ridge at apex; stigma large; secondabscissa of radius about twice the first; the third a little longerthan the first and second combined, and slightly longer than the
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 69last abscissa of cubitus; radius going practically to extreme apexof wing ; abdomen short and broad ; first tergite with the chitinizedplate large, strongly elevated posteriorly and rugulose laterally andalong apical margin; second tergite short and broad, slightlyemarginate medially behind, and finely rugulose or granular ; suturi-form articulation arcuate, foveolate ; third tergite much more finelysculptured than the second; fourth, fifth, and sixth tergites verydelicately sculptured, the sculpture becoming faint on the fifth andsixth; ovipositor sheaths about as long as the entire body. Black;head including the face, except narrowly along the eyes, black orblackish; malar space ferruginous; thorax black, the propleura,parapsidal grooves, and space behind the middle lobe of mesoscutum,more or less ferruginous; legs, including coxae, testaceous, exceptthe apical half of posterior tibiae and the posterior tarsi, which partsare blackish; wings slightly dusky; dorsum of abdomen black, yel-lowish laterally, the second and third tergites more broadly yel-lowish laterally.Type.?Cat. No. 26665, U.S.N.M.Type-locality.?French Creek, West Virginia.Host.?Tachypterus quadrigibbus Say.Described from a single specimen reared by F. E. Brooks underQuaintance No. 9521. The United States National Museum hasanother female specimen of this species labeled " Stony Island, N. Y.,July 8, 1896." 57. MICROBRACON VARIABILIS (Provancher)Opius variabilis Provancher, Addit. faun. Canad. Hymen., 1888, p. 382.Bracon tortricicola Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1889 (188S), p. 621.(Opius variabilis Provancher )=Microbracon dorsator Gahan, Proc. U. S. Nat.Mus., vol. 49, 1915, p. 93.Microbracon dorsator, var. variabilis Viereck, Bull. 22, Conn. Geol. and Nat.Hist. Survey, 1917 (1916), p. 207.Type.?In the Museum of Public Instruction, Parliament Build-ing, Quebec, Canada. The type of tortricicola (Cat. No. 2915) is inthe United States National Museum.Head not thick, the temples receding directly behind the eyes ; trans-verse diameter of the opening between clypeus and mandibles muchgreater than the distance from the opening to the eyes, in the malefully twice as long as the malar space, in the female one and one-halftimes as long; face and frons minutely punctate or reticulate; an-tennae usually 25 to 32-segmented, all the flagellar segments muchlonger than broad, the first two usually of about equal length andtwice as long as broad, the apical segments slender ; thorax compact,smooth, and polished ; parapsidal grooves sparsely hairy ; propodeumpolished, with a stub of a median longitudinal ridge at apex ; secondabscissa of radius more than twice as long as the first ; the third not
70 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67distinctly longer than the first and second combined ; abdomen broad-oval ; chitinized plate of first tergite rugulose laterally and at apex
;
second tergite broad, usually very faintly medially emarginate be-hind, granular, and usually with a basal median, shining, irregularlyrugose area; suturiform articulation rather broad, foveolate; thirdto fifth tergites, and sometimes the sixth in the female, granular ; ovi-positor sheaths usually about equal to the dorsum of the abdomenbeyond first tergite but sometimes apparently as long as the abdomen.Yellow, more or less marked with black ; sometimes entirely yellowbut more frequently with a spot enclosing ocelli, occiput, mesonotallobes, propodeum, pectus, first abdominal tergite and a basal medianspot on second, black or blackish ; face always yellow ; rarely thoraxalmost entirely black, and the abdomen largely blackish or duskyabove; wings very slightly dusky; legs, including all coxae, yellow,the posterior tibiae at apex and all the tarsi more or less dusky. Astudy of the types of variabilis and tortricicola has convinced me thatthey belong to the same species.Distribution.?Canada, Missouri, Connecticut, Pennsylvania, Vir-ginia, West Virginia.Hosts.?Polychrosis viteana Clemens; Conotrachelus nenupharHerbst; Tortricid in seeds of Ambrosia (Ashmead) ; larva in seed-pod of Oenothera biennis; Tachypterus quadrigibbus Say.The above characterization is based on the types, and on a largequantity of material in the National Museum. This material includesextensive series reared by R. A. Cushman from Polychrosis viteanaat Northeast, Pennsylvania, under Quaintance Nos. 11058, 11070,11432, and 14462; several series reared from Conotrachelus nenupharby the same investigator, at Vienna, Virginia, under Quaintance Nos.7025, 7050, and 7837; also several specimens obtained by Cushmanfrom the seed pods of the evening primrose, at Vienna, Virginia,under Quaintance No. 7195 ; and a single female reared from Tachyp-terus quadrigibbus Say, at French Creek, Virginia, by F. E. Brooks,under Quaintance No. 9505.
58. MICROBRACON SANNINOIDEAE GahanFig. 12Micro'bracon sanninoideae Gahan, Proc. U. S. Nat. Mus., vol. 53, 1917, p. 196.Type.?Cat. No. 20374, U.S.N.M.Differs from mellitor, to which it is quite similar in general ap-pearance, in having a much larger opening between clypeus andmandibles; in the shorter malar space; in the second abscissa ofradius being more than twice the first, and the third longer than thefirst and second combined; in the posterior margin of the secondtergite being straight, and in the tergites beyond the second being
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 71more weakly sculptured. The transverse diameter of the openingbetween clypeus and mandibles is usually twice as long as the malarspace; face and frons minutely punctate or reticulate; antennaeusually with 30 to 34 segments, the first flagellar segment longerthan the second, none beyond the first twice as long as broad; pro-podeum polished, with a stub of a median ridge at apex; radiusgoing more nearly to extreme apex of wing than is the case inmellitor; abdomen long-oval, beyond the second tergite usually verydelicately sculptured, the sculpture becoming faint beyond thefourth tergite; suturiform articulation straight, finely foveolate;ovipositor sheaths about as long as the abdomen. Usually entirelyyellow, except the antennae and posterior tarsi, but sometimes thethorax, especially on the mesonotal lobes, propodeum and pectus, andthe abdomen at base, more or less black.Distribution.?Occurs at least from Connecticut to Georgia, andwestward to Kansas and Arkansas.Host.?(Sanninoidea) Aegeria exitiosa Say.In addition to the types the National Museum has the followingmaterial: 2 specimens reared from A. exitiosa at Indianapolis, Indi-ana, by F. N. Wallace; 1 obtained from the same host hy E. M.Craighead, at Chambersburg, Pennsylvania; 1 taken on peach atHamden, Connecticut, by M. P. Zappe; 1 from Riley Co., Kansas(Marlatt) ; 6 reared from the peach borer at Fort Valley, Georgia,by C. H. Alden ; 15 from the same host at Rogers, Arkansas ; manyspecimens reared by E. B. Blakeslee from A. exitiosa, at Winchester,Virginia, and collected specimens from Harrisburg and Enterline,Pennsylvania. 59. MICROBRACON HOBOMOK ViereckMicrobracon hobomok Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 206, 20S.Type.?In the State Agricultural Experiment Station, at NewHaven, Connecticut.The following notes are based on the tj^pe : Malar space nearly aslong as the first segment of antennal flagellum ; antennae broken, 20segments remaining, the flagellar segments beyond the first scarcelyas long as broad; frons finely sculptured; thorax polished; parap-sidal grooves sparsely hairy; propodeum mostly polished, with astub of a median ridge at apex, a few short ridges diverging fromthis stub, and the median part of the posterior face somewhat punc-tate ; last abscissa of radius a little longer than the first and secondabscissae combined; abdomen long-oval; the first tergite rugulosealong the apex; second tergite finely granular; suturiform articula-tion fine, straight; third to fifth tergites very delicately sculptured,the sculpture becoming faint on the fourth and fifth; ovipositor
72 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67
sheaths as long as the abdomen beyond first tergite. Face yellow;vertex and occiput somewhat piceous; thorax mostly black, thepleura ferruginous; legs, including all coxae bright testaceous;wings very slightly dusky; abdomen yellowish, the first tergite, anda basal median spot on the second, blackish ; apical tergites more orless brownish. This species is very similar to apicatus, but differsespecially in the shorter ovipositor. I have seen no males of eitherspecies; doubtless it will be found almost impossible to separate thetwo species on the basis of this sex.Distribution.?Branford, Connecticut.Host.?Unknown.Known only from the holotype.
60. MICROBRACON CAULICOLA GahanFig. 13Microbracon caulicola Gahan, U. S. Nat. Mus., vol. 61, 1922, p. 2.Type.?Cat. No. 24982, U.S.N.M.Closely resembles mellitor, but differs in the shorter ovipositor, inthe longer flagellar segments of antennae, the usually straight pos-terior margin of second abdominal tergite; in the second abscissa ofradius being much more than twice as long as the first, in the radiusgoing more nearly to the extreme apex of wing, and in the propodeumbeing usually minutely reticulated over most of its surface. The an-tennae are usually 29 to 35-segmented, the two basal flagellar seg-ments usually twice as long as thick; propodeum usually delicatelyreticulated, sometimes granular and more strongly sculptured on themedian line; abdomen broadly oval; the first tergite rugulose later-ally and at apex, the second coarsely granular or rugulose; the thirdto sixth tergites in the female, the third to fifth in the male, granular,much less strongly sculptured than the second; ovipositor sheathsnearly as long as the dorsum of the abdomen beyond first tergite.Usually entirely yellow; rarely the propodeum and first abdominaltergite more or less fuscous; wings dusky, the stigma nearly alwaysyellow except at apex; in some small male specimens the stigma isbrownish; legs, including all coxae, yellow.Distribution.?Evidently occurs throughout the eastern half of theUnited States wherever its principal hosts are found.Hosts.?Pyrausta ainsliei Heinrich; P. penitalis Grote; P. nubilalisHuebner.In addition to the types and the other material mentioned byGahan as being contained in the collection of the National Museum,there are two specimens received from R. W. Harned, of Mississippi,bearing his No. S4750. At the Corn Borer Laboratory of the Bureauof Entomology, at Arlington, Massachusetts, there is a large quantityof material of this species, most of it reared from Pyrausta ainsliei,
art. 8 REVISION OF THE GENUS MICROBRACON MTJESEBECK 73from Champaign and Urbana, Illinois. There is also a series in thiscollection, recorded as probably from Pyrausta nubilalis. the intro-duced European Corn Borer, taken at Woburn, Massachusetts; anda single specimen reared from Pyrausta ainsliei by H. W. Allen, atAgricultural College, Mississippi.
61. MICROBRACON NIGER (Provancher)Ophts niger Pkovancher, Addit. faun. Canad. Hymen., 1888, p. 381.Microbracon niger Gahan, Proc. U. S. Nat. Mus., vol. 49, 1915, p. 93.Type.?In the Museum of Public Instruction at Quebec, Canada.The following notes are based on the type : Head not thin ; fronsdistinctly finely punctate; opening between clypeus and mandiblessmall, circular, its transverse diameter scarcely greater than the dis-tance from the opening to the eyes; antennae broken, only 13 seg-ments of one remaining, the other entirely missing; flagellar seg-ments slender, very nearly twice as long as thick; thorax stout,smooth and polished ; parapsidal furrows sparsely hairy ; propodeumpolished, with a short stub of a median ridge at apex and a fewshort ridges diverging from this stub; radius arising much beforemiddle of stigma ; second abscissa of radius fully twice as long as thefirst ; second cubital cell long ; third abscissa of radius hardly as longas the first and second abscissae combined; last abscissa of cubitusscarcely as long as the preceding abscissa ; second abdominal tergiteminutely granular, finely striate medially; third tergite finely punc-tate; remainder of dorsum of abdomen smooth; ovipositor sheathsabout as long as the abdomen behind first tergite. Head black, theface brown; thorax black; wings strongly infumated on basal half;legs yellowish, the coxae more or less dusky above, the posterior tibiaeand tarsi dusky ; abdomen piceous. A very small specimen.Distribution.?Cap Rouge, near Quebec, Canada.Host.?Unknown.Known only from the unique type.
62. MICROBRACON AEQUALIS (Provancher)Bracon aequalis Provancher, Natural. Canad., vol. 12, 1880, p. 141.Type.?In the Museum of Public Instruction, at Quebec, Canada.The following notes are based on the type: Face and frons finelysculptured; flagellar segments of antennae considerably longer thanbroad, the first nearly twice as long as broad; thorax smooth andpolished ; propodeum with a median carina extending from the apexnearly half way to the base; second abscissa of radius fully twice aslong as the first; first tergite sculptured apically and laterally; sec-ond tergite finely striate either side of the middle, punctate lat-erally; third and following tergites faintly punctate; ovipositor
74 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 67
sheaths as long as the abdomen beyond second tergite. Face yellow
;
frons, vertex, and occiput more or less piceous or blackish; thoraxblack; legs, including all coxae, yellow; wings nearly hyaline; ab-domen yellow, first tergite black, the apical tergites brownish.Distribution.?Canada.Host.?Unknown.The unique type is the only specimen of this species that I haveseen. 63. MICROBRACON ARGUTATOR (Say)Fig. 10Bracon argutator Say, Journ. Bost. Soe. Nat. Hist, vol. 1, 1836, p. 233.Type.?Lost.The species here regarded as argutator agrees very well with Say'sdescription, and it seems more desirable to identify it as that speciesthan to describe it as new. Head rather thick at insertion of an-tennae ; temples broad ; malar space in the female nearly as long asthe first segment of antenna! flagellum ; antennae normally 25 to 30-segmented, shorter than the body in the female ; eyes short-oval ; faceand frons finely punctate; thorax smooth and polished; parapsidalgrooves weakly hairy ; propodeum usually mostly weakly reticulatelysculptured, and more or less rugulose along the median line; secondabscissa of radius about twice as long as the first, the third slightlylonger than the first and second combined; abdomen long-oval, thefirst tergite sculptured apically and laterally; the second granular,usually as long as the first and longer than the third, more than halfas long as broad at base ; third, fourth and fifth tergites much moredelicately sculptured, shining; ovipositor sheaths projecting thelength of the abdomen beyond second tergite or a little more. Yel-low ; sometimes entirely yellow, with only a spot enclosing the ocelliblack; the abdomen often of a paler yellow than the thorax; some-times the occiput, mesonotal lobes, propodeum, pectus and first ab-dominal tergite more or less blackish; wings slightly dusky, thestigma more or less yellowish ; legs, including all coxae, yellow.Distribution.?Indiana ; Missouri.Host.?" Lepidopterous larva boring in Elymusf Saluria, species.The United States National Museum has considerable materialreared from the above hosts at Lafayette, Indiana and Charleston,Missouri, by C. N. Ainslie, in the Bureau of Entomology, underWebster Nos. 14705 and 14781.64. MICROBRACON GERAEI, new speciesVery similar to argutator, but distinguished as noted in the tableto species.Female.?Length, 3 mm. Head rather thick at insertion of an-tennae ; malar space much shorter than first flagellar segment of an-
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 75tennae ; transverse diameter of the opening between clypeus and man-dibles very much greater than the distance from the opening to theeyes, and at least one and one-half times as long as the malarspace; face and frons very delicately punctate; antennae usually 27to 33-segmented, slender, usually as long as the body, the first flagellarsegment about twice as long as broad; thorax smooth and polished;propodeum finely reticulate or minutely granular and opaque or sub-opaque; second abscissa of radius hardly twice as long as the first,the third a little longer than the first and second combined; lastabscissa of cubitus longer than the preceding abscissa; abdomenlong-oval ; first tergite rugulose laterally and at apex ; second tergitelarge, about as long as third, and about twice as broad at base aslong, granular, often a little rugulose medially; third, fourth, andfifth tergites, and sometimes the sixth, exceedingly delicately sculp-tured; ovipositor sheaths nearly as long as the dorsum of the abdo-men beyond first tergite. Yellow ; usually the frons, vertex, occiputand mesonotal lobes more or less black; even in the specimens whichhave these parts deep black, the propodeum and the abdomen in-cluding first tergite are almost invariably yellow ; wings very slightlydusky ; legs including coxae, yellow, the apical tarsal segment black.Male.?Antennae of allotype 31-segmented; other males vary inthis respect, the number of segments being usually 27 to 32. Some-times the thorax is almost entirely black, although usually at leastthe pectus and the propodeum are pale ; face occasionally with a quad-rate blackish spot. In some specimens the fourth and followingabdominal tergites are entirely polished.Type.?Cat. No. 26668, U.S.N.M.Type-locality.?Sioux City, Iowa.Host.?" Geraeus larva in Panicum."Described from eight female and three male specimens reared byC. N. Ainslie in the Bureau of Entomology, under Webster No.8885. In addition to the type series there is considerable materialin the National Museum, all of it reared from Panicum by C. N.Ainslie, at Sioux City, Iowa and Elk Point, South Dakota.
65. MICROBRACON LUTUS (Provancher)Bracon lutus Provancher, Natural. Canad., vol. 12, 18S0, p. 142.Dracon lixi Ashmead, Canad. Ent, vol. 25, 1893, p. 67.Type.?In the Museum of Public Instruction at Quebec, Canada.The type of lixi is in the United States National Museum (Cat. No.2145).Very closely related to variabilis and often very difficult to distin-guish from that species; it is generally more robust, has longer an-tennae, a slightly longer malar space, and usually slightly shorterovipositor sheaths. A study of the types of lutus and lixi has con-
76 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67
vinced me that they are the same species. Eyes very broad, not dis-tinctly one and one-half times as long as broad, in the female;malar space, in the female, very nearly half as long as the distancefrom the lower margin of antennal foramina to lower margin ofclypeus; antennae usually 36 to 40-segmented ; all the segmentsat least one and one-half times as long as broad; face and fronsfinely punctate, opaque; thorax stout, smooth and polished; pro-podeum mostly polished ; second abscissa of radius a little more thantwice as long as the first; the third slightly longer than the firstand second abscissae combined; second abdominal tergite granular,with a shining irregularly rugose area on basal middle; third,fourth, fifth, and in the female, the sixth, tergites finely sculptured
;
suturiform articulation rather broad, foveolate, usually a little arcu-ate medially; ovipositor sheaths as long as the abdomen beyond sec-ond tergite or a little longer. Yellow; spot enclosing ocelli, andocciput usually blackish; thorax varying from mostly black toblackish only on the mesonotal lobes and propodeum; wings usuallyslightly dusky; legs, including all coxae, yellow; abdomen yellow,with first tergite and a median spot on second, black; apical ter-gites usually brownish.Distribution.?Canada; Virginia; New York; Massachusetts;Pennsylvania.Hosts.?Lixus scrobicollis Boheman, in Ambrosia triftda; Papai-pema nebris Guenee.But little material of this species, in addition to the types, hasbeen seen. The United States National Museum has two specimensreared by H. Bird at Rye, New York, from Papaipema nebris; anda collected specimen from Natrona, Pennsylvania. The Corn-BorerLaboratory of the Bureau of Entomology has two specimens rearedfrom Ambrosia at Manchester, Massachusetts. All these specimensare females. 66. MICROBRACON CERAMBYCIDIPHAGUS, new speciesFig. 16Very similar to the preceding in habitus, structure and sculpture
;
it will frequently be found difficult to distinguish them. The char-acters given in the key together with the description should, how-ever, suffice to separate these two species, at least in the female sex.Female.?Length 3.5 mm. Head about as in lutus; temples reced-ing directly behind eyes; malar space as in lutus; postocellar linehardly exceeding the diameter of an ocellus; antennae of type 37-segmented, the two basal flagellar segments and also the apical seg-ments twice as long as thick ; thorax stout, smooth and polishedpropodeum a little roughened medially toward apex ; second abscissaof radius more than twice as long as the first; the third a little
art. 8 REVISION OF THE GENUS MICROBRACON?MUESEBECK 77longer than the first and second abscissae combined; abdomenbroadly oval; first tergite with the chitinized plate broad andsculptured apically; second tergite broad, nearly three times asbroad at base as long, not at all emarginate posteriorly, granular,with an irregularly rugose area on its basal middle; suturiformarticulation straight medially, curving forward a little laterally;third to sixth tergites finely granular; ovipositor sheaths about aslong as the abdomen beyond second tergite. Head, thorax andabdomen completely yellow; wings very nearly hyaline; legs, in-cluding all coxae, wholly yellow.Male.?Essentially as in the female; the antennae of the allotypeare 36-segmented ; the malar space is much shorter than in the fe-male; stemmaticum, occiput, mesonotal lobes, pectus, propodeumand spot on first tergite, black.Type.?Cat. No. 2G670, U.S.N.M.Type-locality.?Harrisburg, Pennsylvania.Host.?Oberea, species in Crataegus and Prunus.Described from ten female and two male specimens reared byH. B. Kirk.The color is more or less variable, but even in the darkest speci-mens of the type series the abdomen beyond first tergite is entirelyyellow. 67. MICROBRACON CINCTUS (Provancher)Phylax cinctus Provancher, Natural. Canad., vol. 12, 1880, p. 175.Zele cinctus Provancher, Addit. faun. Canad. Hymen., 1888, p. 380.Type.?In the Museum of Public Instruction, at Quebec, Canada..The following notes are based on the type, which is a male : Headnot thin; frons polished; transverse diameter of opening betweenclypeus and mandibles a little longer than the distance from theopening to the eye; antennae broken, 16 segments remaining, non&of the flagellar segments twice as long as thick; thorax smooth andpolished; parapsidal grooves sparsely hairy; propodeum polished,with a short stub of a median ridge at apex and a slight impressionjust before the stub; first abscissa of radius fully as long as the innerside of stigma ; the second abscissa of radius less than twice the first
;
abdomen missing; head and thorax black; wings dusky; legs, in-cluding all coxae, yellow. Somewhat resembles meromyzae, butthe thorax is not so long and slender as in that species, the firstabscissa of radius is longer, and the propodeum is without the-median carina which is usually distinct in meromyzae.Distribution.?Canada.
- Host.?Unknown.Known only from the broken holotype.
78 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.67
68. MICROBRACON WAWEQUA ViereckMicrohracon wawequa Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 204, 206.Type.?In the State Agricultural Experiment Station at NewHaven, Connecticut.Following are notes made upon an examination of the type, amale specimen in good condition : Head rather thick at insertion ofantennae; face and frons smootii and polished; antennae 34-seg-mented, all the flagellar segments longer than broad, the first dis-tinctly longer than the second; thorax long, rather slender, appar-ently twice as long as high, smooth and polished; propodeum pol-ished, with a short stub of a median ridge at apex; first abscissa ofradius very long, about three-fourths as long as the first intercu-bitus and more than half the second abscissa of radius ; last abscissaof cubitus longer than the lower side of second cubital cell ; abdomenlong; plate of the first tergite with two elongate pits laterally atapex; medially at apex this tergite is polished; second and follow-ing tergites completely polished; suturiform articulation very fine,not punctate or foveolate. Head and thorax wholly black; abdomenpiceous black; wings very strongly infumated; all coxae, and foreand middle femora mostly, black; posterior femora black at base onthe outer side.Distribution.?New Haven, Connecticut.Host.?Unknown.Known only from the unique type.69. MICROBRACON SULCIFRONS AshmeadMicrobracon sulcifrons Ashmead, Bull. 1, Colo. Biol. Assoc, 1S90, p. 15.Type.?Cat. No. 13638, U.S.N.M.Head rather prominent at insertion of antennae, the face recedingbelow ; face medially, and the frons, smooth and polished ; antennaerather stout, none of the flagellar segments twice as long as thick;thorax stout, smooth and polished ; propodeum with a median carinaextending nearly half way from the apex toward base and with afew short ridges diverging from this stub; legs of type missing be-yond coxae; metacarpus nearly twice as long as the stigma; secondabscissa of radius at least twice the first, the third not distinctly aslong as the first and second combined; abdomen rather short; firsttergite sculptured laterally and apically ; second tergite and basal two-thirds of third finely striate; suturiform articulation broad, straight,and strongly foveolate; apical third of third tergite and the fourthand following tergites smooth and polished. Body wholly black;coxae black; wings dusky.Distribution.?Smith's Park Gulch, Colorado.Host.?Unknown.The male type is the only specimen of this species that I have seen.
art. 8 REVISION OF THE GENUS MICROBRACON MUESEBEGK 79
70. MICROBRACON CANADENSIS (Ashmead)Optus canadensis Ashmead, Canad. Eut., vol. 23, 1891, p. 4.Microlracon canadensis Gahan, Proc. U. S. Nat. Mus., vol. 49, 1915, p. 93.Type.?Cat No. 15061, U.S.N.M.Somewhat resembles furtivus, but the last abscissa of radius ismuch longer, and the sculpture of the abdomen does not agree withany specimens of furtivus examined. Malar space at least one-thirdthe length of the face from antennal foramina to lower margin ofclypeus; antennae broken, the segments beyond the nineteenth miss-ing; first flagellar segment about twice as long as broad, the follow-ing subequal, about one and one-half times as long as broad ; thoraxsmooth and polished; second abscissa of radius less than twice thefirst ; the third much longer than the first and second combined, andgoing to the apex of the wing; last segment of posterior tarsi slen-der; first abdominal tergite sculptured laterally and at apex; thesecond granular, more or less striate medially ; suturiform articula-tion straight, finely foveolate; the third tergite finely granular; thefourth faintly so, strongly shining; the following smooth and pol-ished. Head piceous black, the face yellow; antennae yellowishbeneath toward base; thorax wholly black; legs, including coxae,yellow ; wings very slightly dusky ; abdomen black, except the secondtergite laterally and the suturiform articulation.Distiibution.?Ottawa, Canada.Host.?Unknown.The above characterization is based on the male type, which is theonly specimen I have seen.71. MICROBRACON KONKAPOTI ViereckMicrobracon konkapoti Viereck, Bull. 22, Conn. Geol. and Nat. Hist. Survey,1917 (1916), pp. 205, 207.Type.?In the State Agricultural Experiment Station, at NewHaven, Connecticut.The following notes are based on the type, which is a male speci-men: Somewhat resembles rhyssemati in habitus and sculpture ofthe abdomen, but differs in the color of the head, especially the face,and in the sculpture of the propodeum. Face smooth and shiningmedially; frons very faintly punctate; antennae broken, 20 seg-ments remaining, the first and second flagellar segments of aboutequal length, twice as long as broad ; malar space less than half thetransverse diameter of the opening between clypeus and mandibles;thorax rather long and slender, smooth and polished; propodeumpolished, with a short stub of a median ridge at apex, and from thisstub toward the base medially impressed, almost grooved, the impres-sion traversed by transverse ridges; first abscissa of radius a littlelonger than the recurrent vein and more than half as long: as the
80 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67second abscissa of radius ; radius going to the wing apex, the radialcell broad ; first abdominal tergite sculptured at apex ; second, third,fourth and fifth tergites rather evenly closely granular, the fourthand fifth a little less strongly so than the second and third. Entirebody honey-yellow except the head which is piceous black; the facemostly blackish; legs, including all coxae, yellow; wings slightlydusky.Distribution.?West Thompson, Connecticut.Host.?Unknown.Known only from the holotype.
72. MICROBRACON RHYSSEMATI (Ashmead)Bracon rhyssemati Ashmead, Joum. Cincinnati Soc. Nat. Hist., 1894, p. 46.Type.?Cat. No. 1362, U.S.N.M.Face and frons very minutely punctate; antennae 28 to 30-seg-mented, all of the flagellar segments much longer than broad ; trans-verse diameter of the opening between clypeus and mandibles at leasttwice as long as the malar space ; thorax smooth and polished ; parap-sidal furrows very sparsely hairy ; propodeum polished, with a medi-an longitudinal carina at least on the apical third, this carina some-times nearly complete, radius going practically to the wing apex;second abscissa of radius twice as long as the first, the third scarcelyas long as the first and second combined; first abdominal tergitefinely sculptured at apex; second, third, fourth, and fifth tergitesstrongly granular, opaque; sixth tergite faintly punctate, shining.
"Yellow, the mesonotal lobes, disk of first abdominal tergite and theapical tergites very slightly dusky; wings faintly dusky; legs, in-cluding coxae, yellow. The female is unknown.Distribution.?Ohio.Host.?Rhyssematus lineaticollis Say.In addition to the three specimens of the type series the UnitedStates National Museum has one male specimen from Columbus,Ohio. 73. MICROBRACON COOKII (Ashmead)Bracon cookii Ashmead, Proc. U. S. Nat. Mus., vol. 11,. 1889 (1S8S), p. 624.Type.?Cat. No. 2921, U.S.N.M.Very similar to furtivus; it cannot be satisfactorily distinguishedfrom that species on the basis of the male holotype, the only speci-men of cookii that I have seen. This specimen, however, has a largequadrate blackish spot on the face, in which respect it differs fromall specimens of furtivus examined. The host record, if correct,should leave little doubt that cookii represents a distinct species. Thefollowing notes are based on the type : Ocell-ocular line about twiceas long as the diameter of an ocellus; face and frons very minutelypunctate ; antennae broken ; thorax smooth and polished ; propodeum
akt. 8 REVISION OF THE GENUS MICROBRACON MUESEBECK 81polished; first abscissa of radius about as long as recurrent vein;the second hardly twice as long as the first; the third scarcely as longas the first and second combined; second intercubitus longer than therecurrent vein; chitinized plate of first abdominal tergite broadeningrather gradually posteriorly, rugulose apically and laterally ; second,third and fourth tergites granular, opaque; fifth tergite very finelygranular, shining; frons, vertex and occiput blackish except alongthe eyes; face with a large quadrate black spot; thorax entirelyblack ; wings very faintly dusky ; legs, including all coxae yellow, theposterior tibiae and tarsi more or less dusky ; first abdominal tergiteand a median spot on the second, black; the apical tergites some-what fuscous.Distribution.?Lansing, Michigan.Host.?" Leaf-miner in basswood."Known only from the unique type.SPECIES OF MICROBRACON NOT INCLUDED IN THE KEYMICROBRACON RUFOMARGINATUS (Ashmead)Brucon rufomarginatus Ashmead, Canad. Ent., vol. 25, 1S93, p. 08.Type.?I have been unable to locate the type of this species.Judged by the original description it is very similar to, possiblyidentical with, politiventris (Gtishman) ; if the type is found andproves to be politiventris, it will be necessary to place the latter namein synonymy.Type-locality.?Morgantown, West Virginia.Host.?Unknown.MICROBRACON PICEICEPS (Viereck)Bracon piceiceps Viereck, Trans. Kans. Acad. Sci., vol. 19, 1905, p. 268.Type.?In the University of Kansas.It has been impossible to place this species on the basis of theoriginal description and notes by Mr. Gahan who has examined thetype, principally because the type is a male specimen and males ofthe group to which this species belongs are exceedingly difficult toidentify. It appears to come nearest to mellitor.Type-locality.?Douglas County, Kansas.Host.?Unknown.SAY'S SPECIES OF THE GENUS BRACONWhen attempting to determine which of Say's species, described inthe genus Bracon, belong to Microbracon, it became necessary to re-view thoroughly all of the species placed in Bracon by Say; and itappears desirable to include in this paper a list of these species withthe names of the genera to which they seem to be referable. Some12053?25 6
82 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67
of them have long since been assigned to their proper genera but arenevertheless included here in order to make the list complete. Mr.A. B. Gahan, of the Bureau of Entomology, very kindly aided inthese determinations, and the following list expresses both his opinionand that of the writer. The species, the transfer of which haspreviously been published, are indicated by an asterisk.argutator Microbracon.*dorsator Microbracon.exhalans Doryctea.*explorator Cardiochiles.*hebetor Microbracon.honestor Spathius.inescator Spathius.*ligator Helconidea.*mellitor Microbracon.paululor Spathius.pectinator Odontobracon.populator Capitonius.
pullator Spathius.*rugator Campyloneurus.rugulosus Rogas.scrutator Rogas.stigma tor Rogas.
* thoracicus .__ Triaspis.Hibiator Cardiochiles.transversus Chrcmylus.*trilobatus Triaspis.truncator Zele.vestitor Rogas.*viator- - Cardiochiles.HOST LIST
Anthonomm albopilosus Dietz
?
eugenii Canofvlvus LeContegrandis Bohemansignatus Saysquamosus LeConte-Chrysobolhris deleta LeConteConotrachelus nenuphar HerbstDcsmoris scapalis LeConteGastroidea cyanea MelshGcraeus, speciesLaemosacGus, speciesListro-notus latiusculus Boheman_.Lixus scrobicollis BohemanOberea, species
v Orthoris crotchii LeConte? Phytonomus nigrirostris Fabri-eittsPissodes strobi PeckI'ityophthorus, speciesRhyssematus lineaticollis SaySphenophorus calloxiis OlivierTachyptcrus quadrigibbus SayTychius semisquamoxus LeConte.Tglodcrma fragariae Riley
COLEOPTEKAMicrobracon mellitor (Say).mellitor (Say).mellitor (Say).mellitor (Say).mellitor (Say).mellitor (Say).nevadensis (Asbmead )
.
variabilis (Provancher)
.
mellitor (Say).gastroideae ( Asbmead )
.
geraci Muesebeck.laemosacci Muesebeck.punctatus Muesebeck.lutus (Provancher).cerambycidiphagus Muesebeck.nuperus ( Cresson )
.
tenuiceps Muesebeck.pini Muesebeck.pityophthori Muesebeck.rhyssemati ( Asbmead )sphenophori Muesebeck.tachyptcri Muesebeck.variabilis (Provancher).tychii Muesebeck.analcidis (Asbmead).HYMKNOPTEBACephas I'iiicFiis Norton Microbracon cephi Gahan.En itra, species angclesius (Provancher).1 Priophorus acericaiilis McGilli-vray montowcsi Viereck.
AKT. 8 REVISION OF THE GENUS MICBOBBACON?MUESEBECK 83LEP1DOPTEBAAcrobasis mbulclia Riley MicrobracAegeria cxitioxa Saytipuliformis LinnaeusArchips argyrospila Walkerparalella RobinsonAristotelia abscoiidiUlla Walkerroscosuffu sella ClemensCanarisia hammondi RileyChilo. speciesColeophora leucochrysella Cle-mens volckei Heinrich
?
Coleophora, speciesCryptolechia , speciesDesmia funeralis HuebnerDiatraea, speciesDioryctria abietella ZinckEnarmonia prunivora WalshEphestia cahiritella Zellerelutella Huebnerkuchniella ZellerEtiella zinckcnella schisticolorZellerEulia triferana WalkerEuxoa, speciesOalleria melloneUa LinnaeusOelechia hibiscella BusckGelechia, speciesGnorimoschema gallacastericllaKellicott gallaesoHdagi-nis RileyHemimene plummerana BusckLaspcyresia molesta BusckMalacosoma constricta Packardphi via I is DyarMeromyza americana FitchMesocondyla gastrails GueneeMineola indiginclla ZellerMompha eloisclla ClemensNotolophus oslari BarnesPandemis lamprosana RobinsonPapaipema frigida Smithncbris GueneePapaipema, speciesPectinophora gossypiella Saun-dersPhthorimaea cinerella Murtfeldt-.operculella Zeller
on cushmani Muesebeck.sanninoideae Gahan.ses iae M uesebeck.gelechiac ( Ashmead )
.
politiventris (Cushinan)./>odi< n korum Viereek.gelechiac ( Ashmead )
.
cushman i Muesebeck.gelechiac (Ashmead).pyralidiphag u s Muesebeck
.
pygmaeus ( Provancher )
.
pygmaeus (Provancher).juncicola ( Ashmead )
.
pygmaeus ( Provancher )psilocorsi Viereek.gelechiae (Ashmead).pyralidiphagus Muesebeck.brevicornis ( Wesmael )
.
cushmani Muesebeck.hebetor (Say).hebetor (Sa.v).hebetor (Say).hyxlopi Viereek.politiventris ( Cushman )
.
erucarum ( Cushman)
.
hebetor (Say).gelechiae (Ashmead).gelcch iae ( Ashmead )furtirus (Fyles).furtivus (Fyles).hemimenae Rohwer.gelechiae (Ashmead).xanthonotus ( Ashmead )
.
xanthonotus ( Ashmead )
.
meromyzae (Gahan).cushmani Muesebeck.cushinan i Muesebeck.oenotherae Muesebeck.xanthonotus ( Ashmead )politiventris ( Cushman )papaipemae Gahan.lutus (Provancher).gelechiae (Ashmead).
mellitor (Say).platynotae ( Cushman )
.
gelechiac ( Ashmead )
.
gelechiae (Asbmead).
84 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 67Platynota, species Microbracon platynotae (Cushman).Plodia interpunctella Huebner hebetor (Say).Polyehrosis viteana Clemens gelechiae (Ashniead).mellitor (Say).politiventris ( Cushman )
.
variabilis (Provancher).Pyrausta ainsliei Heinrich caulicola Gahan.nubilalis Huebner caulicola Gahan.gelechiae ( Ashniead )
.
hebetor (Say).penitalis Grote ^__. caulicola Gabon.Saluria, species argutator (Say).Sitotroga cercalella Olivier hebetor (Say).Thurberiphaga diffusa Barnes, thurberiphagae Muesebeck.Vitula edmansii Packard hebetor (Say).Wanda baptisiella Fernald . gelechiae (Ashmead).EXPLANATION OF PLATESThe drawings on Plate 1 are by the writer. The photographs on Plate 2were taken by Mr. C. E. Hood, of the Bureau of Entomology.Plate 1Fig. 1. Microbracon gastroideae. Front view of head.2. Microbracon rudbeckiae. Lateral view of abdomen.3. Microbracon pygmaeus. Front view of bead.4. Microbracon mellitor. Dorsal view of abdomen.5. Microbracon melanaspis. Dorsal view of abdomen.6. Microbracon sphenophori. Lateral view of head.7. Microbracon tenuiceps. Lateral view of head.8. Microbracon sesiae. Lateral view of head.Plate 2Fig. 9. Microbracon sesiae. Anterior wing.10. Microbracon argutator. Anterior wing.11. Microbracon hemimenae. Anterior wing.12. Microbracon sanninoideae. Anterior wing.13. Microbracon caulicola. Anterior wing.14. Microbracon pini. Anterior wing.15. Microbracon ptigmaeus. Anterior wing.16. Microbracon cerambtjeidipliagus. Anterior wing:17. Microbracon cushmani. Anterior wing.18. Microbraeon mellitor. Anterior wing.19. Microbracon brevicomis. Anterior wing.20. Microbracon ceplii. Anterior wing.21. Microbracon tychii. Anterior wing.22. Microbracon mdbeckiae. Anterior wing.23. Microbracon gelechiae. Anterior wing.24. Microbracon crucarum. Anterior wing.25. Microbracon furtivus. Anterior wing.26. Microbracon xanthonotus. Anterior wing.
U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 67, ART. 8 PL. I
Details of MicrobraconFor explanation of plate see page 84
U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 67, ART. 3 PL. 2
Wings of Species of MicrobraconFor explanation of plate see page 84
SPECIES INDEX[Accepted specific names are In roman ; synonyms In Italics]Pageaequalis (Provan?her) 73americanus (Ashniead) 28analcidis (Ashmead) 59angelesius (Frovancher) 43anthonomi (Ashmead) 65apicatus (Frovancher) 64argutator (Say) 74nshmeadi Muesebeck 42atricollis (Ashmead) 58auripes (Provancher) 44brachynrus (Ashmead) 36brevicornis (Wesmael) 33canadensis (Ashmead) 79caulicola Gahan 72cecidomyiae (Ashmead) 43eephi Gahan 61cerambycidiphagus Muesebeck 76heneficientior (Viereck) 31ductus (Provancher) 77coleophorae Rohwer 38eonnecticutorum Viereck 40cookii (Ashmead) 80curtus (Provancher) 48cushmani Muesebeck 29diversicolor (Viereck) 27dorsator (Say) 31erucarum (Cushman) 27euurae (Ashmead) 43fungicola (Ashmead) 67furtivus (Fyles) 67gastroideae (Ashmead) 35gelechiae (Ashmead) 26geraei Muesebeck 74bebetor (Say) 31hemimenae Rohwer 61hobomok Viereck 71hopkinsi (Viereck) 30byslopi Viereck 49johannseni (Viereck) 26jurjlandis (Ashmead) 31juncl (Ashmead) 38juneicola (Ashmead) 37kansensis (Viereck) 38konkapoti Viereck 79laemosacci Muesebeck 56lixi (Ashmead) 75lutus (Provancher) 75mali (Viereck) 30ma8sasoit Viereck 38melanaspis (Ashmead) 36mellitor (Say) 65meromyzae (Gahan) 41
Pagemetacomet Viereck 57minimus (Cresson) 47montowesi Viereck 60nanus (Provancher) 65nawaasorum Viereck 58nevadensis (Ashmead) 54niger (Provancher) 73nlgridorsum (Ashmead) 41nigropectus (Provancher) 67nitidus (Provancher) 50notaticeps (Ashmead) 26nuperus (Cresson) 47oenotherae Muesebeck 62papaipemae Gahan 63pembertoni Bridwell 65piceiceps (Viereck) 81pini Muesebeck 52pityophthori Muesebeck 55platynotae (Cushman) 29podunkorum Viereck 59politiventris (Cushman) 37politum (Ashmead) 42politus (Provancher) 47psilocorsi Viereck? 40punctatus Muesebeck 24pygmaeus (Provancher) 38pyralidiphagus Muesebeck 34rpiinnipiacorum Viereck 24rhyssemati (Ashmead) 80rudbeckiae Muesebeck 45rufomarglnatus (Ashmead) 81sanninoideae Gahan 70scanticorum Viereck 33scbequanash Viereck 37sesiae Muesebeck 53sphenophori Muesebeck 25sulcifrons (Ashmead) 78tachypteri Muesebeck 68tenuiceps Muesebeck 46tetralophae (Viereck) 26thurberiphagae Muesebeck 54tortricicola (Ashmead) 69trifolli (Ashmead) 38tychii Muesebeck 51uucas Viereck 43variabilis (Cushman) 29variabilis (Provancher) 69vernoniae (Ashmead) 65wawequa Viereck 78xanthonotus (Ashmead) 30xanthostigmus (Cresson) 65
85o