DIPTERA FROM NEPAL 79 



Closely similar to D. (H.) denticeps Okada and Sasakawa, 1956 (Japan), especially 

 in male periphallic organs and female egg-guide, but differing from it and also in 

 general from species of the subgenus in having two ventral branches of arista and 

 well developed preapicals on all legs. This species is, consequently, only tentatively 

 included in the subgenus Hirtodrosophila. 



Drosophila (Hirtodrosophila) limbicostata sp. n. 



(Text-figs. 221-225) 



$. Body about 2 mm. Head slightly broader than thorax. Eyes dark purplish brown, 

 large, with thick pilosity. Antennae with second segment conical, yellowish brown, medio- 

 laterally dark ; third black, large, and rounded. Arista with about two dorsal and one ventral 

 short branches and a fine terminal fork. Palpus yellowish orange, thick, tip rounded, with a 

 few short black apical and ventral setae. Ocellar triangle large, black, grey pollinose, convex. 

 Periorbit posteriorly somewhat narrowing, black, grey pollinose, anteriorly nearly reaching 

 anterior margin of front. Front velvety black, nearly parallel-sided, anterior half deep orange- 

 brown anteriorly as broad as length down middle, posteriorly two-fifths as broad as head width. 

 Clypeus brown. Face grey, concave. Carina grey, narrow, low, less than half length of face. 

 Cheeks narrow, yellow, about one-eighth as broad as the greatest diameter of eye ; postgena 

 black. Occiput black. Postverticals short. Anterior reclinate orbital slightly shorter than 

 proclinate, which is as long as posterior reclinate. Three orbitals nearly equally distant from 

 eye margin, anterior reclinate equidistant from proclinate and from posterior reclinate. 



Mesonotum dark chestnut-brown, somewhat glossy, with fine yellow punctures. Humeral 

 callus pale yellowish grey. Scutellum dark yellowish brown, medially and anterolaterally 

 blackish brown. Thoracic pleura pale brown. Three humerals, uppermost shortest. Acro- 

 stichal hairs in eight rows. Prescutellars fine. Anterior scutellars divergent, slightly longer 

 than posteriors, which are one and a half times as distant from anteriors as from each other. 

 Postscutellum chestnut-black. Sterno-index about 1 o ; median sternopleural as long as 

 others. Anterior dorsocentrals half as long as posteriors ; distance between anterior and 

 posterior pair less than one-third distance between anterior pair. Legs yellow, last tarsal seg- 

 ment dark, claw large. All metatarsi subequal to next segments together. Preapicals on 

 mid and hind legs ; apicals prominent on mid leg. Wings somewhat fuscous, broad, tip rounded. 

 R 2 + 3 apically gently curved to costa ; 7? 4+5 and M parallel. C-index about 26 ; 4V-index 

 about 1-5 ; 4C-index about 09 ; 5x-index about 1 -6 ; Ac-index 23. Ci-bristles two, fine, 

 subequal ; C3-fringe absent, strong costal bristles ending before tip of R 2 + 3 . Halteres yellow. 

 Abdominal tergites : iT yellowish grey, others brownish black, each medioanteriorly with a 

 small triangular yellow spot. Abdominal sternites paler. 



Egg-guide lobe fusiform, apically pointed and somewhat curved downward, with about 

 eighteen marginal and five apicodiscal pale brown teeth, nine upper marginal ones arranged in a 

 compact straight row, apical tooth largest. Subterminal hair distinct. Basal isthmus yellow, 

 narrow, straight, about one-fourth length of lobe. 



Holotype $. East Nepal : Taplejung District, between Sangu and Tamrang, 

 mixed plants by damp cliff in deep river gorge, c. 5,200', 22.xi.1961 (R.L.C.), BMNH. 



Peculiar among the family Drosophilidae in having strong costal bristles ending 

 before end of R 2 +3- Somewhat similar to D. (H.) hirticornis de Meijere, 1914, 

 (Java) in having very narrow cheeks and fuscous wings, but differs from it in short 

 branches of arista, pubescent eyes, and brownish black abdominal tergites. 



