A REVISION OF THE NORTH AMERICAN ICHNEUMON-FLIES OF THE GENIUS MESOSTENUS AND RELATEDGENERA By R. A. CusHMANOf the Bureau of Entomology, United States Department of Agriculture Ashmead's tribe Mesostenini was separated off from the Crj-^tini onthe basis of the small alar areolet (fig. 6) of its members and an in-definable general appearance or habitus. As I have heretoforepointed out ^ I cannot agree with Ashmead and those who follow himthat these differences are of sufficient strength to justify the separa-tion. Certain of the genera, which, because of the small areolet,must be placed in the Mesostenini if that tribe is maintained are muchless closely related to Mesostenus than to other genera in which theareolet is large. For example, the new genus, Agoywcryptus^ de-scribed beyond, is very closely related to Echthrus Gravenhorst andto certain Oriental genera (for example, Megacryptus Szepligeti,andTorhda Cameron) in clypeal, tibial, and abdominal characters, where-as only its small areolet allies it to Mesostenus.The insects here treated constitute the North American representa-tives of the tribe Mesostenini of Ashmead.KEY TO GENERA TREATED 1. Spiracles of first segment before middle ; front tibia in female inflated andbasally constricted ; seventh tergite in female much longer than sixth,eighth long and scoop-shaped ; head narrowed beliind eyes, the templesnarrow, clieeks swollen and much broader than temples ; clypeus broadlytruncate, not medially dentate; mandible with lower tooth larger andlonger than upper ; propodeum long, with two transverse cai'inae ; firsttergite in female short and stout, hind tibia nearly or quite a half longerthan femur, longer calcarium not reaching middle of basitarsus ; tarsusshorter than tibia, apical joint hardly as long as second ; ovipositor muchshorter than abdomen (figs. 2a, Zh, Qa, 7) Agonocryptus, new genus.Spiracles of first segment at or behind middle ; not agreeing entirelyotherwise with above 2 * Joum. Wash. Acad. Sci., vol. 15, 1925, p. 389.No. 2761.?Proceedings U. S. National Museum, Vol. 74, Art. 165927?29 1 1 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 74 , Spiracles of first segment at or not far behind middle (fig. 2b-d), the seg-ment in female either narrow throughout or subclavate; propodeumwith more or less distinct basal carina, but with apical carina wantingor at most faintly indicated laterally (fig. 3c and I) 3Spiracles of first segment far behind middle (fig. 2e-h) 4Clypeus broadly truncate without an apical tooth ; first segment sublinear,curved, the spiracle at or slightly behind middle (fig. 2b) ; propodeum(fig. 3c) shining, posteriorly evenly transversely striate; longer hindcalcarium reaching beyond middle of basitarsus (fig. 7).Messatoporus, new genus. Fig. 1. ? Head of: a. Listkognathus albomaculatus (Crbsson), Doe-sal View ; ft. Same, Lateral View of Lowee Part to Show OccipitalCaeina (oc) and Htpostomal Caeina {he) ; c. Listrognathcs agnatdsCdshman, Lateral View of Lowee Part ; d. Polyaenus spinaeius(BEULLfi), Dorsal View; e. Mesostenus leucopus Ashmead, DorsalView ; f. Polycyrtus neglectos Cdshman, Dorsal View ; ff. Poly-cyktidea limitis Cushman, Dorsal ViewClypeus medially angulate or toothed ; first segment subclavate, straight, thespiracles slightly behind middle (fig. 2c-d) ; propodeum (fig. 31) very long,posteriorly opaque rugoso-punctate ; longer hind calcarium not or barelyreaching middle or basitarsus Mallochia Viereck.4. Propodeum not completely areolated, nearly or quite without longitudinalcarinae, rarely with areola more or less defined 5Propodeum nearly completely areolated (fig. 3m) Polistiphaga Cushman.5. Postpetiole in female broad, the stemite not or barely reaching the spir-acles (fig. 2e-f), in male sternite rarely reaching beyond spiracles andthen only slightly beyond 6Postpetiole in female naiTOw, the sternite reaching distinctly beyond thespiracles (fig. 2g-h), in male far beyond, if not so the areolet is verylong and narrow 9 ABT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 6. Frons with a single stout horu, rarely imlLsthict (fig. la), abdomen stronglyand coarsely punctate Listrognathus Tschek.Irons unarmed or with two minute horns or with a more or less promi-nent median carina ; abdomen very finely coriaceous and not or veryweakly punctate 7 v<>AAf=\^ TfA.C Fig. 2. ? First Abdominal Segment of Female : a. Agono-CRYI'Xns DISCOIDALOIDES (ViERECK), LATERAL ViEW ; 6.Messatopords discoidalis (Cresson), Lateral View;c. Mallochia agenioides Viereck, Dorsal View ; d. Same,Lateral View ; e. Listrognathus albomaculatus, Lat-eral View; f. Crypturopsis audax (Cresson), DorsalView ; g. Mesostencs leucopus Ashmead, Dorsal Vibw ;h. Same, Lateral View 7. Areolet pentagonal in position, intercubiti convergent, open at apex, thecubitus bent forward at recurrent and backward at second intercubitus(or its normal position), sometimes subobsolete beyond recurrent, recur-rent at or before middle of areolet (fig. Qf and f;)_Diapetimorpha Viercck.Areolet elongate or quadrate, intercubiti parallel (sometimes open atapex), recurrent usually much closer to second intercubitus (or itsnormal position) than to first, cubitus beyond recurrent straight ornearly so (fig. 6 h and i) 88. Frons mutic Crypturopsis Ashmead.Frons bicornute (fig. Id) Polyaenus Cresson.9. Second discoidal cell neither pointed nor strongly narrowed at base 10Second discoidal cell pointed or very narrow at base (fig. 5) 12 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 74c^ Fig. 3. ? Propodedm of Female : a. Cryptdropsis abdominalis Cushman ; 6.AGONOCRYPTUS DISCOIDALOIDES (VIERECK) ; C. MESSATOPORUS DISCOIDALIS (Cres-SON) ; d. LiSTROGNATHUS ALBOMACDLATDS (CRESSON) ; e. LiSTROGNATHUS AGNA-Tus Cushman; f. Diapetimorpha introita (Cresson) ; g. DerocentrusMACILBNTUS (CRESSON) ; h. POLYCYRTUS NEGLECTUS CuSHMAN ; i. ACERASTERpertinax (Cresson) ; j. Mesostenus thoracicds (Cresson) ; k. PolyaendsSPINARIDS (BRULLfi) ; I. MALLOCHIA AGENIOIDES VIERECK ; m. POLISTIPHAQAZONATA CDSHMAN ART. 18 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 10. Frons unai-med, but frequently witli a median carina that, seen fi-om above,muy appear as a small horn (lig. le), propodeuin without distinctapophyses though frequently with apical carina hif,'h (fig. 3 g and /)__ 11Frons with a stout horn (lig. !/), propodeum with strong apophyses (fig. 37i).Polycyrtus Spinola. Pio. 4. ? Hind Trochanter and Pemce of:o. Dkrocbntrus macilentus (Crbsson) ;5. Mesostenus thoracicus Cresson nAc.Fig. 5. ? Fore Wing of Ackiu\stes pke-TiNAx (Cresson) 11. Hind trochautella not longer than trochanter (fig. 46), ovipositor shorterthan body Mesostenus Gravenhorst.Hind trochantellu much longer than trochanter (fig. 4a), ovipositor muchlonger than body Derocentrus Cushman.^^^ -0^- n-AcCiFio. 6. ? The Areolet of: a. Agonocryptds discoidaloides (Viereck) ; 5. Messa-TOPORus DiscoiDALis (Cresson) ; c. Messatoporus major Cushman ; d. Mai.lo-CHIA AGENIOIDES ViERF.CK ; ?. LiSTROGNATHUS ALBOMACDLATUS (CUESSON); f.DiAPETIMORPHA ORBA (SAY) ; g. DiAPETIMORPHA INTROITA (CRESSON) ; h. CRYP-TUROPSIS TEXANUS (ASHMEAD) ; t. POLYABNUS SPINAUIUS (BrULLE) \ j. MeSOSTBNUS THORACICUS CrESSON ; fc. POLYCYRTUS NEGLECTUS CUSHMAN ; I. DEROCEN-TRUS MACILENTUS (CrESSON) ; 111. I'OLYCYRTIDEA LIMITIS CUSHMAN ; n. ACERASTESPEBTiNAx (Cresson) ; o. Polistiphaga fulva (Cresson) 12. Frons (fig. \g) with a stout horn; areolet (fig. Qm) not defined, secondintercubitus missing, radius, first intercubitus and recurrent very closetogether, nervellus inclivous Polycyrtidea Viereck,Frons mutic; areolet (fig. 6?) pentagonal in position, second intercubitusmissing, cubitus subobsolete beyond recurrent; nervellus reclivous.Acerastes, new genus. b PROCEEDINGS OF THE NATIONAL MUSEUM vol.74AGONOCRYPTUS, new genus'Closely related to the Neotropical Monogonocryptus Viereck andDigonocryptus Viereck, but both of those genera have the spiracle ofthe first abdominal segment behind the middle, the nervulus nearlyor quite interstitial, and the clypeus apically more or less distinctlydentate, Monogon.oanjptus with ctfie tooth and Digonocrijptus ^ withtwo teeth. Otherwise these two genera agree very well with thefollowing description of Agonocryptus.Clypeus inflexed apically and very broadly truncate, mutic ; labrumbroadly exposed ; mandibles with lower tooth larger and longer thanupper; head narrowed behind eyes, temples narrow, cheeks swollenand much broader than temples ; eyes large and prominent ; antennaelong and slender filiform, scape deeply, obliquely truncate ; flagellumin female slightly flattened in about the basal half, bas^ joints verylong, others successively shorter, apical joint truncate at apex;thorax subcylindrical ; notauli deep anteriorly, disappearing in aroughly sculptured area in middle of mesocutum; scutellum weaklyconvex, not margined; sternauli distinct, propodeum long, with twotransverse carinae widely separated, without longitudinal carinae orapophyses, roundly sloping from basal carina, spiracles broadly oval ; legs not especially slender, front tibia in female inflated, and basallyconstricted; hind tibia nearly or quite a half longer than femur,longer calcarium not reaching middle of basitarsus, tarsus distinctlyshorter than tibia, apical joint in female hardly as long as second, inmale but little longer than fourth ; stigma very narrow, radius beforemiddle; discoidal cell not conspicuously narrowed at base; areoletsmall pentagonal, rather longer than high, intercubiti parallel, sec-ond intercubitus obsolete, recurrent at or slightly beyond middle;nervulus distinctly antefureal, perpendicular to medius; nervellussharply broken, strongly reclivous, its upper abscissa perpendicularto mediella; abdomen in female lanceolate, in male narrowly sub-clavate and not apically compressed, sx)iracles of first segment beforemiddle; in female, first segment stout, decurved, with a blunt toothon either side below near base, seventh tergite fully as long as thirdeighth prominent and scoop-shaped; hypoygium far before apex;ovipositor much shorter than abdomen, deep and bladelike.Genotype.?Mesosterius discoidaloides Viereck. To this genus alsobelong the following Netropical species : ? o-yo?'ia=without angle, referring to the lack of a tooth on margin of clypeus, by which it is distin-guished from some of its closest relatives. * To this genus, in addition to the genotype, belong the following Neotropical species : (Mesostcnus) Digonocryptus tarsatus (Cresson) (new combination).(Mesostenus) Digonocryptus grenadensis (Ashmead) (new combination).(Mesostenus insularis Ashmead, not insularis [Cresson] Ashmea.A) = (Mesostenus)Digonoc7-yptus cressonii (Ashmead) (new combination). ABT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN(Mesosteniis) Agonocryptus chichimecus (Cresson) (new combina-tion).{Cryptus) Agonocryptus heathi (Brues) (new combination).AGONOCRYPTUS DISCOIDALOIDES (Vicreck) (new combinaUon)Figs. 2a, 3&, 6a, 7Mcsosienus discoidaloides Viereck, Ti"ins. Kansas Acad. Sci., vol. 19, 1905,p. 319, female. Type.?Kans. Univ. Coll.Discussion based on seven specimen^ of each sex in the NationalCollection determined by the author from Viereck's descriptionand from notes on the typeby A. B. Gahan.FeTihole.? Face veryslightly narrower thanfrons, two-thirds as longas broad, usually more orless obliquely rugulose oneacli side above ; malarspace three-fourths basalwidth of mandible; diame-ter of lateral ocellus two-thirds ocell - ocular line.Thorax coarsely punctate,rugose in pronotal andmesopleural impressions ; propodeum transversely ru-gose in middle betweencarinae, apical area longi-tudinally so ; n e r V e 1 1 u sbroken at or somewhatabove middle. Abdomencoarsely and rather denselypunctate, more finely andsparsely so at apex; firsttergite sparsely so, pobshedat base and apex, two- . 1 . T 1 T , Fig. 7. ? Agonocbyptus discoidaloides (Viebbck)thirds as broad at apex aslong ; second tergite distinctly longer than broad at base ; ovipositorsheath half as long as abdomen.Black with j^rofuse yellow markings; head yellow except mandi-ables at apex, spot in malar space extending up to clypeal fovae,middle of frons and vertex, and occiput which are black or blackish ; antenna black with a small spot on scape and a broad annulus cen-tering at about the eighth joint yellow; thorax yellow as follows:Pronotum dorsally and ventrally, propleurum, round or oval median 8 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 spot on mesoscutum, scutellum and postscutellum, subalar tubercle,spot below hind wing, lower part of mesopleurum only partially sep-arated from sternum by a black streak along sternaulus (prepectusblack) ; upper and lower divisions of metapleurum largely, and atrifoliate spot covering entire apical slope and position of areolaon propodeum; coxae and basal joint of trochanters yellow andblack; legs otherwise pale testaceous except hind tarsi, which areyellow with extreme base testaceous and apical two joints blackish;wings hyaline, faintly infumate at apex, venation blackish, stigmareddish ; all tergites broadly yellow laterally and all but last apically,first also basally.Male.?More slender than female with malar space shorter, facenarrower, thorax more slender; antennal annulus centering on aboutthe eleventh "joint ; yellow of head, thorax, and legs somewhat moreextensive; hind tibia at apex and basitarsus at base black, tarsusexcepting claws otherwise white; abdomen narrower, first and sec-ond tergites three or more times as long as broad at their junction,beyond second tergite more or less red with apical yellow bands lessdistinct and sometimes obliterated.The type is from Kansas.The National collection specimens bear data as follows : One female,Lawrence, Kans., August 3, 1896, Hugo Kahl; one female, northernIllinois; one female, Pennsylvania; one female, French Creek, W.Va., reared from larva of PseudobicUon unicolor under QuaintanceNo. 1285, F. E. Brooks; one female, one male, Victoria, Tex., HunterNo. 267, A. C. Morgan ; one female, Calvert, Tex., G, H. Harris ; onemale. Liberty, Tex., March 18, 1906, E. S. Tucker; one male, Jack-sonville, Tex., October 11, 1905, C. R. Jones; one male, Texas, Bel-frage; two males. Piano, Tex., reared December 12, 1908, fromEuyogonius vestitus Say under Hunter No. 1698, E. S. Tucker; onefemale, Gainesville, Fla., "eel. No. lc-5c," H. L. Dozier; one male,Palm Beach, Fla., H. G. Dyar.MESSATOPORUS, new genus*Clypeus broadly truncate at apex, mutic; labrum prominent;mandibles long and apically very narrow, upper tooth larger andlonger than lower; head strongly narrowed behind ej'es, cheeks notswollen ; eyes large and prominent, malar space very short ; antennaeas long as body, slender, scape deeply obliquely truncate, flagellumwith basal joints long and slender, others gradually shorter towardapex, flagellum apically sometimes flattened; especially in female;thorax much deeper than broad, notauli deep, nearly parallel formost of their length but curving sharply posteriorly and meeting in < From /teo-craT-os = quite in the middle, and 7ropos= opening, referring to the location of the spiraclesof the first abdominal segment. ART. 16 NORTH AMERICAN ICHNEUMON-FLIES?CUSHMAN 9a deep depression at about the posterior third of the mesoscutum ; seutelhim convex, not margined; sternauli deep, complete; propodeumrather long, with the basal carina strong and nearly straight andapical carina absent or slightly indicated laterally, without longitudi-nal carinae, basad of basal carina polished, strongly transverselystriate beyond, spiracles elongate; legs slender, hind coxae large,front tibia in female slightly inflated and weakly constricted basally,hind tibia not nearly a half longer than femur, longer calcariumreaching far beyond middle of basitarsus, tarsus subequal in lengthto tibia, apical joint in female hardly as long as third, in male littlelonger than fourth ; fourth joint of all tarsi, especially in female andespecially on front tarsus prolonged on outer side below ; stigma verynarroAv, radius slightly before middle; discoidal cell not conspicu-ously narrowed at base; areolet small, pentagonal, about as long asliigh, intercubiti parallel or nearly, second intercubitus obsolete, re-current at or beyond middle; nervulus distinctly antefureal, perpen-dicular to medius or slightly inclivous; nervellus sharply broken,strongly reclivous, upper abscissa perpendicular to mediella ; ab-domen in both sexes broadest distinctly beyond middle, first segmentslender, decurved, spiracles at or very near the middle ; apical tergitesin female not conspicuously long; ovipositor sheath shorter thanabdomen, ovipositor slender cylindrical.Genotype.?Mesostenus discoidalis Cresson.The four North American species known to me are distinguishableby the following key:1. Clypeus not apically inflexed ; antennae not at all compressed apically ; pro-podeum with lateral traces of apical carinae; subdiscoideus below upperthird of postnervulus 2Clypeus apically inflexed ; antennae apically compressed, more strongly so infemale; propodeum without trace of apical carina; subdiscoideus at orabove upper third of postnervulus 32. Abdomen with alternate bands of black and white discoidalis (Cresson).Abdomen red, bases of segments usually more or less darker, first segmentwhitish at base and apex rufiventris, new species.3. Eyes distinctly convergent below compressicornis, new species.Eyes hardly convergent below major, new species.MESSATOPORUS DISCOIDALIS (Cresson) (new combination)Figs. 2&, 3c, 66, 8.Mesostenus discoidalis Cees.son, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 162.female. Type?Cat. No. 1575, U.S.N.M.Mesostenus jocosiis Provanciier, Nat. Can., vol. 6, 1874, p. 300. female; Nat.Can., vol. 11, 1870. p. 112. female; Faune Ent. Can. Hymn., 1883. p. 346,female. Type.?Public Mus. Quebec (new synonymy).Discussion based on type and 10 other females and 8 males, all inthe National collection.Length, 8-9 mm.5927?29 2 10 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 74Temples nearly flat; occipital carina not very prominent; vertexbehind ocelli only slightly higher than at posterior ocelli; fronsweakly impressed in middle ; eyes convergent below in about the ratio5:4; combined face and clypeus very slightly longer than broad,face rather densely finely punctate with a distinct longitudinal im-pression on each side of mid-dle; clypeus nearly half aslong as interfoveal line, slop-ing toward apex but not dis-tinctly inflexed, broadly trun-cate at apex; antennae aslong as body; flagellum cy-lindrical throughout, slightlythicker toward apex. Thoraxshining but not polished,rather densely finely punc-tate, foveolate along the lat-eral sutures and sternauli,pronotal and subalar impres-sions striate ; scuteilum weak-ly convex; apical carina ofpropodeum more or less dis-tinct laterally; subdiscoideusbelow upper third of postner-vulus; coxae opaque, denselyand finely punctate. Abdo-men, except first tergite, sub-opaque, very finely coria-ceous; ovipositor sheath aslong as abdomen exclusive offirst tergite.Black with profuse paleyellow or white markings asfollows : Broad uninterruptedorbits, face, clypeus, mandi-bles at base, scape in front,broad annulus on flagellumcentering on joints 10-11, up-per and anterior margins of pronotum, propleura largely, spot on disk.of mesoscutum sometimes prolonged toward the front along notauli,scuteilum and its basal carinae, pleura and mesopleurum and meta-and mesosternum except more or less broadly along sutures andusually sternauli, metasternum entirely, upper division of meta-pleurum confluent with a median spot behind postscutellum, pro-podeum behind carina except oval median apical spot, base of first Fig. 8. ? Messatoporus discoidalis (Cresson) AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES?CUSHMAN 11 segment, broad apices of tergites 1-7 and 8 except in middle above ; front leg stramineous with more or less distinct darker streaks onupper surface of trochanter and femur and flexor surface of tibia,and frequently on upper surface of coxa ; middle leg more testaceouswith dark markings faint or absent; hind leg testaceous, coxa withupper surface yellowish and flanked on outer side toward base by adark streak, tibia near base more or less distinctly pale, at apex andbasitarsus at base black, tarsus otherwise white, calcaria apicallymore or less, usually largely, white ; wings hyaline, veins dark, stigmapale.Male.?Smaller and more slender, and less distinctly sculpturedand more polished than female ; face narrower and eyes less stronglyconvergent; annulus centering on flagellar joints 13-14; front andmiddle legs and hind coxae paler ; hind tibia white at base, black atapex, and only obscurely red in middle ; tergites more or less red be-tween basal black and apical white.The National collection specimens bear the following data: Typeand three other specimens, Texas, Belfrage ; Victoria, Tex., two speci-mens, J. D. Mitchell, one reared March 23, 1909, " from mud-wasp,"and one reared January 10, 1916, under Hunter No. 3748-1 fromAgenia petiol-ata (Cresson) ; one, Dallas, Tex., April 24, 1907, F. C.Bishopp; one, Kansas; one, Riley County, Kans., May 25, F. Marlatt;one, Boulder, Colo., September, Cockerell ; one, Rockford, 111., rearedDecember 17, 1920, from Ceropales fraterna; one, Plummer Island,Md., June 25, 1920, H. S. Barber; one Cabin John, Md., September 13,1917, R. M. Fouts ; one, Georgetown,, D. C, H. H. Smith ; one, Car-lisle Junction, Pa., August 28, 1909, W. S. Fisher; one, Durham, N.H., Weed and Fiske ; and two without locality, reared, one on April24, 1884,, from Agenia l)07iibycisa by T. Pergande, and one from oldnest of Scelifhroii caeTnentariuTJi inhabited by Psevdagenia meUipes.MESSATOPORUS RUFIVENTRIS. new speciesStructurally I can see na difference between this and dlscoidalis(Cresson), and am inclined to think it merely a color variation. Butin the absence of a good variation series I deem' it wiser to describeit as distinct. One of the specimens was compared by S. A. Rohwerwith the type of Mesostenus jocttsus Provancher and determined byhim as that species in spite of the difference in abdominal coloration.Female.?Length, 8 mm.Differs from dlscoidalis practically only in color of abdomen, whichis red with tergites more or less darker at base, the first yellow at baseand apex.Type-locality.?Cabin John, Md.Type.?Cat.' No. 40579, U.S.N.M. 12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74Nine females showing about the same distribution as discoldalis.Type taken August 5, 1917, by K. M. Fouts; two, Glen Echo, R. M.Fouts; one, Glencarlyn, Va., August 18, 1912, J, R. Malloch; oneLangdale, Ala., H. H. Smith; one, Texas, Belfrage; one, BoulderCounty, Colo,, May 9, 1926, Charles H. Hicks, under his No. 150;one, Quebec Province, Canada; and one without data.MESSATOPORUS COMPRESSICORNIS, new speciesThis and the following species are very easily distinguishable fromthe other two species by the characters used in the key, especially intheir distinctly compressed antennae.Female.?Length, 9 mm.Temples rather strongly convex; occipital carina high; vertexbehind ocelli distinctly higher than at posterior ocelli; frons with adeep median groove; eyes convergent below in the ratio 5:4; com-bined face and clypeus barely as long as broad, face distinctly sha-greened and very sparsely punctate; clypeus barely a third as longas interfoveal line, distinctly inflexed from middle and with a dis-tinct reflexed margin, apex very broadly and slightly concavely trun-cate; antennae as long as body, flagellum very slender at base,strongly flattened toward apex. Thorax polished, at most verysparsely punctate, sternauli and prepectal suture not foveolate, meso-pleural groove foveolate, pronotal impression striate, subalar im-pression smooth; scutellum strongly convex; apical carina entirelywanting; subdiscoideus above upper third of postnervulus ; coxaepolished, sparsely and coarsely punctate. Abdomen subpolished;sheath as long as abdomen beyond first tergite.Color and color pattern much as in discoiddlis., but differing asfollows: Scape not pale in front; antennal annulus centering onseventh flagellar joint; several of the sutures of flagellum beyondthe annulus with a small white sjDot on outer side below; post-scutellum pale; all coxae pale yellow with larger or smaller blackmarkings above and below; front and middle trochanters and basaljoint of hind trochanter j^ellow, the middle and hind ones black atbase; front and middle femora testaceous; front and middle tibiaeand tarsi stramineous ; hind tibia testaceous, paler at base and blackat apex; hind tarsus white, extreme base black; calcaria black,apically reddish.Male.?More slender than female; face narrower; flagellum lessstrongly compressed at apex ; scajDe pale in front ; annulus centeringon flagellar joint 10; front and middle legs paler and practicallywithout black markings; apical joint of hind trochanter largelyblack, tibia black and white. ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 13Type-locality.?Inglenook, Pa.AUotype-locaXity.?Speeceville, Pa.Typ?.?Q2it. No. 40580, U.S.N.M.Five females and one male as follows: Type taken in August byJ. N. Knull; allotype July 8, 1909, by P.^ R. Myers; District ofColumbia, July and August; Thomasville, Alabama, April 20, 1910,W. D. Pierce. MESSATOPORUS MAJOR, new speciesFig. Cc ;Very closely related to cotiipressicornis and perhaps only a largespecimen of that species differing slightly in structure of head andcolor of legs as follows:Female.?Length, 13 mm.Eyes only very slightly convergent below ; front and middle tibiaetestaceous, middle tarsi fusco-testaceous ; sheath very nearly as longas abdomen.Type-locality.?Orlando, Fla.Type.?Csit. No. 40581, U.S.N.M.One female, October 13, 1925, O. C. McBride.Genus MALLOCHIA ViereckMallochia Viereck, Proc. U. S. Nat. Mus., vol. 43, 1912, p. 591. Genotype.?Mallochia ageniodes Viereck. ^Head transverse, temples convexly narrowed; clypeus small, ar-cuately truncate and medially more or less distinctly toothed at apex ; eyes large, somewhat bulging; frons unarmed; mandibles short, up-per tooth slightly larger and longer than lower ; scape obliquely trun-cate ; flagellum filiform, in female somewhat thickened toward apex.Thorax long subcylindrical, propodeum very long with basal carinaobsolete to distinct, other carinae absent, spiracles small circular;notauli distinct anteriorly but not deep ; sternauli obsolete ; scutellumnearly flat; wings narrow, stigma small, radius slightly before mid-dle, radial cell short, areolet small pentagonal, cubitus beyond sec-ond recurrent and second intercubitus weak, nervulus antefurcal,subdiscoideus far above middle of postnervulus, nervellus stronglyreclivous, its u])per abscissa perpendicular to cubitella ; legs long andslender, longer hind calcarium not or barely half as long as basitar-sus, front tibia in female neither inflated nor basally constricted.Abdomen long fusiform in female, very narrow and subclavate inmale; first segment short, straight, gradually widened toward apex,spiracles slightly behind middle; apical tergites in female short;ovipositor sheath much shorter than abdomen ; thin, sagittate at apex. 14 PROCEEDINGS OP THE NATIONAL MUSEUM vol.74The two North American species are distinguishable as follows : 1. Head behind eyes much narrower than at eyes ; front wings bifasciate ; female only . agenioides Viereck.Head behind eyes nearly as broad as at eyes; wings hyaline throughout;male only strigosa (Cresson).MALLOCHIA AGENIOmES ViereckFigs. 2c-d, 3?, 6dMallocJida agenioides Viereck, Proc. U. S. Nat. Mus., vol. 43, 1912, p. 591, female.Type.?Cat. No. 15036, U.S.N.M.Observations based on type and one other female.Female.?Temples much narrower than eyes, their cephalo-caudadlength little more than a third the shortest diameter of eye ; occipitalcarina joining hypostomal carina some distance behind mandible;cheeks much broader than temples; vertex, frons, face, and clypeusbasally closely and finely punctate ; clypeus half as long as interfovealline; malar space three-fourths basal width of mandible; antennaetwo-thirds as long as body, first four flagellar joints elongate andsuccessively gradually shorter, fifth abrutly shorter, subapical jointsabout as long as thick. Thorax twice as long as deep, finely andclosely punctate, pronotal depression striate, scutellum polished;propodeum rather steeply sloping apically, opaque, finely rugulosepunctate, basal carina obsolete. Abdomen finely punctate opaque,first tergite nearly polished, very faintly shagreened; first tergitetwo and a half times as long as broad at apex, postpetiole slightlylonger than broad; second tergite twice as long as broad at base;ovipositor sheath half as long as abdomen.Ferruginous with orbits, face, clypeus, mandibles basally, pro-pleura, front legs, and scutellum paler; mandibles apically, ovi-positor sheath, and apical joint of hind tarsus blackish; flagellumbeyond middle of first joint blackish with an incomplete whiteannulus centering on joint 7; wings hyaline with transverse cloudsin front wing opposite apex of costa and apex of radius.The second specimen was captured May 27, 1911, at Anacostia,D. C, by P. R. Myers.MALLOCHIA STRIGOSA (Cresson) (new combination)Mcsoleptus ? strigosus Cresson, Trans. Amer. Ent. Soc, vcd. 4, 1872, p. 167,male. Type.?Cat. No. 1604, U.S.N.M.Oausocontrus ? strigosus (Cresson) Davis, Trans. Amer. Ent. Soc, vol. 24, 1897,p. 311, male.Neniatopodius longicaudus Ashmead, Proc. Wash. Acad. Sci., vol. 4. 1902, p. 201,male (not female).The unique type from Texas is the only known specimen of thisspecies. AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 15Except for its broader temples and hyaline wings it differs fromagenioides Viereck markedly only in its much more slender body andI suspect it is the male of that species. The temples are about halfas long as shortest diameter of eye ; the thorax about three times aslong as deep with the propodeum sloping very gradually to apex;the first tergite is fully three times and the second nearly four timesas long as broad at their junction ; the hind coxae are very long andslender ; and the antennae without a white annulus.Genus LISTROGNATHUS TschekListrognathus Tschek, Verh. Zool.-bot, Ges. Wien, vol. 20, 1870, p. 153. Geno-type.?Listrognathus cornutus Tschek.Mcsostenoideus Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 45. Oeno-typc.?Mesostcntis alhomamilatMS Cresson.Idstrognathus (Tschek) Cushman, Journ. Wash. Acad. Sci., vol. 15, 1925, p.390.Viereck's synonymizing of Mesostenoideus with Polycyrtus Spi-nola is obviously incorrect, as I have previously pointed out.As I have shown in the reference cited above the type of Meso-stenoideus will not run to that genus in Ashmead's key because ofthe frontal horn.Quit6 as characteristic of this genus as the frontal horn is thecoarse, dense abdominal punctuation.Temples strongly, obliquely narrowed; frons usually with a dis-tinct horn, rarely with only the trace of such a horn; eyes parallelAvithin or nearly so, clypeus convex, usually very strongly elevated,at base, transversely impressed at apex; malar space long; occipitalcarina usually very prominent behind cheeks ; hypostomal carina veryhigh; antennae long, slender, flagellum in female slightly thickenedand flattened below toward apex, first joint much longer than second,which is slightly longer than third, fourth much shorter than third,in male flagellum tapering beyond middle, joints gradually shorterfrom base. Thorax stout, about twice as long as deep and slightlydeeper than broad, densely and coarsely punctate with propodeumusuall}' more or less rugose; upper margins of jDronotum swollenand anteriorly carinately angled by the epomia; notauli distinct andcomplete, scutcllum margined only at extreme base, convex, polishedand at most sparsely punctate; sternauli deep anteriorly, obsoleteposteriorly; propodeum with both transverse carinae and frequentlywith median carinae more or less indicated between the transvei-secarinae, apical carina sometimes obsolete medially, apophyses welldeveloped or indicated by strong elevations in apical carina, spiracleselongate or oval; areolet subquadrate or subpentagonal, closed, re-current near apex; nervulus antefureal; postnervulus broken below 16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74middle; nervellus broken below middle, its upper abscissa nearly orquite perpendicular to cubitella; legs slender, front tibia in femalenot inflated. Abdomen fusiform, narrower in male, coarsely punc-tate, first tergite bent, postpetiole broad, usually with a prominentflange-like carina on lower margin; sheath much shorter thanabdomen.The North American species may be distinguished by the follow-ing key : 1. Occipital carina prominently toothed a short distance before reaching liypo-stt.mal carina ? (fig. 16) ; abdomen black, the tergites conspicuously bandedwith white apically albomaculatus (Cresson).Occipital carina not prominently toothed (fig. Ic) ; abdomen red on blackwith at most the apical tergites narrowly white apically 22. Apical carina obsolete medially or much weaker than at apophyses ; areolawanting ; apical tergites margined with white multicolor, new species.Apical carina of pi'opodeum distinct throughout, apophyses not much strongerthan middle; areola more or less defined (fig. 3e) ; apical tergites notmargined with white 33. Frontal horn black agnatus, new species.Frontal horn white paludatus (Cresson).LISTROGNATHUS ALBOMACULATUS (Cresson)Synonymy and description under varietal heading.A very variable species that is divisible on the basis of specimensstudied, into five more or less distinct varieties, recognizable by thefollowing key : 1. Lower division of metapleurum partly white 2Lower division of metapleurum entirely black 32. Hind tibia and basitarsus red rufitibialis, new variety.Hind tibia black or blackish with a subbasal yellow annulus, basitarsusyellow multimaculatus, new variety.3. Hind coxae red and white ; fore wing in female with a distinct cloud belowstigma variety nubilipennis (Cresson).Hind coxae black or black and white 44. White bands of abdomen in female, at least on tergites 2 and 3 interrupted atsides ; mesoscutum immaculate, mesopleurum nearly or quite so ; face infemale medially immaculate ; antenna in male without white annulus.variety sagax (Provaucher).White abdominal bands entire ; mesoscutum and mesopleurum with whitespots ; face in female usually more or less white medially ; antenna in malewith white annulus variety albomaculatus (Cresson).LISTROGNATHUS ALBOMACULATUS variety ALBOMACULATUS (Cresson)Figs, la-b, 2e, 3d, GeMesostenus albomaculatus Cresson, Proc. Ent. Soc. Philadelphia, vol. 3, 18&4,p. 313, female.?AsHMEAD, Smith; Ins. of N. J., (1899) 1900, p. 570.Type.?No. 1108, Acad. Nat. Sci. Phila. s The carina running backward from the ventral articulation of the mandible along theouter side of maxilla. ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 17Mesostenus levcocoxus Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 407.male. T/zpc?Cat No. 2019, U.S.N.M.Mesostcnoidcus albomaculatus (Crcsson) Ashmead, Proe. U^ S. Nat. Mus., vol.23, 1900, p. 45.Polycyrtus albomacxilatux (Cres-son) ViiniECK, Proc. U. S. Nat. Mus., vol. 42,1012. p. C)44.McsostcnidCit iPolijcijrius) albomaculata (Cresson) Viereck, Hym. Conn.,(1916) 1917, pp. 329 and 330.Listrognathus alboinaculatus (Cresson) Cusiiman, Journ. Wash. Acad. Sci.,vol. 15, 1295, p. 391.Listroffuathus Jcucocoxus (Ashmead) Cushman, Journ. Wash. Acad. Sci., vol.15, 1925, p. 391.Discussion based on type, a specimen compared with the type bythe writer, type of leucocoxus, and nine other females and two othermales.Female.?Length, 8-12 mm.Temples and vertex behind ocelli sharply sloping, densely andcoarsely punctate; frons medially irregularly rugose; face mediallyrugose punctate; inner orbits and malar space finely coriaceous andsparsely punctate; eyes parallel; malar .space about three-fourthsas long as basal width of mandible, occipital carina very prominentbelow; clypeus very prominent; antennae nearly as long as body,fourth flagellar joint three-fourths as long as third. Thorax coarse-ly, mostly confluently punctate, pronotum laterally and mesopleurumabove striately rugose; scutellum subpolished, sparsely punctate;propodeum reticulate rugose ; apical carina obsolete medially, apophy-ses prominent. Basal tergites punctate, postpetiole coarsely andrather sparsely so, second coarsely and confluently so; apical tergitepolished, impunctate; sheath hardly half as long as abdomen; ovi-positor stout, compressed, depressed beyond dorsal angle.Black with whitish markings as follows : Orbits except behind topof eyes; usually tAvo small spots on middle of face, sometimes want-ing and sometimes confluent; clypeus basally; spot on upper marginof mandible; broad, ventrajly incomplete, annulus, centering abouton joint 8 or 9 of flagellum and usually a spot on under side ofscape; anterior and humeral margins of pronotum, median sp()ton mesoscutum; scutellum largely and postcutellum ; tegulae; subalartubercle; a large mark below on mesopleurum; upper division ofmetapleurum; a large longitudinal mark on each side of posteriorface of propodeum including the apophyses; and apical bands ontergites 1-6, those on 2 and 3 not interrupted laterally, extreme apexof 2 narrowly black; wings yellowish hyaline, sometimes with afaint trace of a cloud below stigma, venation dark brown; legs tes-taceous; front and middle coxae largely whitish, more or less blackat base and sometimes at apex above; hind coxa black with a whit-ish spot above, hind knees black, tibia blackish, pale subbasall}^;5927?29 3 18 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74tarsus white, basitarsus with a more or less distinct dark subbasalannulus, apical joint red.Male.?Much ^ike female but antennae slightly longer than bodyand with annulus centering about on flagellar joint 14 or 15 andscape entirely white below; face entirely, clypeus and mandiblesexcept apex whitish; seventh tergite also white at apex.The type is from Pennsylvania and that of leueocoxus from Mis-souri. The other United States National Museum specimens are asfollows: A female, Castje Rock, Pa., September 7, 1901; a male,Lyme, Conn., May 18, 1918, W. S. Fisher; five females. Cabin John,Md., July 1-August 21, R. M. Fonts; a female. Glen Echo, Md.,September 17, 1918, R. M. Fonts; a female, Virginia, August 5, 1883,T. Pergande; a female, Wooster, Ohio, June 1, 1897; one male,Urbana, 111., July 15, 1893, Hugo Kahl; and a female. Cadet, Mo.,J. G. Barlow.LISTROGNATHUS ALBOMACULATUS RUFITIBIALIS, new varietyFemale and Triale.?A southern variety extending as far north onthe Atlantic Coast as New Jersey. Differing from all other varietiesin its red hind tibia and basitarsus and from all but multimaculatusin the white maculate lower division of metapleurum. The yellowmarldngs are somewhat more extensive than in the typical form ; inthe female the median facial spot is usually confluent with the orbitalring.Type-locality.?Plummer Island, Md.Allotype-locdlity.?Heckton Mills, Pa.Type.?Q2it. No. 40582, U.S.N.M.Described from three females and seven males, the type takenJuly 21, 1920, by H. S. Barber and the allotype June 6, 1909, by W. S.Fisher; a male with same data as allotype except May 21, 1909; afemale, Lucaston, N. J., August 27, 1905 ; a male, Pyziton, Ala., H. H.Smith; two males, Dallas, Tex, April 8, 1906, F. C. Bishopp, andMarch 6, 1907, R. A. Cushman; two males, Piano, Tex., October andNovember, E. S. Tucker; and one female, Lawrence, Kans., HugoKahl. LISTROGNATHUS ALBOMACULATUS MULTIMACULATUS, new rarietyFemale.?Differs from the typical form in the possession of a largewhite spot on lower division of metapleurum ; in the generally some-what larger spots, especially noticeable on the face, where the medianspot is usually confluent with the orbital markings; orbital ringsometimes complete; hind tibia black at apex, this color grading offto fuscous red toward base ; hind basitarsus entirely white.Type-locality.?Carlisle Junction, Pennsylvania.Type.?C2it. No. 40583, U.S.N.M. AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 19Three females, the type captured August 28, 1909, by W. S. Fisher ; one from New York; and one from Riley County, Kans., November,Marlatt.LISTKOGNATHUS ALBOMACULATUS variety NUBILIPENNIS (CrcMon)Mcsostenus nubilipentiis Ceesson, Can. Ent., vol. 10, 1878, p. 205. Type.?No.1184, Acad. Nat. Sci. Phila.Discussion based on type.Differs from typical form in having the hind coxae largely redand in having a distinct, though not deeply infumate, cloud in thefront wing,Cresson says " frons unarmed ", but the structure of the frons isthe same as in specimens with the horn. There is great variationin the size of the horn, and the reduction in size is apparentlycarried to the extreme in this specimen.A male from Vienna, Va., April 22, 1915 (R. A. Cushman), whichI have somewhat doubtfully determined as this variety has a dis-tinct frontal horn, lacks the alar cloud, and has the hind coxae redand only slightly paler above.The type is from Georgia.LISTKOGNATHUS ALBOMACULATUS variety SAGAX (Provancher)Mesostenus sagax Provancheb, Nat. Can., vol. 11, 1879, p. 112, fig. 2e, female;Faune Ent. Can. Hym., 1883, p. 345, fig. 35e, female. Ti/pe.?PublicMuseum, Quebec.Discussion based on notes by S. A. Rohwer on type and threefemales and one male in the National collection determined by thewriter.According to Rohwer's notes the type will run in Ashmead's keyto Mesostenoideus, which would indicate that the frons is unarmed,but one of the females in the National collection agrees so nearlyperfectly with Provancher's description and with the additionalcharacters in Rohwer's notes that the determination appears correct.So identified this form is probably nothing but a more or lessmelanic variation of the species hardly worthy of varietal rank.In its extreme form as represented by the type the head is entirelywithout white markings; on the thorax only the scutejlum andapophyses are white marked; and the coxae are entirely black.In the National Museum specimen that approaches closest to thetype in coloration the frontal orbits are narrowly white; there aresmall white spots on dorsal margin of pronotum, base of tegula,subalar tubercle, and upper side of middle coxa. In the most higlilyornamented specimen these markings are larger, the orbital markextends to the sides of the face, and there are additional whitemarkings on cheeks, clypeus, mandibles, lower corner of pronotum. 20 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.74lower margin of mesopleurum, postscutellum, upper division of meta-pleurum and all coxae.The only characters in which all agree and in which they differfrom the typical variety are the interrupted apical bands of tergites2 and 3 and the mediajily immaculate face.In the male the orbits are more broadly white from frons aroundto cheeks, the face is medially white, clypeus and mandibles partlywhite, scape white below, flagellum entirely black; tegulae, humeralmargin of pronotum, subalar tubercle, postscutellum, front andmiddle coxae and trochanters beneath white ; front and middle coxaeand trochanters above, hind coxa and basal joint of trochanter en-tirely, apex of femur, basal and apical joints of tarsus black; secondjoint of hind tarsus dusky; apical bands of tergites 2 and 3 not in-terrupted ; seventh tergite apically white.The type is from Cap Rouge, Quebec; the most nearly typical fe-male of the National collection and the male from Edmonton, Al-berta, April 5, 1924, George Salt ; and the two other females fromCanada (C. F. Baker collection) ; and Lyme, Conn., June 15, 1918,W. Middleton. LISTROGNATHUS MULTICOLOR, new speciesFemale.?^Length 8 mm.Temples strongly sloping, straight, distinctly, though not densely,punctate; frons medially rugose above, polished below, horn large;face finely alutaceous, coarsely punctate; clypeus moderately ele-vated; malar space subequal to basal width of mandible; occipitalcarina not prominent below; antennae nearly as long as body.Thorax densely and coarsely punctate, pronotum laterally, mesopleu-rum and metapleurum partly, rugoso-striate ; propodeum with apicalcarina obsolete medially, apophyses low carinate, obliquely striaterugose between the carinae, posterior face reticulate rugose ; nervulusdistinctly antefureal ; nervellus perpendicular to cubitella. Abdomendensely, rather coarsely punctate on tergites 2-3, postpetiole sparselypunctate; sheath hardly half as long as abdomen; ovipositor as inalhomaculatus.Head and thorax black with the following white markings; an-terior orbits, very narrow on face ; a spot on cheek ; middle of clypeus ; spot on mandible; upper side of ninth flagellar joint; small spots onhumeral margin of pronotum, tegula, subalar tubercle, and scutellumand a spot on each side of posterior face of propodeum, includingapophyses ; wings yellowish hyaline ; legs testaceous ; front and mid-dle coxae more or less whitish above ; hind tibia dusky red, blackishat Base and apex, with an indefinite yellowish subbasal annulus;tarsus dusky, basal and apical joints nearly black, joints 1-4 pale at ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 21base ; abdomen ferruginous, apical tergites more or less black, tergites4?7 with narrow white margins.Ti/pe-Jocality.?California.Type.?C?it, No. 40584, U.S.N.M.Two females, the paratype from Kaslo, British Columbia (R. P.Currie).The paratype is smaller than the type. It lacks the orbital mark-ings on sides of face and on cheeks; clypeus is only faintly maculateand the mandibles entirely black; the antennal annulus occupiesjoints 9-11 ; the spots on the thorax are smaller, and those on thesubalar tubercles and propodeum are wanting; and the fourth tergitelacks the apical white band.LISTROGNATHUS AGNATUS, new speciesFigs. Ic, 3eFemale.?Length, 8 mm.Head rather thick antero-posteriorly, the temples convexly oblique,strongly punctate; frons polished, almost without sculpture, hornfairly large ; face slightly widening below, coriaceous, medially ratherdensely punctate; clypeus convex basally, but not especially promi-nent ; malar space about three-fourths basal width of mandible ; occi-pital carina not prominent below; antennae (broken). Thoraxrather more finely sculptured than usual for the genus; propodeumwith both basal and apical carinae distinct throughout and with theareola obsoletely defined laterally, about as long as broad with cos-tulae near base, apophyses low carinate, apical slope flat; nervulusstrongly antefureal; nervellus slightly inclivous, its upper abscissaobliijue to cubitella. Abdominal sculpture rather finer than usual,*postpetiole shining, punctate only around margins and these sparselyso; sheath little more than a third as long as abdomen; ovipositorrather slender, slightly compressed, dorsal margin beyond anglestraight.Black ; narrow frontal orbits and sometimes narrower facial orbits,humeral margins of pronotum, tegulae, subalar tubercles, spot onscutellum, sometimes a spot on each side of posterior face of pro-podeum and joints 2?i of hind tarsus white; hind femur at apex,tibia, and basitarsus black, the tibia indefinitely paler subbasally;wings hyaline, venation brown, stigma paler; abdomen black, firsttergite very dark reddish picoous, second and third very narrowlymargined with pale reddish.Type-locality.?Southern Illinois.Type.?C'^it' ^o. 40585, U.S.N.M.Three females, none entire.These bear an Ashmead manuscript name indicating an associa-tion witli the lopidopterous genus Orgyia. 22 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 74LISTROGNATHUS PALUDATUS (Cresson)Mesostenus paludatusi Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 162, male.Type.?No. 1185, Acad. Nat. Sci. Phila.Discussion based on the unique male type and a female in theNational Co^ection somewhat doubtfully determined by the writeras this species.Immediately recognizable by its white frontal horn.Male.?The type differs from the female of agnatus in having thehead longer behind the eyes with the temples more strongly convex;6yes widely divergent below.Head and thorax black; frontal horn, anterior and lower poste-rior orbits, face, mouth parts, scape in front, collar, humeral marginsof pronotum, median spot on mesoscutum, scutellum, tegulae, subalartubercle, and a spot near lower margin of mesopleurum white;flagellum black above, reddish beneath; propodeum ferruginous,stained with black basajly and in apical middle, with a white markon each side of apical face; legs testaceous, front and middle coxae,front trochanters, and joints 2-4 of hind tarsi white; hind femurand tibia apically and basal and apical joints of tarsus black; abdo-men ferruginous, tergites beyond fifth black.The female mentioned above, which is without locality label, isof the same form and structure and abdominal coloration as thatof agnatus but is somewhat larger (10 mm.) with more whitemarkings. From the type of fokidatus it differs structurally in thesame way as does agnatus. In color it differs as follows: faceexcept a small median spot above, black ; orbits, interrupted in malarspace; anterior margin of pronotum and mesoscutum immaculate;propodeum black, the apical face white with a large median blackspot, the edges of the black more or less reddish as is also the apexof the metapleurum ; front and middle legs entirely testaceous exceptfor dorsal whitish spots on coxae; abdomen black with only thefirst, and to a lesser extent the second tergite reddish piceous, secondand third narrowly pale reddish at apex.Genus CRYPTUROPSIS AshmeadCrypttirus Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 413, (notfiravenhorst).Crypturopsis Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 45. Genotype.?Crypturus texanus Ashmead.Head strongly narrowed behind, temples short; occipital carinastrongly sinuate and prominent behind cheeks, joining the hypo-stomal carina far back of mandible ; frons unarmed but with a more ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 23 or less distinct median carina, medially impressed or flattenedimmediately before front ocellus; malar space rather lon*^; clypeustruncate, convex with a rather broad reflexed margin ; labrum ex-posed; upper tooth of mandible larger and longer than lower;antennae of moderate length, rather stout, in female slightly thickerand flattened below toward apex, first three flagellar joints long,fourth abruptly shorter, in male tapering, flagellar joints graduallyshorter from base toward apex. Thorax stout, strongly sculptured ; upper margin of pronotum swollen on each side of middle; notauliusually distinct anteriorly, sometimes obsolete; scutellum flat orweakly convex without distinct lateral carinae, lateral areas coarselystriate; prepectal carina and sternauli complete, the latter foveolate;propodeum short, precipitate behind, basal carina distinct, apophysesrounded, spiracles large, oval; hind legs long, stout; stigma narrow,radius before middle; areolet quadrate in position open behind,cubitus nearly straight beyond recurrent; nervulus nearly or quiteinterstitial; postnervu-lus broken at or slightly above the middle;norvellus broken near the bottom. Abdomen in female broad fusi-form, in male very small and apically more or less distinctly com-pressed; postpetiole, especially in female, broad, spiracles far beyondmiddle of segment; sheath much shorter than abdomen; ovipositorstout, compressed, subsagittate and serrate both above and belowat apex.Seven North American species are known, distinguishable by thefollowing key:1. Hind coxae red or red and yellow 2Hind coxae "black and yellow or black, red, and yellow 52. Notauli obsolete ; first tergite pale with a black spot on postpetiole.texanus (Aslimead).Notauli distinct ; first tergite red with or without yellow apical band 33. Anterior and posterior orbits broadly yellow, thorax profusely marked withyellow, mesopleurum largely yellow audax (Cressou).Orbits at most narrowly yellow ; thorax with only small yellow spots, meso-pleurum very largely or entirely black 44. Orbits narrowly yellow ; metapleurum immaculate ; second tergite red at apex.saundersi (Cresson).Orbits immaculate; metapleurum marked with yellow, second tergite yellowat apex ?armatus (Provancher).5. Abdomen black and white 6Abdomen red abdominalis, new species.6. Mesosternum with only a small yellow spot on each side near sternauli ; diameter of ocelli in male little more than half ocell-ocular line.candidus (Cresson)Mesosternum in female with a large yellow spot on each side of middle, thetwo forming a jew's-harp-shaped figure, in male largely yellow; diameterof ocelli in the male fully three-fourths ocell-ocular line fortis (Cresson). 24 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.74CRYPTUROPSIS TEXANUS (Ashmead)Fig. 6ft.Crypturus tcxanus Ashmel^d, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 413, ina,Ie,Ti/pe.?Cat. No. 2034, U.S.N.M.Crypturus dyari Ashmead, Can. Ent, vol. 29, 1897, p. 113, female, male. ? Dyar, Journ. N. Y. Ent, Soc, vol. 5, 1897, p. 126. Type.?G&t No. 3649,U.S.N.M. (new synonymy).Crypturopsis texanus Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 45Daixa Torre, Cat. Hym., 1901-1902, p. 536.{Crypturopsis) dyari Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 45.Crypturopsis dyari (Ashmead) Dalla Torre:, Cat. Hym., 1901-1902, p. 536.Differs from all other North American species by its obsoletenotauli, these being indicated anteriorly by coarser sculpture.Discussion based on types of both names, allotype and two femaleparatypes of dyari, another male from the same source as the typeof dyari, and five other specimens of each sex.The female dyari bearing the name label in Ashmead's hand ishereby designated the lectotype of that name.-The color difference between the males noted by Aslimead is moreapparent than real, the reddish markings of texanus being due tostaining. The slight differences in the color of the hind legs arevariational.Female.?^Length 7-12 mm.Eyes nearly parallel within, slightly sinuate opposite antennae,face slightly broadening below; head subtly shagreened; frontalorbits, postvertex, temples and cheeks sparsely punctate; vertex andfrons rugose, frons above regularly transversely so, scrobes arcuatelyrugose; face, clypeus and malar space densely punctate, middle offace somewhat rugulose; malar space subequal to basal width ofmandible; antennae two-thirds as long as body, first flagellar jointslightly longer than second, third subequal to second, fourth a littlemore than half as long as third. Pronotum above pmictate, theswollen area nearly smooth, impression and along lateral margincoarsely striate; mesoscutum punctate, the interspaces shagreened,positions of notauli and prescutellar area rugose ; scutellum polishedwith scattered punctures; mesopleurum shining; rugulose above,punctate below, speculum polished, striate anteriorly; sternumdensely punctate; sternauli coarsely foveolate; upper division ofmetapleurum punctate, its lower division and the propodeum irreg-ularly rugose, basal areas partly shagreened; apophyses polished;postnervulus broken distinctly above middle. Abdomen opaque, veryfinely coriaceous, first tergite polished; sheath nearly as long asabdomen exclusive of first tergite.Black with whitish markings as follows : Broad orbits interruptedon temples; middle of face (sometimes entire face) ; convex por-tion of clypeus ; occasionally base of mandible ; annulus on flagellum ART. 16 NORTH AMERICAN ICHNEUMON-FLrES?CUSHMAN 25beginning on fourth joint and centering on about seventh or eighth ; anterior margin of pronotuni and dorsal swellings; two lines onmesocutum; scutellum and basal carinae; postscutellum ; subalartubercle and a large mark below speculum; tegulae; large spots onupper and lower divisions of metapleurum; apophyses and usuallya spot on each side of basal middle of propodeum ; first tergite excepta spot on disk of postpetiole, and broad apical bands on all othertergites except last; legs testaceous, hind tarsi stramineous, blackat apex ; w-ings hyaline, venation blackish, stigma stramineous.Male.?Except sexually essentially like female, but without anten-nal annulus, eyes convergent below, front legs paler, and hind legsexcept coxae darker; hind trochanters more or less, upper surface offemur frequently, tibia except base, which is whitish, and tarsuspiceous to black.The most notew^orthy variation is in the comparative width of thefemale abdomen; in the types of dya7% which were parasitic in theshort oval cocoons of Al^rocUa sJossoniae (Packard), the abdomenis especially broad.The type of texanics is from Texas (Belfrage) and those of dyarifrom Florida, reared by Dr. H. G. Dyar, as was also one other male.The other National Museum specimens are as follows: Florida?Gainesville, September 13, 1923, T. H. Hubbell (one specimen) ; Mic-cosuke, April 27, 1924, T. H. Hubbell (one specimen) ; Biscayne Bay(one specimen) ; one specimen labelled simply Florida. Louisiana ? Crowley, August 29, 1911, E. S. Tucker (one specimen). AlabamaPysiton, Clay County, H. H. Smith (two specimens). Texas?Piano,October, E. S. Tucker (two specimens) ; Victoria, April 28, 1904, W.E. Hinds (one specimen).CRYPTUROPSIS AUDAX (Cresson) (new combination)Fig 2fMcsostenus audax Cresson, Can. Eut., vol. 10, 1878, p. 207, female. Type.?No.1172, Acad. Nat. Sci. Phila.Mesostcnus exaptus Cresson, Can, Ent., vol. 10, 1878, p. 208, female. Type.?No.1176, Acad. Nat. Sci. Phila.Mesostenidea exapta (Cresson) Vibkeck, Hym. Conn. (191G) 1917, p. 329.Discussion based on types of both names, a specimen in theNational collection compared with both types by the writer, andseven other females.The two types differ apparently only in size and coarseness ofsculpture and exhibit minor differences in extent of color. The speci-men compared with the types is intermediate in these respects betweenthe two.Female.?Length 7-14 mm.Differs from texanus essentially as follows. Face slightly narrowerthan frons, barely widening below, eyes hardly at all sinuate opposite5927?29 4 26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74antennae; frons irregularly rugose above, scrobes with striae radi-ating from antennal foramina; face less densely punctate, clypeusand malar space sparsely so; antennae about three-fourths as longas body, fourth flagellar joint two-thirds as long as third. Notaulidistinct anteriorly; inner margins of lateral lobes polished andalmost impunctate; lower division of metapleurum coarsely punctatebut not rugose ; propodeum reticulate rugose ; apophyses compressed ; postnervulus broken very nearly at middle.Head and thorax colored as in texanus except that there is a whitishspot on mesosternum along sternaulus, the spots on scutellar carinaeare usually and those at base of propodeum apparently always lack-ing, and the spots covering the apophyses are much larger ; abdomenas in texanus except first tergite red with apex whitish; black andwhitish on second tergite separated by an irregular reddish streak;hind coxa red, whitish below and at base above, tarsus red apically.The male is unknown, unless, as I suspect, it is candidus (Cresson).The type of audax is from Georgia, that of exaptus from Massa-chusetts. The National Museum material is as follows: Lucaston,N. J., October 10, 1902 (one specimen compared with types), Penn-sylvania?Carlisle Junction, August 28, 1909, W. S. Fisher; Ingle-nook, September 10, 1909, A. B. Champlain. Maryland?Baltimore ; Cabin John, September 7, 1917, R. M. Fonts; Plummer Island,October 12, 1906, A. K. Fisher. Virginia?Great Falls, September12, 1912, A. N. Caudell. Alabama?Pyziton, Clay County, H. H.Smith.None of the National Museum specimens is quite so large as thetype of audax nor quite so small as that of exaptus, but they form agood variation series between the two.CRYPTUROPSIS SAUNDERSI (Cresson) (new combination)Mesostenus saundersi Cresson, Can. Ent., vol. 10, 1878, p. 208, female. Type.?No. 1187, Acad. Nat. Sci. Phila.Much like audax but head and thorax much less extensively markedwith whitish and first tergite entirely and second apically red.Known only from the unique type, which is from " Canada West."CRYPTUROPSIS? ARMATUS (Provancher) (new combination)Mesostenus armatus Peovancher, Addit. Faune Ent. Can. Hym., 1889, p. 76,female.Otacustes armatus (Provancher) Davis, Can. Ent., vol. 27, 1895, p. 288. Type.?Coll. W. H. Harrington.The transfer of this species to Cryptoropsis is on the strength ofa note on the type by S. A. Rohwer, which says that it runs inAshmead's key very satisfactorily to this genus. The species assigned AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 27in the present paper to Diapetimiovplia also run in Ashmead toCrypturopsis^ and it may be that aiinatxis should be assigned there.Rohwer's notes do not mention the form of the areolct, nor does theoriad in both sexesblack and white, the pale orbits not interrupted at top of eyes; maleantenna without pale annulus 5 30 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74Olypeus rather strongly convex, with a distinct reflexed margin ; mesoscutumimmaculate or with a single median spot; head in female unicolorous, inmale black and yellow, pale orbits interrupted at top of eye ; male antennawith a pale annulus 75. Thorax not at all red rufigaster, new species.Thorax partly or entirely red 66. Pronotum and mesoscutum black and white confederata, new species.Pronotum and mesoscutum largely red alabama, new species.7. Thorax in female red, in male red and yellow; a small species.acadia, new species.Thorax in female black, in male black and yellow ; a large species.introita (Cresson).DIAPETIMORPHA ORBA (Say) (new combination)Fig. 6fCryptus orbus Say, Boston Journ. Nat. Hist., vol. 1, 1835, p. 231 (LeCk?nteed., vol. 2, p. 688). T^/pe.?Lost; neotype in U.S.N.M.Hemiteles orbus (Say) Walsh, Can. Ent., vol. 2, 1869, p. 9. ? Cbesson, Synop.Hym. No. Amer., 1887, p. 199.Mesostenus diliffens Cbesson, Can. Ent., vol. 10, 1878, p. 207, female. Type.?No. 1175, Acad. Nat. Sci. Phila.Lymeon annuUcomis Ashmead, Ins. Life, vol. 7, 1894, p. 243, female. Type.?Cat. No. 1462, U.S.N.M.Crypturopsis annulicornis (Ashnread) Cushman, Proc. U. S. Nat. Mus., vol. 55,1919, p. 521. (Possibly synonymous with diligens.)Crypturopsis orbus (Say) Cushman and Gahan, Proc. Ent. Soc. Wash., vol.23, 1921, p. 162.Has very much the appearance of a species of Crypturo'psis butwith areolet distinctly pentagonal.Discussion based on neotype of orbus., type and homotype (Vier-eck) of diligens., type of annulicornis., and 13 other females and 6other males, all except the type of diligens in the United StatesNational Museum.Fetnal-e.?Length, 5-9 mm.Head very finely (coriaceous, temples and cheeks subpolished, fronsand vertex medially rugulose; face sparsely punctate and somewhatrugulose just below antennae, with a shallow impression on each sideof middle just above clypeus. Temples very narrow and nearly flat ; cheeks swollen; occipital carina slightly sinuate below; clypeusstrongly convex with a distinct reflexed margin; malar space two-thirds basal width of mandible ; upper tooth of mandible larger andlonger than lower ; flagellum slender, neither thickened nor flattenedbelow toward apex, joint 1 about six times as long as thick, 2 and 3somewhat shorter and subequal, 4 a little more than half as long as3, others successively shorter. Thorax shining; pronotal impressionstriate; mesoscutum opaque coriaceous, middle of disk irregularlylongitudinally striate, prescutum sparsely punctate, notauli foveo-late ; scutellum polished, not margined ; mesopleurum partly and all ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 31 of metapleurum more or less distinctly obliquely striate, propodeumreticulate-rugose, striately so in middle posteriorly, apophyses thick,subtuberculate, apical carina otherwise entirely lacking, spiraclessmall oval; areolet somewhat shorter than high; nervulus antefur-eal ; postnervulus broken above middle ; nervellus distinctly inclivous,broken far below middle; legs slender, front tibia subinflated. Ab-domen broadly fusiform, finely opaque coriaceous, first tergite pol-ished, petiole broad, depressed, second tergite densely finely punc-tate ; sheath less than half as long as abdomen, ovipositor stout, com-pressed, apex subsagittate.Black with very profuse white markings as follows: Head (ex-cept occiput, a median band on vertex and frons, apices of mandiblesand clypeus, and sometimes the clypeal suture) ; antennal annuluscentering on flagellar joint 7; propleura below; broad humeral mar-gins and collar of pronotum ; two lines on mesoscutum ; scutellum andits basal carinae ; postscutellum ; tegulae ; mesopleurum and sternumexcejDt along sutures and impressions; both upper and lower divi-sions of metapleurum ; a broad band on each side of propodeum frombasal carina to apex and enclosing the apophyses; base and apex offirst tergite and broad apices of others ; wings hyaline ; legs testaceous,front coxae and trochanters, middle coxae, dorsal spot on hind coxa,and hind tarsus except blackish apical joint whitish.Male.?More slender than female, subpolished, the sculpture muchweaker throughout ; temples broader and more strongly convex ; api-cal carina more or less distinct throughout and without apophyses;abdomen very narrowly fusiform.Clypeus entirely white ; antennae without annulus ; hind coxa whitewith a black stripe above; trochanter largely black; tibia fuscouswith a paler dorsal streak, which sometimes encircles the tibia; tar-sus black at extreme base and apex, otherwise white; apex of thirdand entire fourth tergite reddish.The normal host for this species is apparently the egg-sacs ofspiders, many of the specimens examined having been reared fromthe egg-sacs of Drassidae; but there are two specimens said to havebeen reared from lepidoptera, one from Laspeyresla fiiolesta Busckand one from a case-bearer on smartweed.The type of orhus was from Indiana; that of diligens from Illi-nois; and that of amMiIicornis from Mississippi. The other speci-mens studied are as follows : Four females and two males, includingthe neotype of orhus and the homotype of diligent., Twining, Md.,April, 1898, ex-egg-sacs of {P7'ostheswia)=Z?lotes sp., A. Busck;two females and one male from the same or a similar host, withoutlocality label but reared by Theodore Pergande probably from nearWashington ; one female. Glen Echo, Md., July, 1923, R. M. Fouts ; 32 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74one male, Washington, D. C, 1917, parasite of Laspeyresia molesta,Quaintance No. 1345^ E. R. Selkregg; one female, Chain Bridge,Va., June 14, S. A. Eohwer ; one female, Dead Run, Va., September29, 1912, H. L. Viereck; one male, Virginia, July 16, 1880, T. Per-gande; one female, Pyziton, Ala., H, H. Smith; one female, St.Catherine's Island, Ga. ; one male, Forbing, La., March 24, 1908,R. A. Cushman; one female, Dallas, Tex., April 17, 1906, W. W.Yothers; one female, Victoria, Tex., April 22, 1907, R. A. Cushman;one male, St. Louis, Mo., ex-case-bearer on smartweed, June 23, 1876(Riley collection) ; and one female without data.DIAPETIMORPHA CINCTIVENTRIS, new nameMesostenus latidnotus Cresson, Can. Ent., vol. 10, 1878, p. 208, female (notWalker). Type.?No. 1181, Acad. Nat. Sci. Phila.Mesostenus cressonii Dalla Torrp:, Cat. Hym., 1901, p. 539 (not Ashmead).Ashmead used the combination Mesosterms cressonii in 1900 for thepreoccupied Mesostenus insidaris (Cresson). Cresson never de-scribed a Mesostenine under the name insularis, and the only possibleinference is that Ashmead misread Mesoleptfus insularis Cresson asMesostenus insularis. Mesoleptus iiisularis Cresson isi certainly nota Mesostenine, but Ashmead's use of the combination Mesostenuscressonii antedates that of Dalla Torre and renders a new name forthe present species necessary.Discussion based on type and a specimen compared with the typeby Cushman.Female.?Length, 9 mm.Distinct from orha., which it superficially resembles rather closely,by single median mesothoracic spot and by the following characters : Face densely punctate, cheeks and temples sparsely so; teeth ofmandible equal ; flagellum distinctly thickened and flattened belowbeyond middle and tapering toward apex, the basal joints hardly asslender; mesoscutum densely, finely punctate, opaque, mesopleurmndensely, finely punctate, striate only in impressions; metapleurummore coarsely punctate, propodeum finely reticulate rugose withoutan}^ striation apically, apophyses small, acute; front tibia not at allinflated. Abdomen narroAver, especially the first tergite, the petioleslender cylindrical ; second tergite impunctate.Clypeus entirely white, mesoscutum with a single median spot,first tergite white only at apex; hind coxa white, black below at baseand at apex above; joints 1 and 4 of hind tarsus red, 2 and 3 white,5 black.The type is from Louisiana and the United States National Mu-seum specimen from Easley, S. C, J. O. Pepper, collector. ABT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 33DIAPETIMORPHA RUFIGASTER, new speciesFemale.?Length, 8 mm.Temples very strongly narrowed and nearly flat, subpolislu-d;cheeks subpolished convex, not swollen, lower end of occipital carinanot at all sinuate or prominent; frons finely coriaceous; face veryslightly narrower than frons, densely finely punctate, almost flatwithout distinct impressions; clypeus not strongly convex, withouta reflexed margin, apex rounded ; malar space two-thirds as long asbasal width of mandible, teeth of mandible subcqual; antennae aslong as body; flagellum very slender, slightly thickened in middle,joint 1 longest, 2 slightly longer than 3, 4 two-thirds as long as 3,others successively gradually shorter. Thorax anteriorly and dor-sally shining, laterally and posteriorly opaque; pronotum striate inimpressions, polished along margins; mesoscutum with fine, sepa-rated punctures, notauli fine anteriorly, soon becoming obsolete;scutellum polished, margined laterally in basal half; mesopleurumand sternum densely finely punctate, metapleurum somewhat morecoarsely so, mesopleurum somewhat striate above, speculum polished ; propodeum with basal carina strong, apical weak but distinct, apophy-ses long, compressed, basal areas finely rugulose, middle areasreticulate rugose, apical areas transversely rugulose, spiracles smalloval ; cubitus obsolete beyond second recurrent ; nervulus interstitialpostnervulus broken above middle; nervellus reclivous, broken atmiddle, its upper (ibscissa perpendicular to cubitella ; legs slender,front tibia not at all inflated. Abdomen only a little longer thanhead and thorax, subclavate; first tergite slender, polished, post-petiole gradually widening toward apex; second tergite twice aslong as broad at base and nearly twice as wdde at apex, this and fol-lowing tergites finely coriaceous; sheath as long as abdomen exclu-sive of first tergite ; ovipositor slender, compressed, sagittate at apex.Head and thorax black and yellowish white, legs and abdomenlargely red; orbits except narrow interruption on malar space, mid-dle of face, clypeus largely, incomplete annulus on flagellum center-ing on seventh joint, humeral margin and collar of pronotum, twolines on middle of mesoscutum and a small spot near each lateralmargin, tegulae, subalar tubercle, a spot above speculum, a large spotcovering lower part of mesopleurum and side of sternum and par-tially divided by sternaulus, scutellum, postscutellum, both upper andlower divisions of metapleurum, a small spot on each side of pro-podeum near base and a broad stripe on each side from basal carinato apex enclosing the apophyses, front coxae and trochanters, middlecoxae, apex of first tergite and of seventh tergite yellowish white; 34 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.74 apices of second and third tergites indefinitely pale; antennae black,piceous at base; wings hyaline, veins brown, stigma stramineous.Type-locality.?Potomac Creek, Va.Type.?Csit. No. 40587, U.S.N.M.One specimen, taken May 22, 1896.DIAPETIMORPHA CONFEDERATA, new speciesRelated to I'ufigaster^ from the above description of which it differsas follows:Female.?Length, 10 mm.Joint 4 of flagellum little more than half as long as 3; thoraxopaque throughout; mesoscutum finely coriaceous with some stria-tions along notauli and in posterior middle; scutellum marginednearly to apex; mesopleurum finely rugulose-punctate, metapleurummore coarsely so; venation as in ruflgaster except that nervulus isslightly antefureal and nervellus broken below middle; abdomenfusiform, postpetiole and base of second tergite broader, the latterless than twice as long as broad at base ; ovipositor stout.Head and thorax anteriorly black and white, thorax below andposteriorly and propodeum, abdomen and legs red ; head as in rufi-gaster except that face is not medially white ; pronotum, mesoscutum,scutellum, and postscutellum as in ruflgaster except lateral spots onmesoscutum are lacking, prepectus black ; mesopleurum, mesoscutum,upper division of metapleurum, and apophyses paler reddish or yel-lowish ; abdomen as in 7%ifiga^ter with apical . tergites somewhatdarker; legs entirely red, the front and middle coxae slightly paler;front wing with a pale cloud or band below stigma.Type-locality.?Dallas, Tex.Type.?Csit. No. 40588, U.S.N.M.Two females, the type captured October 20, 1906, by W. D. Pierce,and the paratype, in which the right hind leg and both antennae aremissing, from Biscayne Bay, Fla., where it was probably taken byAnnie T. Slosson.The red of the paratype is much darker than that of the type.DIAPETIMORPHA ALABAMA, new speciesIn structure and sculpture very much like confederata., but thoraxwithout black except along sutures of prothorax and mesonotum;wings immaculate. May be a pale variety of confederata.Female.?Length, 6-8 mm. ; type, 8 mm.Head and antennae black and white, the pattern as in ruflgaster,scape pale reddish ; thorax with same yellow pattern as confederata;legs and abdomen as in ruflgaster; wings immaculate.Male.?Smaller and more slender than female with sculpturelargely erased; propodeum without apophyses, but apical carina ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 35 very distinct; head white with only occiput and middle of vertexand frons and teeth of mandibles black; scape white, flagellum palereddish, fuscous above toward base; thorax pale testaceous with thewhite pattern less distinct than in female, some of the markingsusually absent; legs paler with most of front and middle legs andhind tarsus stramineous; tergites 2 and 3 blackish at base.Type-locality.?Pyziton, Clay County, Ala.Type.?Q^t. No. 40589, U.S.N.M.Five females and ten males, all but three collected by H. H. Smithat Pj'ziton, Coleta, and Langdale, Ala. ; one male from Cabin John,Md., August 6, 1917, R. M. Fouts; one male. Chevy Chase, Md., H. H.Smith ; one female, Rockaway Beach, Long Island, F. H. Chittenden.The New York specimen has the black of the head and thoraxmore extensive, the malar space and a line on each side of middle offace blackish red. DIAPETIMORPHA ACADIA, new speciesIn spite of its small size and red color this is of all the species mostclosely related to the genotype in general form and structure andalso in the strong color antigeny between the sexes.Female-?Length, 7-8 mm. ; type, 7.5 mm.Head very finely and weakly punctuate coriaceous, face denselyfinely punctate opaque; frons with a median carina; temples con-vexly sloping, not nearly perpendicular to body axis ; cheeks convex,occipital carina not sinuate nor prominent below; eyes very slightlyconvergent below, not at all sinuate within; malar space nearly aslong as basal width of mandible ; teeth of mandibles subequal ; an-tennae nearly as long as body, first three joints of flagellum long andslender, successively shorter, fourth a little more than half as longas third, others very gradually shorter. Thorax dorsally and ven-trally shining, finely and rather sparsely punctate, laterall}' con-fluently punctate; pronotum striate in impression; notauli shortlydistinct ; scutellum margined only at base, subpolished ; propodeumbicarinate, the apophyses not high, basal areas shining, sparselypunctate, middle and apical areas reticulate rugose, spiracles smalloval ; areolet fully as long as high ; cubitus obsolete beyond recurrent ; nervulus interstitial or nearly; nervellus reclivous, broken at aboutthe middle; legs slender, front tibia not inflated. Abdomen fusi-form, tergites 2 to 6 very broad and strongly folded, their spiraclesvery far from lateral margin ; first tergite polished, postpetiole ratherbroad but merging gradually into the petiole; tergites 2-6 opaquecoriaceous, apical tergites polished; sheath as long as abdomen ex-clusive of first tergite; ovipositor rather stout, compressed, sagittateat apex. 36 PROCEEDINGS OF THE NATIOISTAL MUSEUM vol.74Ferruginous; mouthparts, scutellum, upper division of metapleu-rum and region around apophyses more or less distinctly paler;antennae with an incomplete white annulus centering on seventhflagellar joint, red basad of annulus, black beyond; front wing withan infumate band below stigma; legs testaceous, front ones paler;apex of postpetiole indefinitely paler ; seventh tergite white above.Male.?Sculpture less dense throughout; apical carina entirelywithout apophj'^ses; abdomen narrow, spiracles close to margins oftergites; head black and white, orbits except interruption at vertex,face, clypeus, mouthparts and scape beneath white; antennae blackwith a whitish annulus centering on flagellar joint 11, joints grad-ually shorter from base, the fourth not abruptly shorter; thorax,especially laterally, and legs paler; wings hyaline; abdomen, exceptthe stramineous petiole, ferruginous.Type-locality.?Louisiana.Type.?C^t. No 40590, U.S.N.M.Nine females and eight males as follows : Four females and threemales, including the type and allotype, from Louisiana (C. F. Bakercollection); one female, Opelousas, La., G. R. Pilate; one female.Piano, Tex., October, 1907, E. S. Tucker; one male, Paris, Tex.; onemale, Lolita, Tex., J. D. Mitchell; one female, Victoria, Tex., April11, 1911, J. D. Mitchell ; one female, San Antonio, Tex., May 4, 1905,W D. Pierce (Hunter No. 112) ; one male, Alamaba (C. F. Bakercollection); one male, Lexington, Ky. ; one female, Raleigh, N. C,April 10, 1927, C. S. Brimley ; one male, Washington, D. C, July 14,1915, W. A. Donnell.DIAPETIMORPHA INTROITA (Cresson) (new combination)Figs. 3f, 6firMesostemis introUns Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 162, male.Type.?Gat. No. 1577, U.S.N.M.Mesostemis dejectus Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 163,female. Type.?No. 1174, Acad. Nat. Sci. Phila. (new synonymy).Cryptus armatus Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 411, female,(not Lucas). Type.- C-Ai. No. 2026, U.S.N.M. (new synonymy).Cryptus ashmeadii Dalla Torre, Cat. Hym., 1901-1902, p. 562 (new synonymy).Diapetimorpha armatus (Ashmead) Viereck, Proc. U. S. Nat. Mus., vol. 44,1913, p. 565.In spite of the marked color antigeny between the sexes I have nodoubt of the correctness of the above synonymy.Discussion based on the types of all names, a homotype (R. A.Cushman) of dejectus and three additional specimens of each sexFemale.?Length, 10-12 mm.Head behind eyes shining and sparsely punctate, otherwise mi-nutely densely punctate opaque; temples convexly sloping, cheeks AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 37 convex, occipital carina not sinuate nor prominent below ; eyesslightly converfjent below ; clypeus convex with a narrow reflexedmar; Nat. Can., vol.11, 1879, p. 113, fl.c:. 2h; Faune Ent. Can. Hym., 1883, p. 340, fls?. Sryh.?ViERECK, Smith, Ins. of N. J., 1910, p. 630.Mesoatenns erythrogaster Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 406,male. Tijite.?Cat. No. 2017, U.S.N.M. (new synonymy).Mesostenidca (Mesostenidea) thoracica (Cresson) Viereck, Hym. Conn. (1916),1917, p. 329.Within its range the most abundant Mesostenine.Discussion based on tyjDe and homotype (Cushman), the type oferythrogaster and many other specimens in the National Collection.Feiiude.?Length, 8-13 mm.Slender ; temples strongly, obliquely narrowed, nearly flat, polishedand sparsely punctate; vertex and frons medially rugulose; eyesparallel, practically straight within; face medially somewhat ele-vated and densely punctate, orbits coriaceous and sparsely punctate ; clypeus strongly convex, with a narrow reflexed margin, shining andsparsel}'^ punctate; malar space two-thirds basal width of mandible;mandible stout, teeth subequal ; basal joints of flagellum slender, suc-cessively slightly shorter, fourth three-fourths as long as third, otherssuccessively gradually shorter. Thorax nearly twice as long as deepand distinctly deeper than broad, densely punctate with some stria-tion in pronotal and mesopleural impressions, and scutellum polishedand impunctate ; notauli finely foveolate, meeting in a median impres-sion ; propodeum more or less rugose on posterior face, apical carinabroadly interrupted medially, high on angles. Abdomen less thana half longer than head and thorax, finely, coriaceous, postpetiolepolished with scattered punctures, suture between tergite and sterniteobsolete; second tergite much longer than broad at base ratherdensely punctate, third more finely and sparsely punctate; sheathnearly as long as abdomen ; ovipositor in profile stout, deeper at apexthan at base.Head black with orbits (usually interrupted behind top of eye),face medially (sometimes entirely), clypeus at base, mandibles partly,and an annulus centering on flagellar joint 8 whitish. Prothorax anddorsum of mesothorax and metathorax and sometimes the anteriorportion of mesopleuruin, sternum and propodeum black with whitishmarkings as follows : Collar and humeral margin of pronotum, tegu-lae, subalar tubercles, median spot on mesoscutum, scutellum laterallyand apically and its basal carinae, and postscutellum ; thorax andpropodeum otherwise ferruginous with upper part of prepectus andapical slope of propodeum sometimes paler; legs testaceous, frontcoxa and trochanter, spot on upper side of middle coxa, and hind 42 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 74tarsi stramineous; wings hyaline, veins brown, stigma paler. Ab-domen ferruginous, apical tergites sometimes blackish.Male.?Head thicker, temples less strongly sloping; antennaenearly as long as body, tapering toward apex; propodeum morecoarsely rugose, apical carina complete and strong throughout, notmore so at angles; abdomen very slender, second tergite three ormore times as long as broad at base.Entire face and clypeus, mandibles except teeth, scape below white ; antennal annulus centering on flagellar joint 13, lower part of pro-pleura, mesosternum, more or less of lower part of mesopleurum, asutural spot below hind wing, and apex of metapleurum more orless distinctly white ; front and middle coxae and trochanters largelyor entirely and hind tarsus entirely white, hind coxa more or lesswhite below, hind tibia fuscous to black at base and apex, as israrely also base of basitarsus.Distributed throughout southeastern Canada and the eastern halfof the United States.The type is from Delaware and that of erythrogaster from Wis-consin, The specimens in the national collection are as follows:Canada? (C. F. Baker collection), two females. Massachusetts ? (Baker collection), one male. Connecticut?East Kiver, ex Acro-hasis on hickory, C. R. Ely, one female, one male; Lyme, June 16,1918, W. Middleton, one female.. New York?one female; Ithaca,F. H. Chittenden, one female, one male; Oswego, June 1, 1896, onemale. Pennsylvania?West Fairview, July 31, 1909, and July 22,1911, W. S. Fisher, two females; Rockville, May 15, 1910, W. S.Fisher, one female; Camphill, August 13, 1910, W. S. Fisher, onefemale; Heckton Mills, June 22, 1910, W. S. Fisher, one female; ,Harrisburg, May 7, 1910, W. S. Fisher, one female; North Cumber-land, May 30, 1908, P. R. Myers, one female; Inglenook, June andSeptember, W. S. Fisher, three females; June 20, 1909, P. R. Myers,one female ; Highspire, W. S. Fisher, two females. Ohio?^Wooster,October 15, 1896, one female ; Bono, November 20, 1924, ex Pyraustafutilalis, C. R. Neiswander, one male. Maryland?College Park, Oc-tober 8, 1924, R. M. Fouts, three females; Beltsville, May 24, 1917,W. L. McAtee, one female; Glen Echo, R. M. Fouts, one female,three males ; Cabin John, R. M. Fouts, one female ; Plummer Island,one male; W. Middleton, one female. District of Columbia?threefemales, one male. Virginia, one female; Chain Bridge, October 2,1921, J. R. Malloch, one female; Pimmit Run, October 1, 1919, R.A. Cushman, one female ; Difficult Run, October 28, 1917, W. L. Mc-Atee, one female; Great Falls, R. P. Currie, S. A. Rohwer, H. L.Viereck, three females; Falls Church, September 9, 1912, C. T.Greene, one female; July 8, 1913, W. Middleton, one female; Hern- AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES?CUSHMAN 43don, August 21-28, 1912, ex Phlyctaenia extricalis, J. F. Strauss, fourfemales, four males. Alabama?Pyziton, one female, one male,Lanp^clale, one male, H. H. Smith. Louisiana?one female (Bakercollection) ; Lake Charles, November 13, J. C. Crawford. Missouri ? Kirkwood, ex Neplwpteryx pergratieUa^ November 11, 1882, MaryE. Murtfeldt, one female. Arkansas?Bentonville, ex Mineola, June21, Quaintance No. 20733, one male; July 18, one male, D. Isely.Texas?Dallas, May 23, 1906, F. C. Bishopp, one male. KansasOna??;a, Crevecouer, one male; Lawrence, August 20, 1896. HugoKahl. Colorado?one male, determined by Cresson.MESOSTENUS GRACILIS CressonMesostenus ffracUis Cresson, Proc. Ent. Soc. Phila., vol. 3, 1864, p. 315, male.Type.?No. 1180, Acad. Nat. Sci. Phila.Nematopodius orhitaUti Ashme^vo, Bull. Colo. Biol. Assn., vol. 1, 1890, p. 21,female. Type.?Cat. No. 24081, U.SN.M. (new synonymy).Mesostenus gracilis (Cresson) Vib3{eck, Smith: Insects of N. J., 1910, p. 630.Discussion based on type, that of orbitalis and 20 other males and30 other females in the National collection.The type of orhitalis is in very bad condition with abdomen andmany of the appendages missing, but I have no doubt of the cor-rectness of the synonymy.Female.?Length (>-12 mm.Not at all like NematopodivrS., to which genus Ashmead referred it,but a typical Mesosterms very closely allied to tJioracicus Cresson,from which it differs as follows:More slender, the thorax hardly half as deep as long; templesdistinctly convex; malar space nearly as long as basal width ofmandible; mesopleural impressions not at all striate; apical carinaof propodeum broadly interrupted medially, not high on angles,abdomen fully a half longer than head and thorax; second tergitefully twice as long as broad at base ; sheath not or barely two-thirdsas long as abdomen; ovipositor much more slender, especially atapex; orbits usually continuously white, rarely interrupted at topof eyes behind; mesoscutum frequently largely reddish, with onlythe notauli and sutures black ; front and middle coxae at most partlywhite, rarely partly black; hind tarsus usually entirely red, rarelywith joints 2-4 whitish.Male.?Differe from male of thoracicus as follows:Temples strongly convex; propodeum finel}^ rugose behind, apicalcarina usually entire, but sometimes interrupted medially, not espe-cially higher on angles; antennae usually without annulus, rarelywith a distinct annulus; hind tarsus with at most joints 2-4 white,frequently entirely black or blackish; hind coxa entirely red. 44 PROCEEDINGS OF THE NATIOlSTALi MUSEUM vol.74Generally distributed throughout the eastern half of the UnitedStates and extending in the South entirely across the continent andinto Mexico. The type is from Virginia and that of orhitalis fromColorado. The specimens in the National collection are as follows : Massachusetts?Milton, July 19, 1897, S. Henshaw, one male.Connecticut?one female. New York?Ithaca, F. H. Chittenden, onefemale, one male. Maryland?ex Bahrmna coccidivora^ two fe-males. District of Columbia?three females, one male. Virginia ? Falls Church, July 31, 1913, W. Middleton, one female ; Winchester,ex Euzophera semifuneralis^ Quaintance No. 15403, April 23, 1919,E. B. Blakeslee, one female. Ohio?Spring Valley, September13, 1896, one male. Illinois?Algonquin, two females, one male.Michigan?Agricultural College, two females. Wisconsin?Cran-moor, July 7, 1909, C. W. Hooker, one female. MississippiBiloxi, ex pupa LaetUia coccidivora, S. M. Tracy, one male.Louisiana?Baton Rouge, May 27, 1898, one female. Texas?Dallas,April 26, 1907, W. W. Yothers, one female ; April 6, 1909, F. C. Pratt,one female ; May 11, 1908, A. K. Pettit, one female ; Victoria, June 2,1906, C. E. Jones, one female ; Brownsville, May, 1921, J. C. Brid-well, one male; Devils River, ex Ozaniia\ clarefacto^ June 1925, A. P.Dodd, one male; Uvalde, ex Ozamia clarefacto, May, 1925, A. P.Dodd, two females; no locality, Belfrage, one female, one male.Kansas?Riley County, October, Marlatt, one female; Manhattan,one female. Arizona?one male. New Mexico?Roswell, April 15,Cockerell, one female; Las Cruces, May 5, one female; Mesilla,October 27-30, Cockerell, two miles. California?Saticoy, February3, 1927, S. E. Flanders, one female. United States?no locality, twofemales, eight males. Mexico?one female from C. F. Bakercollection. MESOSTENUS LEUCOPUS AshmeadFigs, le, 2g-hMesostenus leiicopus Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 406, male.Type.?Cat. No. 2018, U.S.N.M.Discussion based on type, two other males and five females, all inthe United States National Museum.The female of this species has not been described previously.Female.?Length, 10-12 mm.Temples very narrow but strongly convex, sparsely punctate,polished; vertex and frons above medially rugulose; anterior orbitsfinely coriaceous ; face medially shining and densely punctate ; clypeusmore sparsely punctate, strongly convex, eyes parallel; malar spacebarely two-thirds basal width of mandible; antennae nearly as longas body, slender, slightly thicker toward apex, basal three joints of ART. 16 NORTH AMERICAN ICHNEUMON-FLIES?CUSHMAN 45jflagellum successively gradually shorter, fourth to sixth each aboutthree-fourths as long as its predecessor, others very gradually shorter.Thorax shining, punctate, the punctures mostly well separated;pronotal and mesopleural impressions striate; mesoscutum moredensely punctuate, notauli very deep, complete, and strongly foveo-late; scutellum polished, practically impunctate; propodeum withapical carina complete and almost equally strong throughout, basalareas densely punctate, middle areas more coarsely punctate, apicalface transversely rugose ; legs very slender. Abdomen very narrowlyfusiform, subpolished, very faintly coriaceous, first tergite slenderthroughout, postpetiole barely twice as wide as petiole, nearly twiceas long beyond spiracles as broad, suture between sternite and tergiteobliterated ; second tergite nearly or quite thrice as long as broad atbase; sheath nearly as long as abdomen; ovipositor slender, slightlycompressed, decurved, apex in profile slightly sinuate.Head and thorax black with white markings as follows: Broadorbital ring, broadly interrupted at top of eye and narrowly so be-low; center of face and clypeus; mandibles largely; incomplete annu-lus centering on suture between flagellar joints 7 and 8; anteriorand humeral margins of pronotum; median spot on mesoscutum;scutellum; tegulae; subalar tubercle; elongate mark on lower edgeof mesopleurum; upper division of metapleurum and about upperhalf of lower division; and posterior face of propodeum except abroad median black stripe; wings clear hyaline, venation brown,btigma paler; legs testaceous, front coxa and trochanter largely whit-ish, hind tibia largely and tarsus yellowish; abdomen entirely paleferruginous.Male.?Like female except temples broader; face entirely whiteantenna without annulus ; propodeum with middle areas very coarsely,somewhat longitudinally rugose dorsally, transversely so laterally,apical face coarsely reticulate rugose; thoracic markings slightlysmaller; basal joint of hind trochanter and femur dorsally piceous,tibia largely black, more or less reddish below and near base, tarsusyellow with apical joint and base of first joint black; abdomen veryslender, compressed, black with base and apex of first tergite andbroad apices of all others ferruginous.The type is from Illinois, where it is said to have been reared byF. M. Webster as a parasite of a sawfly found on wheat. The otherspecimens are as follows: Lawrence, Kans., July 13, 1896, HugoKahl, one female ; Rosslyn, Va., H. H. Smith, one male ; Maryland ? Glen Echo, R. M. Fouts, one female ; Baltimore, one female ; Districtof Columbia, June 15, 1914, F. Knnb; and one of each sex withoutlabels. 46 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74MESOSTENUS PROMPTUS CressonMesostenus prompttts Cresson, Can. Ent., vol. 10, 1878, p. 209, male. Type.?No. 1186, Acad. Nat. Sci. Phila.Mesostenus americanus Cbesson, Can. Ent., vol. 10, 1878, p. 209, female. Type.?No. 1170, Acad. Nat. Sci. Phila.JSxetastes hrcvipennis PROvANCHEa:, Nat. Can., vol. 11, 1879, p. 213 ; Faune Ent.Can., Hym., 1883, p. 386, female, male. Type.?See discus.sion.Mesostenus promptus (Cresson) Provancheb, Faune Ent. Can., Hym., 1883,p. 785.Mesostenidea americana (Cresson) Vieeeck, Hym. Conn. (1916) 1917, p. 329.Mesostenus in-evipennis Peovancher, Faune Ent. Can., Hym., 1883, p. 794Mesostenus promptus (Cresson) Peovancher, Addit. Faune Can., Hym., 1889,p. 455, index.Discussion based on types of promptus and america/nus, notes onhrevipennis by S. A. Rohwer, and three females and two males inthe National Museum.There appears to be no reason for doubt that promptus and ameri-canus are the sexes of the same species, and S. A. Rohwer, who ex-amined the probable types of hrevipennis, indicated in his notes thatProvancher was correct in synonymizing his species with promptus.He writes that there are no specimens in the Provancher collectionunder the name h7'evipennis, but that the two under protnptus appearto be properly identified.Female.?Length, 8-12 mm.Temples oblique, weakly convex, polished, sparsely and weaklypunctate; frons and face medially densely punctate; eyes parallelwithin; malar space subequal to basal width of mandible; antennaedistinctly shorter than body, flagellar joints successively graduallyshorter from base. Thorax more than half as deep as long, dorsallypolished and sparsely punctate, laterally more densely punctate andsometimes largely rugulosely so, ventrally more finely and sparselypunctate ; notauli fine, complete ; propodeum rugose punctate, basallysparsely punctate, apical carina broadly interrupted medially ; wingsrather short, areolet rather shorter and broader than usual withrecurrent nearly interstitial, nervulus jDractically interstitial, ner-vellus with upper abscissa perpendicular to cubitella; abdomenslender, very finely coriaceous, first tergite polished, postpetiolelonger beyond spiracles than broad, second tergite fully twice aslong as broad at base ; sheath nearly as long as abdomen ; ovipositorslender, compressed, decurved, subsagittate at apex.Head and thorax black, abdomen ferruginous, immaculate exceptfor a small incomplete annulus centering on flagellar joint 8 andsometimes minute white spots on frontal orbits and scutellar carinae ; legs black, front and middle tibiae and tarsi and hind tarsus apically ABT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 47more or less reddish, hind femur varying from black to ferriginous,in the latter case the front and middle femora also largely ferru-ginous in front; wings uniformly infumate.Male.?Differs from female principally as follows : Anterior orbitswhite, narrowly on frons, broadly on face, clypeus, and mandibleswhite; antennae immaculate; collar, humeral margin of pronotum,tegulae, subalar tubercle, scutellum and its basal carinae, undersideof front and middle coxae and trochanters, and joints 2-4 of hindtarsus white; propodeum more coarsely sculptured, apical carinamore nearly complete, interrupted only by a narrow median foveolategi'oove; abdomen narrower, subcompressed toward apex; wingslonger, hyaline.The type of yromytus is from Illinois, that of atnericanus fromMaine, and that of hrevipennis from Canada. The United StatesNational Museum specimens are as follows: Ames, Iowa, August 13,1925, one female; Pringle, S. D., July 15, 1924, one female; Col-orado, C. F. Baker collection, one female; and two males withoutlabels. The Colorado specimen is a homotype (Cushman) of avieri-canus and one of the males has been compared by Cushman with thetype of prcytnptus. MESOSTENUS MELANURUS. new speciesVery distinct because of its broad temples, short, thick thorax,immaculate antennae, and polished abdomen.Fenwle.?Length, 7 mm.Temples nearly as broad as eyes, very strongly convex, distinctlypunctate; frons and face punctate, more densely so medially; eyesparallel ; malar space very nearly as long as basal width of mandibje ; antennae apparently nearly as long as body (extreme apices gone),first joint of flagellum about a third longer than second, othersgradually, successively shorter. Thorax but Jittle more than a halflonger than deep, dorsally and ventrally polished and rather sparselypunctate, laterally opaque and finely, very densely, almost retic-ulate, punctate ; propodeum very short, apical carina obsoletely inter-rupted medially, ascending much more closely than usual to basalcarina, hardly more prominent at angles, basal areas polished andsparsely punctate, middle areas obliquely rugulose, apical areareticulate rugulose ; areolet elongate, recurrent antefureal ; nervulusantefureal; abdomen polished, almost impunctate, postpetiole muchshorter beyond spiracles than broad, second tergite hardly a halflonger than broad at base; sheath nearly as long as abdomen; ovi-positor slender, slightly compressed, decurved, elongately subsagit-tate at apex. 48 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74Black, postpetiole, second tergite and base of third dark fer-ruginous; antenna without annulus, legs black, more or less dis-tinctly reddish beyond femora; wings infumate, front wing darker.Type-locality.?Calgary, Alberta.Type.?C^t. No. 40591, U.S.N.M.One female captured May 12, 1923 by George Salt.Genus DEROCENTRUS CushmanDerocentrus Cushman, Proc. Eut. Soc. Wash., vol. 21, 1919, p. 113. Genotype.?(Coleocentrus texamis Ashmead) =Mesostenns madlentus Cresson.Very close allied to MesosteTms, but immediately separable by thevery long apical joint of hind trochanter and in female by the verylong ovipositor.The antennae in female and the legs are excessively slender ; the firsttergite is straight; the second tergite is very nearly as long as thefirst and fully four times as long as broad at base, just behind whichit is slightly constricted ; the front tarsus is twice, and its basal jointnearly, as long as tibia; the apical joint of the hind trochanter isabout twice as long as the basal joint and nearly half as long as thefemur ; the areolet is more elongate, the ovipositor is nearly or quitetwice as long as the body. Otherwise agrees well with the foregoingdescription of Mesostenus.Only one species, having several synonyms, is thus far known.DEROCENTRUS MACILENTUS (Cresson) (new combination)Figs. SflT, 4o, QlMesostenus longicaudis Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 164,female. (Not BruUe). Type.?Qat. No. 1578, U.S.N.M.Uesostenus macileiitus Cresson, Can. Ent., vol. 10, 1878, p. 210, male. Type.?No. 1183, Acad. Nat. Sci. Phila.Mesostenus graciUpes, Cresson, Proc. Acad. Nat. Sci. Phila., 1878, p. 365, fe-male. Type.?No. 1179, Acad. Nat. Sci. Phila.Coleocentrus texamis Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 444, fe-male. Type?Probably Cat. No. 1578, U.S.N.M. Paratype.?Cat. No.2105, U.S.N.M.Mesostenus macrurus Dalla Torre, Cat. Hym., 1901-1902, p. 544.Nematopodius longicatidus (Cresson) Ashmead, Proc. Wash. Acad. Sci., vol.4, 1902, p. 206, female not male,Nematopodius exclamans Viereck, Trans. Kans. Acad. Sci., vol. 19, 1904, p.318, female. Type.?Kansas University.Nematopodius graciUpes (Cresson) Viereck, Trans. Kans. Ac^d. Sci., vol. 19,1904, p. 318.Nematopodius longicaudus (Cresson) Viereck, Trans. Kans. Acad. Sci., voL19, 1904, p. 318.Nematopodius macilcntus (Cresson) Viereck, Trans. Kans Acad. Sci., vol. 19,1904, p. 319. ABT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 49Derocentrus texanus (Ashmead) Cushman, Proc. Ent. Soc. Wash., vol. 21,1919, p. 114.Derocentrus graeilipes (Cresson) Gttshman, Proc. Ent. Soc. Wash., vol. 21,1919, p. 114.In spite of the p;reat difference in color between the sexes thereseems to be no doubt that they belong to the same species.Discussion based on types of longicaudius, maeilentus, texanus (ap-parently the same specimen as type of longicaudus) and the para-typo of fexamis, a homotype (Gahan) of exdamans^ a homotype(Cushman) of niacilentiLS, a specimen compared by Cushman withthe type of gracUrpes, and 20 other females and 23 other males.Female.?Length, 8-12 mm.Temples convexly receding; malar space nearly as long as basalwidth of mandible; flagellum very slender and of uniform thiclmess,first joint fully eight time as long as thick. Thorax twice as long asdeep, sparsely punctate dorsally and ventrally, more densely solaterally; pronotum polished, practically unsculptured except afoveolate groove along posterior margin; notauli foveolate; ^vo-podeum opaque rugulose; nervellus broken not far below middle,reclivous, upper abscissa perpendicular to cubitella. Abdomen sub-polished, very faintlj^ coriaceous; first tergite polished.Body and legs nearly uniformly ferruginous, ventrally and aboutthe scutellum and postscutellum more or less stained with black;antennae ferruginous at base, black beyond Avith a small, incompleteannulus centering on flagullar joint 8; wings uniformly pale in-fumate.Male.?Temples nearly as broad as eyes and more strongly con-vex than in female; malar space barely two-thirds basal width ofmundible ; flagellum rather stout at base, tapering toward apex, firstjoint hardly four times as long as thick. Thorax more coarselysculptured; lateral impression of pronotum strongly striated; ab-domen linear.Head and thorax black with whitish markings as follows: Orbits,except interruption at top of eye and usually in malar space; some-times middle of face and clypeus; mandibles; anterior and humeralmargins of pronotum; spot in middle of mesoscutum; scutellum;subalar tubercle; usually an elongate mark or two spots on lowerpart of mesopleurum ; upper division of metapleurum and about thedorsal half of lower division, and sides of apical face of propodeumbroadly ; antennae black, scape rarely reddish ; legs testaceous, coxaeusually more or less white, sometimes more or less black at base ; basaljoint of hind trochanter sometimes piceous; apex of tibia and first,fourth, and fifth tarsal joints sometimes more or less blackish, joints2 and 3 largely white; wings paler than in female; abdomen fer- 50 PROCEEDINGS OF THE NATIONAL MUSEUM tol. 74 ruginous, frequently more or less stained with black ventrally andapically.Except for the lack of black bands on the abdomen the male is verysimilar in color to Mesostenus leucopus Ashmead.The type of rriacUentus is from Louisiana, that of longic(mdusfrom Texas, that of gracilipes from California, that of texanus fromTexas (paratype from South Carolina), and that of exclamans fromKansas. The additional specimens in the National collection areas follows: New Jersey?Bridgeton, July 16, 1924, L. A. Steams,one female. Maryland?Dorchester County, October 2, two females;Marshall Hall, August 29, one male. District of Columbia?onefemale. Virginia?Falls Church, September 2, 1918, E,. A. Cush-man, six males; Leesburg, September 26, 1918, G. W. Underhill,one female. Ohio?no locality, C. H. Kennedy, one female; Co-lumbus, July 21, 1920, A. E. Miller. Kansas?Kiley County, May22, F. Marlatt, one female. Colorado?no locality, C. F. Bakercollection, one female, six males; Rocky Ford, April 16-24, 1921,reared but host not given, C. E. Mickel, one female, two males.Texas?Paris, October 7, 1904, A. A. Girault, one female; Chilli-cothe, August 17, 1909, T. D. Urbahns, two females; Cotulla, May 12,1906, J. C. Crawford, one female, April 17, 1906, F. C. Pratt, onemale ; Victoria, April 6 and July 11-28, J. D. Mitchell, four females,two males; Corpus Christi, one male; Brownsville, July 6, onefemale. New Mexico?^Las Cruces, T. D. A. Cockerell, three males.Genus POLYCYRTUS SpinolaPolycyi-tus Spinola, Ann. Soc. Ent. France, vol. 9, 1840, p. 154. Genotype.?Polycyrtus histrio Spinola.PolycyrtimorpJia Viereck, Proc. U. S. Nat. Mus., vol. 46, 1913, p. 383. GetU)-type.?PolycyrtimorpJia amocnus "Viereck.The single character on which Viereck founded his Polycyrtimor-pka (the occipital carina joining the hypostomal carina) is ap-parently not of generic value. At the point where the occipitalcarina bends toward the hypostomal carina it varies greatly in height,increase in height being accompanied by reduction in strengthtoward the hypostomial carina sometimes to the point of virtualdisappearance.Head broadly transverse, temples sharply receding ; occipital carinafrequently very high, frequently very prominently angled below andnot reaching hypostomal carina, latter high and flangelike ; eyes moreor less convergent below; frons with a stout median horn; clypeusvery strongly elevated, apically inflexed and with a narrow reflexedmargin; malar sjjace long; upper tooth of mandible more or lessdistinctly longer than lower tooth; antennae long, slender, in female ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 51 slightly thickened in middle, tapering and flattened below towardapex, in male of nearly uniform thickness except apical taper.Thorax long, distinctly compressed, polished, at most sparsely sculp-tured ; humeral margins of pronotum swollen and angled by epomia ; notauli complete, the mesoscutal lobes very high ; scutellum narrowimmargined, its basal ridges very high and thick; propodeum withonly one complete transverse carina, the basal, apical carina alwayswanting medially and usually represented only by very long apo-physes; spiracle large, oval; stigma very narrow, radius before mid-dle ; areolet elongate, wider at apex than at base, recurrent at or nearapex; postnervulus broken at or near middle; nervellus reclivous,its upper abscissa perpendicular to cubitella ; legs slender. Abdomenslender, usually with long sparse hairs toward apex; first sternitefused with tergite and extending beyond spiracles, postpetiole onlya little wider than petiole; sheath not or barely as long as abdomen;ovipositor compressed, sagittate at apex.This is a typically tropical genus containing only one NorthAmerican species. POLYCYRTUS NEGLECTUS CushmanFigs. If, 3/f, GfcPolycyrtus tiegJectus Cushman, Proc. U. S. Nat. IMus., vol. 67, art. 23, 1926,p. 5, females, males. Type.?Cnt. No. 27683, U.S.N.M.The original description of this species is so recent and so detailed(hat a full description here is unnecessary.A few points suggested by the above generic description may beadded. The occipital carina is not especially prominent nor is ittoothed or interruoted below; eyes very slightly convergent; uppertooth of mandible very slightly longer than lower; antennae aboutthree-fourths as long as body.In addition to the 11 females and 16 males of the type series theNational collection contains the following specimens: Maryland ? Glen Echo, R. M. Fonts, one female, three males; Cabin John, June23, 1917, R. M. Fonts, two females. Pennsylvania?Inglcnook, June20, 1909, P. R. Myers, one female; Marsh Run, York County, July18, 1909, P. R. Myers, one male. Connecticut?Lyme, August 28,1909, A. B. Champlain, two males.The C-onnecticut specimens extend the known range of the speciesabout 200 miles farther to the north.Genus POLYCYRTIDEA ViereckPolyayrtidea Viereck, Proc. U. S. Nat. Mus., vol. 46, 1913, p. 382. Oenofi/pe.?Polycyrtidca gracilis Viereck.If I interpret the very brief original description correctly Mesos-tenits jnmllus Cresson and Agrypon favopictus Ashmead. both from 52 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74the West Indies, belong here. The latter species, except in size,agrees rather closely with the description of the genotype, which ispractically entirely of coloration.Temples convexly receding; frons very deeply concave, horn py-ramidal with a carina on each side and one below running from baseto apex, the base broad; eyes slightly convergent; malar space sub-equal to basal width of mandible ; clypeus elevated ; occipital carinaneither angulate nor interrupted below; upper tooth of mandiblelonger than lower; antennae in female about three-fourths as longas body, slender, slightly thickened beyond middle, not flattenedbelow, tapering at apex, in male slender throughout. Thorax robust,much more than half as deep as long, compressed; humeral marginsof pronotum subangularly tuberculate in front ; notauli deep at leastanteriorly ; scutellum broader than long, strongly convex ; propodeumwith basal carina close to base and with more or less distinct tracesof apophyses, sloping precipitously behind basal carina, spiracles ^small oval; stigma very narrow; areolet very small, open behind;discoidal cell pointed at base; nervulus antefureal; nervellus inclivous,broken near bottom or not broken ; legs very slender, the hind femurslender subclavate, longer calcarium fully half as long as basitarsus.Abdomen slender; first sternite extending far beyond spiracles, com-pletely fused with tergite, postpetiole only slightly wider than petiole;second tergite fully as long as first, these two together comprisingmuch more than half total length of abdomen; sheath not or barelyas long as first tergite; ovipositor slender, compressed, elongatesagittate at apex.The genius is apparently wholly tropical in its range, the singlespecies occurring within the borders of the United States, beingknown only from the extreme southern point of Texas.(MESOSTENUS) POLYCYRXroEA PUSILLUS (Cresson) (new combination)(AGRYPON) POLYCYRTIDEA FLAVOPICTUS (Ashmead) (new combination)These two West Indian species are not known to occur on thecontinent and are included here only to record the generic transfers.POLYCYRTIDEA LIMITIS, new speciesFigs. Iff. Qi)iFemale.?Length, 9 mm.Temples and vertex behind ocelli polished, frons medially rugu-lose; face, malar space, and clypeus basally opaque coriaceous, theface densely and clypeus sparsely punctuate; malar space fully aslong as basal width of mandible. Thorax coareely sculptured, pro- ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 53notum laterally rugose, mesoscutum and scutellum sparsely punc-tate, mesopleurum above longitudinally striate, below sparsely punc-tate, sternum and metapleurum densely punctate, speculum andlower angle of upper division of metapleurum polished and unsculp-tured; notauli complete; propodeum polished before basal carinaopaque reticulate regulose behind, apophyses represented by lowrounded tubercles. Abdomen opaque, very finely coriaceous, firsttergite polished, sheath distinctly shorter than first segment.Head *and thorax piceous black and yellow, the yellow more ex-tensive than the black, embracing the following: Head except middleof frons and vertex and occiput; under side of scape; an incompleteannulus on flagellar joints G-11 (antennae otherwise black) ; all ofpronotum except a narrow transverse band across middle; innerposterior edges of lateral lobes of mesoscutum and the outer anterioredges of middle lobe ; scutellum, its basal carinae, and postscutellum ; tegulae and subalar tubercles; most of mesopleurum, sides ofsternum, and both divisions of metapleurum; propodeum beyondbasal carina except lateral anterior corners and a small median apicalspot; prepectus and mesosternum reddish; legs testaceous; front andmiddle tibiae and tarsi stramineous; hind tarsus blackish at baseand apex, first joint largely, second entirely, and third apicallywhite; wings hyaline, venation blackish; abdomen ferruginous, baseof petiole and second and third tergites except broad apical andlateral margins blackish.Type-locality.?Brownsville, Tex.Type.?C2it. No. 40592, U.S.N.M.One specimen taken September 29, 1906, J. C. Crawford.ACERASTES, new genus"Very closely related to Polycyrtidea Viereck and should, perhaps,be considered merely a subgenus of that genus. But the genotypeand two apparently undescribed Neotropical species differ from thethree species of Poh/cyrtidea in lacking the frontal horn and in hav-ing the areolet rather large, well defined, and pentagonal, thoughopen behind, with the recurrent before the middle and the cubitusbeyond the recurrent weak and bent sharply forward at recurrent andthen sharply backward at the position of the second intercubitus.Genotype.?Mesostenus pertinax Cresson.Three specimens of one of the undescribed species referred to werereared from a spider egg-sac.Represented in the United States only by the genotype. ? From a-)?pQaTi7s=without a horn, referring to the lack of a frontal horn. 54 PROCEEDINGS OP THE NATIONAL MUSEUM vol.74ACERASTES PERTINAX (Cresson) (new combination)Figs. Si, 5, 6nMesostenus pertitwx Ckesson, Trans. Amer. Ent. Soc., vol. 4, 1872, p. 163,female. Type.?Csit. No. 1429, U.S.N.M.Discussion based on type and three other females, all in the Na-tional collection.Female.?Length, 5.5 mm.Head polished beliind ; frons with a weak median carina and veryfaintly coriaceous; face, clypeus and malar space opaque coriaceous,the face medially and clypeus basally minutely punctate; eyesslightly convergent below ; malar space hardly as long as basal widthof mandible; antennae very nearly as long as body, slender, barelythicker beyond middle. Thorax nearly twice as long as deep, prono-tum polished, foveolate along posterior margin; mesoscutum pol-ished, middle lobe sparsely punctate anteriorly and with a mediangroove posteriorly, notauli deep and complete; scutellum polished;mesopleurum striate in impression, punctate below, speculum pol-ished, mesosternum finely punctate; metapleurimi more coarselypunctate, upper division polished in lower angle; propodeum pol-ished before basal carina, finely reticulate rugose behind, apex trans-versely so, apophyses represented b}' small tubercles; nervellus re-clivous, upper abscissa perpendicular to cubitella; legs slender, butnot so slender as in Polycyrtidea limitis, the hind femur not sub-clavate. Abdomen somewhat broader than in Polycyrtidea,, veryminutely coriaceous, except first tergite, which is polished, postpeti-ole at apex twice as broad as petiole; sheath little more than half aslong as first tergite; ovipositor compressed, sagittate at apex.Head and thorax black and yellow, more yellow than black, withbase of propodeum reddish piceous to ferruginous; yellow as fol-lows: Head, except occiput and middle of face and frons, underside of scape and first two or three flagellar joints, and a completeannulus on flagellar joints 6-9; anterior and humeral margins ofpronotum, two elongate marks on disk of mesoscutum, scutellumand its basal carinae, postscutellum ; subalar tubercle, speculum, andlower half of mesopleurum; sternum (sometimes reddish); bothupper and lower divisions of metapleurum; and propodeum behindbasal carina except in anterior angles and apical middle; wings hy-aline, venation brown; legs testaceous, front coxae and trochantersand sometimes the other coxae more or less stramineous ; hind tarsusreddish or fuscous, usually with second and third joints more or lesswhite; abdomen ferruginous, petiole somewhat paler.The type and one of the other specimens are from the BelfrageTexas collection ; a third is from Piano, Tex., October, E. S. Tucker ; and a fourth from Minatitlan, Mexico, February 1, 1892, HerbertOsborn. I AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 55The type has the propodeum basally red and the hind tarsusentirely red. Genus POLISTIPHAGA CushmanPoUstiphaga Cushman, Jouni. Wash. Acad. Sci., vol. 15, 1925, p. 391. Qcno-type.? i^Mesostcnufi arvalis Crcs-sou) =lfcsos/cHMs fiilvus CressonIt might be argued that this genus should be relegated to theHemitelini because of the areolation of the propodeum and the openareolet, but the general appearance and structure indicate its affinitywith the Cryptini. All of the basal and apical areas are defined,while the carinae separating the areas between the transverse carinaemay or may not be present, in the latter case perhaps adventitiouslydue to the exaggeration of certain of the rugae lying in that region.The generic description is too recent and too detailed to requirerepetition here, but certain features not there mentioned may be added.Eyes slightly convergent below; frons with a median carina, butwithout a horn; notauli complete; areolet elongate, open, recurrentat or near position of second intercubitus ; discoidal cell broad atbase ; nervulus antefureal ; nervellus inclivous, broken below middle ; first abdominal segment decurved, sternite not or barely reachingspiracles, postpetiole abruptly widened and much wider than petioleabdomen rather broadly fusiform, coriaceous, impunctuate; sheathshorter than first segment; ovipositor compressed, sagittate at apex.The following two species occur in the restricted region. Both areparasitic in the nests of wasps of the genus Polistes:1. Thorax and abdomen hxrgely red fulva (Cresson).Thorax and abdomen black and yellow zonata, new species.POLISTIPHAGA FULVA (Cresson) Fig. 6oMesoatenusf fulvus Cbksson, Proc. Ent. Soc. Phila., vol. 3, 1864, p. 316, male.Type.?No. 1178, Acad. Nat. Sci. Phila.Meiostenus arvalis Cresson, Trans. Amer. Ent. Soc, vol. 14, 1872, p. 163, female.Type.?No. 1171, Acad. Nat. Sci. Phila.Mesostetiidea {ChristoUa) arvalis (Cresson) Viereck, Hym. Conn. (1916)1917, p. 329 and 330.Polistiphaga arvalis (Cresson) Cushman, Journ. Wash. Acad. Sci., vol. 15, 1925,p. 391.Discussion based on types of both names, two paratypes ofarvalis, a homotype (Cushman) of fulva, and 38 other females and18 other males, all but the types in the National collection.Fenude.?Length, 5-9 mm.Head, thorax, and abdomen opaque, finely coriaceous, the headand thorax with additional coarser sculpture, the abdomen withoutadditional sculpture; frons medially rugulose; face finely punctate; 56 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74pronotal impressions striate; mesoscutum densely, finely punctate;mesopleurum, sternum and metalpleurum finely punctate, the pleuramore or less striately so; basal areas of propodeum without coarsesculpture, middle areas longitudinally, apical areas transversely ru-gose; areolet rather large, the lumen several times broader than thethiclaiess of the surrounding veins.Ferruginous ; occiput and middle of vertex and frons more or lessstained with black; head otherwise yellow; antennae black, scapepale below, a short white annulus centering on suture betweenflagellar joints 7 and 8; mesoscutum darker than rest of thorax; aband across middle of pronotum, notauli, and sutures on dorsum ofthorax blackish ; anterior and humeral margins of pronotum, scutellarcarinae, tegulae, subalar tubercles, sternauli, sutures on sides ofthorax, and apophyses yellowish; wings hyaline, venation brown,stigma pale; legs concolorous, hind tarsus with joints 2-4 yellow, 5black; abdomen immaculate.Male.?Differs practically only sexually from female. A little morecontrastingly colored, and with antennal annulus occupying flagellarjoints 9-11.The type is from Illinois, the type series of arvalis from Texas.The other specimens in the National collection are as follows: On-tario?Toronto, three females, two males. New York?Long Island,one female. Illinois?Chicago, one female. Wisconsin?MilwaukeeCounty, two males. Maryland?Glen Echo, R. M. Fonts, one male.Virginia?Near Stubblefield Falls, October 23, 1921, J. R. Malloch,one female ; October 30, 1921, W. L. McAtee, one female. Charlottes-ville, July 10, 1922, A. M. Vance, one female. Arkansas?one femalefrom collection of C. F, Baker. Texas?Belfrage collection, twelvefemales, four males ; Dallas, September 26, 1905, A. J. Leister, sevenfemales, four males, including the homotype; Rosser, ex nest ofPolistes (Hunter No. 1123), September 25, 1905, C. R. Jones, fivefemales, three males. Kansas?parasite of Polistes^ 1872, C. V. Riley,three females, two males; Riley County, Marlatt, September, twofemales; Manhattan, August 23, 1920, R. C. Smith, one female (saidto have been reared as a parasite of a noctuid larva on alfalfa). Cali-fornia?Huntington Beach, September 25, 1904, E. S. G. Titus, onemale; Humboldt Count}^, June 12, H. S. Barber, one female.POLISTIPHAGA ZONATA, new speciesFig. 3?iVery distinct from fulva in its black and yellow color as well asin certain features of structure.Fenuile.?Length 7 mm.Head finely coriaceous opaque, frons medially rugose, face veryfinely punctate, malar space ver}'^ nearly as long as basal width of ABT. 16 NORTH AMERICAN ICHNEUMON-FLEES CUSHMAN 57mandible; occipital and hypostomal carinae meeting very close toventral articulation of mandible. Thorax finely opaque coriaceous,depressions of pronotum and upper part of mesopleurum, striate;middle and posterior areas of propodeum weakly rugose, the petiolarareas subpolished; thorax otherwise at most sparsely punctate; areo-let very small, the lumen hardly as broad as thickness of the sur-rounding veins. Abdomen finely coriaceous, opaque.Black with profuse yellow markings as follows: Orbits, nearlymeeting behind ocelli, face, mouth parts, under side of scape, and an-nulus occupying flagellar joints 6-11; anterior and humeral marginsof pronotum, propleura, lateral margins of prescutum and inner mar-gins of lateral lobes of mesoscutum, scutellum, postscutellum, tegulae,mesopleurum except impressions, prepectus, sternum, both upper andlower divisions of metapleurum largely, propodeum behind basalcarina except middle of petiolar area and narrow marks along lateralmargins; and broad apical and lateral margins of tergites; wingshyline, veins brown, stigma pale; legs pale testaceous, coxae andtrochanters paler above, hind coxa with a blackish streak above;hind tarsus with joints 2-4 white, 5 black.Type-locality.?Victoria, Tex.Host.?Polistes Tiiacidata.Type.?C^t No. 40593, U.S.N.M.Five females in poor condition reared November 10, 1914, by J. D.Mitchell. SPECIES WRONGLY REFERRED TO MESOSTENINIThe name in parentheses is that of the author of the species andthe name following the parentheses is that of the authority for thetransfer. The words " Rohwer notes " indicate that the transfer ismade on the basis of the examination of the type by S. A. Rohwer,or confirmed by his examination.{Mesostenus) Phygadeuoii alhicoxus (Provancher) Provancher.This transfer was made in " Faune Ent. Can. Hym., 1883, p. 318.."{Mesostenus) Mesoleptus alhifacles (Provancher) Davis, Rohwernotes.{Mesostenus) Gratickneumon annulatus (Provancher) Roman.{Mesostenus apicalis Provancher) =Aniblyteles -finitwius (Cres-son). New combination.{Mesostenus longicoi^nis Vvo\q.ivc\.\qv)= Mesoleptus nioyeni (Pro-vancher, teste Provancher, Davis and Rohwer notes.{Mesostenus) Phygadeuon -fiavipes (Provancher) Davis, Rohwernotes.{Mesostenus) Tryphonini latigaster (Provancher), Rohwer notes.{Mesostenus) Pezoporus nigricomis (Provancher), new combina-tion, Rohwer notes. 58 PROCEEDINGS OP THE NATIONAL. MUSEUM vol.74{Mesostenus nitidus Provancher)=/'es