DIPTERA FROM NEPAL in 



Drosophila (Drosophila) fuscicostata sp. n. 



(Text-figs. 323-327) 



cJ. Body about 3 mm. Head as broad as thorax. Antennae with second segment brown ; 

 third greyish brown, slightly longer than broad. Arista with about four dorsal and one ventral 

 branches and a large terminal fork. Palpus yellowish brown, ventrally with about two black 

 setae. Ocellar triangle black, marginally grey pollinose. Periorbit glossy greyish brown, 

 posteriorly broadened, two-thirds as long as front. Front orange, anteriorly somewhat narrow- 

 ing and slightly broader than length down middle, posteriorly fuscous and broader than half 

 head width, caudolaterally black and grey pollinose outside insertion of postverticals. Face 

 glossy brown ; buccal margin strongly convex. Carina high, short, medially whitish grey, 

 broader below. Cheeks yellowish grey, dark at bases of orals, broad, about two-ninths as broad 

 as the greatest diameter of eye. Occiput yellowish grey, black below. Anterior reclinate 

 orbital slender, about one-third as long as posterior reclinate, half proclinate, slightly nearer to 

 proclinate than to posterior reclinate ; proclinate inside others. Postvertical moderate in size. 

 Second oral fine, about two-fifths as long as vibrissa ; succeeding orals finer. 



Mesonotum orange-brown, matt, posteriorly and laterally dark glossy brown. Scutellum 

 brown, anterolaterally and apically yellowish orange, with two diffuse black stripes. Thoracic 

 pleura black, grey pollinose, pale along suture. Only one long humeral. Acrostichal hairs in 

 six rows. Distance between anterior and posterior dorsocentrals about half distance between 

 anterior pairs. Scutellars missing. Posterior scutellars nearer to each other than to anteriors. 

 Sterno-index about o-6 ; median stcrnopleural half as long as anteriors. Legs yellowish grey ; fore 

 femur anteroventrally with a row of about twelve black spinules on distal two thirds ; femora 

 black except at ends ; tibiae fuscous, with indistinct dark rings subbasally and subapically. 

 Front and mid metatarsi subequal in length to next three segments together, hind metatarsi 

 longer than the rest of segments together. Wings extensively fuscous from costal margin up 

 to below R 2 + 3 , in the cell i? 4 + 5 before anterior crossvein, along M, and along crossveins. R 2 +3 

 straight, not curved to costa apically ; i? 4 + 5 and M somewhat convergent distally. C-index 

 about 3-8 ; 4V-index about 17 ; 4C-index about 0-7 ; 5x-index about 11 ; Ac-index about 

 2-3. Ci-bristles two ; C3-fringe on basal two-thirds. Halteres yellow. Abdominal tergites 

 matt yellowish grey, each with a glossy black caudal transverse band, which is laterally curved 

 anteriorly, medially interrupted on 2-3T, medially contiguous and projected anteriorly on 

 4-5T ; iT mostly yellow ; 6T black. 



Periphallic organs brownish black. Genital arch not narrowing above, ventrally rounded, 

 setigerous and pubescent. Clasper projected below genital arch, ventrally prolonged, with a 

 slightly concave row of about ten stout black teeth occupying nearly entire distal margin. Anal 

 plate setigerous and pubescent, dorsally tapering, ventrally broadened and with numerous short 

 stout black bristles. Phallic organs : Aedeagus orange-brown, straight, subapically broadened 

 and dentated on lateral sides, proximally tapering, subbasally with an elongate distally black 

 and caudally pointed dorsal appendage. Anterior paramere small, conical, distally with about 

 two sensilla. Hypandrial plate pale yellow, marginally black, broad, elliptical, with a stout 

 submedian spine, p.f. = ab'Cdefg HIklMn. 



Holotype <$. East Nepal : Taplejung District, Sangu, mixed vegetation by- 

 stream in gully, c. 6,200', xi. 1961-1.1962 (R.L.C.), BMNH. 



Somewhat resembles D. hypocausta Osten Sacken, 1882 (Philippines, Java, 

 Sumatra, and Caroline Islands) in having black femora, black thoracic pleura, and 

 apically pale scutellum, but differs from it in having six rows of acrostichal hairs 

 (eight in hypocausta), only one strong oral (two strong in h.), anteriorly fuscous 

 wings, only one ventral branch of arista (four in h.), ventrally setigerous anal plate 

 and long dorsal projection of aedeagus. 



