Proceedings ofthe United StatesNational MuseumSMITHSONIAN INSTITUTION ? WASHINGTON, D.C. Volume 120 1966 Number 3562 NOTES ON FLIES CAPTURED IN TREETOPS IN MALAYA(DIPTERA: EMPIDIDAE, NERIIDAE, PLATYSTOMATIDAE,SEPSIDAE, MUSCIDAE) By George C. Steyskal ^ An unusually interesting lot of Diptera captured on treetop plat-forms in the Selangor Gombak Forest Reserve, Malaya, by Dr. H.Elliott McClure, of the U.S. Armed Forces Institute of Pathology,was presented to this author for determination. The following notesare the result. All specimens are deposited in the collections of theUnited States National Museum (USNM) . The following abbreviations, referring to leg parts, chaetotaxy,and wing veins, have been used throughout: a= anterior, acr=acrostichal, ac?= anterodorsal, az;= anteroventral, ex? coxa or coxae(cxi= forecoxa, etc.), (i=dorsal, c^c=dorsocentral,/=femur or femora(/i=forefemur, etc.), /o=fronto-orbital, A=humeral, TOs^Z=meso-pleural, 7i^p^=notopleural, ^=posterior, ;pa=postalar, pd?postero-dorsal, ^^Z=propleural, ^ra=prealar, ^rs=presutural, 2^rsc=pres-cutellar, pw=posteroventral, sa= supra-alar, sc=scutellar, sl=sublateral, sipZ=sternopleural, ^= tibia or tibiae (ii= foretibia, etc.),to= anterior crossvein, <^=posterior crossvein, y= ventral, vti^innervertical. 1 Entomology Research Division, Agriculture Research Service, U.S. Depart-nnent of Agriculture, Washington, D.C. 1 PROCEEDINGS OF THE NATIONAL MUSEUMFamily EmpididaeHybos melanaugeSf new speciesFigures la-eMale.?Length of body 3 mm; wing 3.25 mm.Color black, only basitarsi brownish. Sides of thorax, posteriorpart of mesonotum, and coxae, with thin white pruinosity; middle ofmesonotum shining with very little microsetation ; bristles black;hairs of coxae, dorsal side of /i and/3, and abdomen white. Figure 1. ? Hybos melanauges, new species: a, antenna; h, right middle tibia and tarsus,anterior view; c, wing; d, postabdomen, right side; e, postabdomen, left side. HybosmeracTUs, new species: /, wing; g, tip of abdomen; h, right middle tibia and tarsus, an-terior view (x= position of bristle on posterior side); i, antenna.Head with eyes contiguous above, ommatidia of upper half approx-mately twice as large as lower ones; antenna as in figure la, arista NO. 3562 MALAYAN FLIES?STEYSKAL 3bare; proboscis slightly shorter than height of head; palpi a littleshorter than proboscis, very slender, with only one rather smallapical bristle.Thoracic chaetotaxy: 2 ntyl, 1 jpa, 1 dc (also a few small anteriordorsocentral hairs), 1 acr, 1 sc; pa, dc, acr in transverse line somedistance anterad of scutellum.Wing (fig. Ic) hyaline, with poorly developed brown stigma;halter pale yellowish.Legs slender; /a somewhat clavate, at apical third 0.15 as wide aslong. Bristles of legs as follows : U with one short median d and onelong preapical ad; ti as in figure 16; /a with complete row of 18-17staggered av, mostly approximately as long as femoral diameter, inapical half with 3-4 pv; U with one long median ad, followed a shortdistance apicad by a smaller d, one ad at apical 1/7, and one each adand pd preapicals; tx with basiventral basitarsal bristle and eachtarsal segment of all tarsi with more or less distinct preapical adand pd; basitarsuso with a secondary basiventral and 2 median jpv;basitarsuss slightly enlarged.Abdomen with sparse whitish hairs of moderate length; postabdo-men (fig. Id-e) scarcely greater in diameter than preabdomen, dorsalvalves each with 2 apical processes and rows of black bristly hairs.HoLOTYPE.?Male, Malaya, Selangor Gombak Forest Reserve, treeplatform, February 24, 1962 (H.E. McClure), USNM 67631.This species runs in Frey's key (1953, pp. 57-71) to H. nigronitidusBrunetti, described from northern India and recorded by Frey fromnortheast Burma; it differs therefrom by its lack of "stiff hairs" onthe humerus, narrowly brown knees (except possibly on middle legs),pale hairs on the under side of the tarsi, and "wollig weisslicheBehaarung" [wooly whitish hairs].Hybos meracrus, new speciesFigures If-iFemale.?Length of body 3 mm; wing 3.25 mm.Head, thorax, and abdomen shining black; legs, including coxae,yellowish, all knees narrowly piceous; fi dark drown dorsally; /ablackish above in apical 0.15; apical tarsal segments brown.Head with eyes contiguous above, ommatidia of upper half twiceas large as lower ones; antenna (fig. li) black, arista short plumose;proboscis brown, slightly shorter than height of head; palpi nearly aslong as proboscis, slender, black, bearing a few small bristles at andnear apex.Thorax with pale gray pruinosity on sides and in humeral grooves;mesonotum with scanty grayish pruinosity laterally; mesonotumposteriorly and scutellum and metanotum with somewhat denser 4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 120yellowish microsetation ; middle of mesonotum with very scant andminute microsetation; strong blackish bristles as follows: 1 rdpl, 1 sa,1 dc, 1 acr (prescutellar) ; all other thoracic setae hairlike, yellowish.Wings (fig. 1/) pale brownish with deep brown stigma; venation asshown; halter pale yellowish.Legs slender, /s somewhat clavate, at apical fourth 0.12 as wide aslong; coxae and most of legs with pale yellowish hairs;/ and t withbristles as follows: ti with one long median d and one long preapicalad, also with nearly erect fine ventral hairs nearly as long as tibialdiameter; ti (fig. lA) including one p of moderate length at positionindicated by a:;/3 with complete row of 9 av, longest (median) some-what longer than greatest diameter of femur; also 2 ad, one slightlyapicad of middle and one at apical )i ; tz with one d shortly apicad ofmiddle and one each a and pd preapicals; tarsi with moderately longhairs, one basiventral bristle on basitarsusi and basitarsusj, eachsegment of all tarsi with more or less distinct preapical ad and pd',basitarsusa slightly enlarged.Abdomen with sclerites black, lightly grayish pruinose and withsparse whitish hairs of moderate length; terminal segments (fig. Ig)with bristles black.HoLOTYPE.?Female, Malaya, Selangor Gombak Forest Reserve,tree platform, February 24, 1962 (H. E. McClure), USNM 67632.This species runs in Frey's key (1953) to H. apicalis Frey, but differsby having f^ with less black apically and the upper ommatidia en-larged, or to H. annulipes Frey, from which it differs also in its dif-ferently colored /g and the differently bristled ti. Both of thosespecies are from Burma. If one considers the 2nd wing vein suffi-ciently bowed apically to place this species in Frey's subgenus Pseu-dosyneches, it would run to H. palawanus Frey, differing therefromby its hairy arista and by the presence of only 2 bristles on /a.Family NeriidaeThe following key is offered in the hope that it wUl be found animprovement over the one by Aczel (1954, p. 511).Key to Asiatic Genera of Subfamily Neriinae1 (4). Antennal socket largely unpolished, matt or at most with slightlygreasy appearance; only 1 ntpl.2 (3). Third antennal segment short oval with acute tip blending directly intoapical, densely white-felted arista; tips of ti and all /of cf distinctlyclavate; large species Rhoptrum Enderlein3 (2). Third antennal segment oval to long oval, with rounded tip; tip of ti andall / of cf ordinary, never clavate or swollen; vH usually weakly de-veloped, short and hairlike; smaller species . . Telostylinus Enderlein4 (1). Antennal socket polished, strongly shining. NO. 3562 MALAYAN FLIES?STEYSKAL 55 (8) . Two strong equal fo; anterior ntpl strong; 4th wing vein strongly boweddownward before ta, 1st basal cell at widest part therefore nearlytwice as wide as length of ta; occiput and prothorax weakly developed.6 (7). Stump veins on 3rd and 4th veins; anterior dc strong; /i of cf with smallspinules below Stypocladius Enderlein7 (6). Stump veins lacking; anterior dc very small; /i of c?" with very heavyspines on small tubercles Nipponerius Coquillett8 (5). Only one weak /o and sometimes anterior thereto another rudimentaryone; anterior ntpl usually very weak; 4th wing vein only gently bowedbasad of ta, 1st basal cell therefore only slightly wider than lengthof ta.9 (10). Occiput and prothorax greatly lengthened, occiput nearly or quiteas long as eye Gymnonerius Hendel10 (9). Occiput and prothorax little lengthened, occiput much shorter than eye.Paranerius BigotNeither Aczel nor I have been able to place Protonerius Meijere(1924, p. 29) in our keys.Subfamily TelostylinaeThis subfamily is distinguished from the Neriinae by the lack of adistinct dorsal expansion of the facial plate at the bases of the antennae.The genus Telostylus Bigot, 1859 (type: T. binotatus Bigot, 1859) isdistinguished from the two other known genera by having only 1 nfpland 1 (prescutellar) dc, a long and pointed 3rd antennal segment, andby the basitarsusj of the cf sometimes being swollen.Nobody so far has had the temerity to offer a key to Telostylus.The following one is offered as a preliminary contribution since it isconstructed largely from descriptions?although T. philip'pinensisCresson has been pla.ced from examination of the type specimen inthe USNM, and T. niger Bezzi, from material in the USNM collectedby Baker and apparently part of the original lot. Aczel's statement(1955, p. 32) that T. binotatus Bigot is known only from Borneo iserroneous, since the original description cites Celebes only, and Aczel'sredescription from Borneo specimens must therefore be suspect.Specimens of T. binotatus that agree well with Bigot's description andthe concept here presented were taken in the Selangor GombakReserve by McClure on October 21, 1961 and October 27, 1962.Key to Species of Telostylus Bigot1 (4). Mesofrons between the eyes dull black all the way across; mesonotum,scutellum, and pleura largely or wholly black; halter yellow.2 (3). Legs yellow with preapical dark bands; 3rd antennal segment largelyyellowish; dull black supra-alar spot present; wing length 3.75 mm;basitarsusi of cf not broadened (Philippine Islands) . . T. niger Bezzi3 (2). Legs black; 3rd antennal segment black; mesonotum wholly shiningblack; wing length 5.5 mm; ? cf basitarsusi broadened (type 9, Sumatraand Thailand) T. apicatus Edwards 4 NO. 3562 MALAYAN FLIES?STEYSKAL 7Entom. Berlin-Dahlem, vol. 8, p. 21.?Frey, 1964, Notulae Ent., vol. 44,p. 19.Stenopterella Malloch, 1931, Proc. U.S. Nat. Mus., vol. 78, no. 15, pp. 13, 16.Enderlein designated Plagiostenopterina trivittata (Walker) as typeof Meringomeria, although he also included P. aenea (Wiedemann),which is the type of Plagiostenopterina. Malloch cited P. trivittataalso as the type of Stenopterella, distinguishing it from other segregatesof Plagiostenopterina in a key and included therewith also P. marginata(Wulp) and a new species, P. trivittigera Malloch. Hennig and Freyhave indicated the synonymy of Stenopterella. The nature of the "spiracles" of the 4th and 5th tergites of the female, well within thesclerotic margins, would seem doubtful, but a macerated specimen ofP. trivittata does indeed show large ramose tracheae connected withthem. I prefer to maintain Meringomeria as a subgenus and offerthe following key to include all of the species that can be brought intoit at this time, although information on the position of spiracles ofthe idtimate preabdominal segments is not available for P. neurostigmaBezzi, P. pallidipes Frey, and P. olivacea Hendel.Key to Species of Plagiostenoptenna Subgenus Meringomeria 1 (2). Wing with cloud about tp and isolated spot anterad thereof dark brown;costal cell hyaline P. neurostigma Bezzi2 (1). Wing without such markings.3 (8). Mesonotum lightly clayey-yellow pruinose without shining longi-tudinal vittae.4 (5). Cx and/ dark brown; 9: spiracles of 5th tergite far mesad of lateralmargins, but somewhat closer thereto than to each other and nearposterior margin P. marginata (Wulp)5 (4) . Femora nearly wholly yellow.6 (7). Mesonotum with distinct blackish dc lines interrupted at suture;abdomen wholly greenish P. olivacea Hendel7 (6). Mesonotum without such lines, with only faint traces of brownish dclines; abdomen with yellowish transverse bands; 9: spiracles of 5thtergite close to lateral margins .... P. leytensis, new species8 (3). Mesonotum with pair of longitudinal shining stripes.9 (10). Pruinosity of mesonotum whitish, rather light; cx and/ blackish; 9:spiracles of 5th tergite distant from lateral margins, twice as far fromeach other as from posterior margin ... P. planidorsum (Walker)10 (9). Pruinosity of mesonotum yellowish, heavy; at least /j largely yellowish.11 (14). Costal cell hyaline.12 (13). Base of abdomen wholly greenish; costal wing margin from stigma toend of 4th vein with continuous brown seam; 9: spiracles of 5thtergite? P. pallidipes Frey13 (12). Base of abdomen yellowish; wings with apical spot isolated from darkbrown stigma by hyaline space; 9 ?' spiracles of 5th tergite only theirdiameter from each other and from posterior margin.P. hebes Hendel 8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 12014 (11). Entire costal margin of wing from root to end of 4th vein with brownseam; abdomen wholly greenish.15 (16). Shining mesonotal vittae gradually tapered posteriorly; abdomen withdense, yellow pruinose anterior tergal margins; 9: spiracles of 5thtergite near anterior margin, only twice their diameter from eachother, surface of tergite dull P. trivittata (Walker)16 (15). Shining mesonotal vittae tapered rather suddenly at posterior end;pruinose tergal margins of abdomen faint; ? : spiracles of 5th tergitenear posterior corners, widely separated, surface of tergite shining.P. trivittigera MallochPlagiostenopterina (Meringomeria) hebes HendelPlagiostenopterina hebes Hendel, 1914, Abhandl. Zool.-Bot. Ges. Wien, vol. 8, p. 70.The type and only described specimen is a male from Singapore.McCliire captured a female on the Selangor Gombak tree platform,on May 7, 1961, which agrees very well with Hendel's description.Spiracles of 5th tergite as in preceding key, those of 4th tergite nearposterior corners ; front dull blackish with very narrow shining medianlongitudinal stripe and many black hairs; abdomen shining, lightlytransversely carinulate, and with black hairs on all dark parts, whitishhairs at the yellowish base.Plagiostenopterina {Meringomeria) leytensis, new speciesFemale.?Length of wing 6.5 mm.Head brownish yellow; antennal grooves and pair of ill-definedoccipital spots piceous; 3rd antennal segment, palpus, and front brown.Hairs of front whitish to yellowish. Medifrons wholly dull.Thorax largely brownish; middle of mesonotum, mesopleuron, andsternopleuron metallic greenish; nearly entire thorax covered withmoderately dense whitish tomentum or coarse pruinescence, that onmesonotum uniform and not showing shining stripes, but with atrace of brownish dorsocentral lines; all hairs whitish to yellowish,except a few black ones on anterodorsal corner of mesopleuron andadjacent humerus; all bristles black.Legs with all ex and / yellowish, only /a with small black antero-apical spot; t black, only basitarsusa brown. Bristles of ex, d and vrows of /i , and 6-8 bristles and several hairs on dorsal third of f^black; all other vestitm-e of/ (hairs) whitish.Wings light yellowish hyaline, entire costal margin from root totip of 4th vein with dark brown seam, broadest near tip of wing.Basal 4/5 of 2nd basal cell and basal half, except narrow strip alonganterior edge, of anal cell bare. Squamae and their fringes whitish.Halter blackish.Abdomen metallic greenish black; compound 1st dorsal segmentwith transverse pruinose yellowish band in 3rd quarter; basal 2/5 NO. 3562 MALAYAN FLIES?STEYSKAL 9 of next 2 segments and diffuse basal part of last (5th) preabdominalsegment yellowish; entire 5th tergite pruinose; yellowish parts andentire 5th tergite covered with whitish pile; apical part of basaltergite and dark apical parts of 3rd and 4th tergites covered withmoderately dense and long, recumbent rufous hairs; spiracles of 4thtergite narrowly within apical corners of tergite; those of 5th tergitenarrowly within lateral margins of tergite opposite base of ovipositor;basal segment of ovipositor piceous, with many erect whitish hairs.HoLOTYPE.?Female, Tacloban, Leyte, Philippine Is. (Baker),USNM 67978.This species, as shown in the preceding key, is apparently mostclosely related to Plagiostenopterina marginata (Wulp) and to P.olivacea Hendel, should the latter be found definitely to belong toMeringomeria.Plagiostenopterina (Meringomeria) planidorsum (Walker)Charax planidorsum Walker, 1860, Trans. Ent. Soc. London (new series),vol. 5, p. 325.?Hendel, 1914, Genera Insectorum, fasc. 157, p. 50; 1914,Abhandl. Zool.-Bot. Ges. Wien, vol. 8, p. 53.Plagiostenopterina (M.) planidorsum (Walker).?Frey, 1930, Notulae Ent., vol.10, p. 51.One pair, Selangor Gombak Forest Reserve, tree platform, 9Nov. 10, 1962, d" Jan. 19, 1963. Walker described a female fromBurma, Hendel expressed an opinion that the species might be relatedto P. trivittata (Walker) , and Frey made the combination and recordedthe species from Palawan. The Malayan specimens agree well withWalker's description and are indeed close to P. trivittata (see key, p. 7).Plagiostenopterina (Meringomeria) trivittigera MallochPlagiostenopterina (Stenopterella) trivittigera Malloch, 1931, Proc. U.S. Nat. Mus.,vol. 78, no. 15, p. 17.Selangor Gombak Forest Reserve, tree platform, 2 cf , 1 9, May 7,1961; 2 9, May 13, 1961; 1 9, Sept. 29, 1962. These are apparentlythe second recorded captures. The specimens agree well with thetype from Singapore in the USNM.Family SepsidaeDicranosepsis coryphea, new speciesFiGUKES 2a-/Male.?Length of body 3.4 mm; wing 2.5 mm.General color metallic purplish black; propleura reddish brown;labellae and most of legs yellowish; /2 and /a becoming dark brownapically; base and apex of ^3 brown; apical swollen part of t^ black; 10 PROCEEDINGS OF THE NATIONAL MUSEUM apical 2 or 3 segments of all tarsi brown; basimesal spot on 3rd antennalsegment reddish brown.Head (fig. 2e): front shining, at antennae 0.66 as broad as at levelof anterior ocellus; cheeks very narrow, without outstanding posteriorbristle; 3 moderately developed vibrissae.Thorax with mesonotum very lightly brownish pruinose; with thefollowing white pruinose areas: anterior part of humeral grooves. Figure 2. ? Dicranosepsis coryphea, new species: a, wing; b, middle leg, posterior view;c, forefemur and tibia, anterior view; d, foreleg, less tarsus, posterior view; e, head, profileview; /, male abdomen, apex.lateral stripe on notopleuron, stripe above cxx on propleuron and foronly a short distance on sternopleuron, posterior half of sternopleuron,entire hypopleuron (lightly). Chaetotaxy: \ h, 2 ntpl, 1 sa, 2 dc,2 sc, 1 mspl.Wing pale brownish hyaline, at root and in humeral and larger partof costal cell dark brown; venation as in figure 2a; halter yellowish;squama and its long cilia yellowish. NO. 3502 MALAYAN FLIES?STEYSKAL HLegs (figs, 2h--d) : cxj C-shaped, with heavy pilose ventral projection(fig. 2d) ; /i with strong triangular median projection and withoutbasal hairs or bristles (figs. 2c, d) j/a and /a with bristles ;/3 moderately-swollen (fig. 26) ; U with ventral bristle near tip, latter shining black,dilated into 2 roundish tubercles and with 3 curved, preapically com-pressed and broadened bristles (fig, 26).Abdomen smooth and shining; segment 3 strongly constrictedbasally; segment 2 without strong bristles; segment 3 and posteriorsegments with well-developed bristles, most of which are approximatelyhalf as long as apical epandrial pair (fig, 2f). Postabdomen black,processes of epandrium each ending in pair of slender, mesally directedprongs.HoLOTYPE.?Male, Malaya, Selangor Gombak Forest Reserve, treeplatform, Oct. 20, 1962 (H.E. McClure), USNM 67579.This species is evidently close to Dicranosepsis hicolor (Wiedemann) , a taxon including a number of entities that Hennig has consideredto be members of a "Formengruppe." The peculiar modification ofU in D. coryphea has not been mentioned in connection with any of theother forms or related species.The genus Dicranosepsis Duda has been placed by Hennig as asynonym or possible subgenus of the neotropical genus PalaeosepsisDuda, but the relationships and rank of these taxa need furtherstudy and at present I prefer to consider them as distinct genera.Family MuscidaeDichaetomyia prolixa (Walker)? new combinationAricia prolixa Walker, 1864, Journ. Proc. Linn. Soc. London, vol. 7, p. 218.Spilogaster prolixa (Walker).?Stein, 1901, Zeits. Hym. Dipt., vol. 4, p. 205.Mydaea prolixa (Walker).?Stein, 1918, Ann. Mus. Nat. Hung., vol. 16, p. 185. ? S6guy, 1937, Genera insectorum, fasc. 205, p. 289 (in list of "species dubiaevel incerti generis")-One female, Selangor Gombak Forest Reserve, tree platform, Dec.23, 1962, agrees well with Walker's description. The species is rathercharacteristically colored, mesonotum reddish with broad centralblackish stripe stopping at yellowish scutellum, abdomen largelyyellowish with posterior margins of tergites 3 and 4 rather broadlyblackish, and tergite 5 with a pair of well-developed, oval, black lateralspots, legs with all/ and ti and U yellowish, and all tarsi blackish; 4postsutural dc bristles.Although clearly a Dichaetomyia, the species is not to be found inMalloch's keys (1925a, p. 324; 1925b, p. 323) nor in his key of 1929(p. 401), where it runs to D. rufa (Stein), a species with a whollyreddish mesonotum. 12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 120Genus Fraserella, new nameFraseria Malloch, 1932, Ann. Mag. Nat. Hist., vol. 10, no. 10, p. 309 [type byoriginal designation: F. fulvomaculata Malloch]?Seguy, 1937, Genera insec-torum, fasc. 205, p. 378. [Preoccupied by Fraseria Bonaparte, 1854 (Aves).]Both Malloch and Seguy have referred this genus to the Muscinae,although it is not very conformable therein. The thoracic squama,being in close contact with the base of the scutellum and with straight-ish apical margin, would seem to indicate such a reference. InSeguy's key (1937, p. 370), the type species traces easily by its hairyeyes ; the two additional species I am including at this time, however,have eyes that are scarcely hairy at all and will therefore run toMesembrina or Muscina. Malloch, in his unpublished key to worldgenera of Muscidae (now on file in USNM), compares Fraseria toMesembrina and distinguishes the former by its bare pteropleuron.Malloch, however, also brings out Fraseria in two other places,comparing it in the first instance with Bryantina and Balioglutum(distinguished from those genera by its wholly hairy arista, lack ofany seta on wing veins except costa, and 4 postsutural dc) and inthe other instance with Gymnodia (distinguished by plumose aristaand strong presutural acr) . Fraserella resembles Muscina in manyrespects, but the flattish abdomen and quite differently bristled ^3,including a distinct calcar, of Muscina separate it from Fraserella.The new species described below is not very similar to F.fulvomaculata,but it fits no better with any other genus than Fraserella and hardlyseems distinct enough to require a new genus. I am indebted toRoger W. Crosskey, Commonwealth Institute of Entomology, London,for notes on the type of F. fulvomaculata and for pointing out thatPhaonia corbetti Malloch should also be referred to Fraserella. Thedevelopment of the latter species was described by J. S. Sewill (1931,pp. 233-235) as taking place in the inflorescence of nipa palms andit is possible that the new species has a similar habitat.Fraserella altivolans, new speciesFigures 3, 4Male.?Length of wing 8.25-8.5 mm.Color generally black; 1st, 2nd, and base of 3rd antennal segmentsreddish; oral margin between vibrissae reddish; infraocular bare areabrownish; all bristles and hairs black, except very short whitishmarginal cilia of thoracic squama.Head proportions (fig. 3c): front at narrowest part 0.115 of totalwidth of head ; medifacies strongly narrowed at insertion of vibrissae;arista as in figure 3d, long plumose; anterior ommatidia approximatelytwice as great in diameter as posterior ones; bristles and hairs similar MALAYAN FLIES?STEYSKAL 13 to those of female (fig. 36) ; occipital ocular margin bare, whitishpruinose.Thorax with changeable pruinosity, when viewed from rear withcentral stripe, stripes in lines of dc bristles, and broad lateral areas,grayish. Chaetotaxy: 4 ^ in row; 2 ntpl; 1 si; 1 'prs; 1 small praand 3 strong sa, 3 ya; 2 small posterior ia; 2+4 dc; 3 strong presu-tural acr and several much smaller and finer pairs of postsuturalacr ending in row of 6 strong prsc; 6 marginal sc; 1 jpjpl and 1 strongstigmatal, each accompanied by a group of long strong bristly hairs,l-{-2 stj)!, the posterior 2 close together; complete row of about 18 Figure 3. ? Fraserella altivolans, new species: a, female head, profile; b, male wing; c,diagrammatic male head, anterior and lateral views; d, male arista.posterior mspl. All thoracic hairs long and coarse, only the follow-ing areas bare: prosternum, center of propleuron, oblique stripe fromcenter of mesopleuron to just posterad of cxi, pteropleuron, hypo-pleuron, supra-alar and postalar declivities (except a few small hairsjust below ya), suprasquamal ridge, lower surface of scutellum, me-tanotum. Sides of scutellum with many coarse hairs.Legs simple, only /a quite slender in apical fourth ; claws and pul-villi moderate in size. Chaetotaxy: /i with 2 complete rows of jpd,1 complete row of long pv; U with short median p and many shortad; fi with 5 pv shorter than femoral diameter, about as many avonly half as long as pv, and 3 closely adjacent preapical pd; U with2 ^ in apical half, l|c? and 4 v preapicals ; /s with complete comb ofdensely placed disticlinate bristly ad hairs about as long as femoral 14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 120diameter, complete row of about 20 av (about 5 of which definitelybristles, others hairlike), a series of fv bristly hairs in basal halfsimilar to av series; t^ with 5 median av somewhat shorter than tibialdiameter, some bristly 'pd hairs (a sHghtly larger one at apical thirdmight be called calcar), distinct apical d and av, other apicals nolarger than surrounding bristly setae. T3 is distincly compressed onapical half of posterior surface and is furnished with a narrow butdeep sulcus in ^(/ middle half. Cx^ bare at apex above.Wing (fig. 3a) hyaline; veins brown to black, only swollen base ofcosta as far as humeral crossvein yellowish; tegula and basicostal scaleblack; alar squama with blackish margin; thoracic squama closelyadjacent to base of scutellum, with nearly straight apical margin,white and with very short whitish marginal cilia; costal vein at swollenbase with rather long bristles, otherwise with very short depressedspinules; all other veins bare; halter with dark brown knob.Abdomen rotund, swollen, covered dorsally with yellow pruinosityin somewhat changeable pattern, giving it a finely peppered appear-ance, except on basal 2/3 of 1st apparent tergite. Whole surface ofabdomen covered with fairly dense decumbent hairs, marginal seg-mental hairs somewhat longer and more bristle-like; 1st ventralsegment hairy. Postabdomen as in figures 4a-c; 5th sternite withbroad, V-shaped emargination and 2 digitate apical protuberances(fig- 46).Female.?Wing length 7.9-8.6 mm. Similar to male, except asfollows.Head (fig. 36): front slightly broader anteriorly, 0.38 of totalwidth of head; anterior ommatidia 1.25 times as large as posterior ones.Legs with ji bearing complete rows of long 'pd and pv and smallgroup of medial a\ ti with 1-2 pd in apical half, nearly complete rowof 9-10 rather short ad, long apical ad, pd, and pv; U lacking the regularpalisade of ad of male, but with a number of irregular bristles, of which2 near middle stand out; ^3 also with pd bristles a little coarser thanin male, but calcar no more distinct; posterior compression andsulcus as in male.Abdomen in general appearance much as in male; postabdomen asin figure 4