DIPTERA FROM NEPAL 65 



Holotype^. East Nepal : Taplejung District, damp evergreen oak forest above 

 Sangu, c. 9,200', 2-26.xi.1g61 (R.L.C.), BMNH. 



Allotype $. Same data as holotype (R.L.C.), BMNH. 



Paratypes : 3 $, same data as holotype (R.L.C.), BMNH, 1 $ at the Tokyo 

 Metropolitan University. 



Closely resembles S. nigrita Wheeler, 1952, (N. America) but differs slightly in 

 having deep velvety black, not pollinose, large ocellar triangle and front only 

 orange anteriorly. 



DIATHONEURA Duda 

 Diathoneura Duda, 1924a : 180. 



Type-species : Drosophila taeniatipennis Duda, 1925 : 168 ; designated by 

 Malloch, 1934 (S. America). 



Diathoneura ripa sp. n. 



(Text-figs. 274-279, p. 94) 



cJ, <j>. Body about 2 mm., small, glossy black. Head slightly broader than thorax. Eyes 

 large, dark reddish brown, with thick pilosity. Antennae black, third segment oval and with 

 grey pubescence, apically widely apart from face. Palpus black, with a prominent apical bristle. 

 Ocellar triangle black, convex, straight somewhat glossy. Periorbit black, slightly glossy, 

 posteriorly somewhat narrowing, anteriorly blunt, not reaching anterior margin of front. Front 

 evenly black, matt, grey pollinose, anteriorly grey, slightly broader than length down middle, 

 posteriorly broader and slightly narrower than head width. Clypeus black. Face black, flat, 

 parallel-sided, whitish between second segments of antennae. Carina entirely absent. Cheeks 

 black, narrow, about one-ninth as broad as the greatest diameter of eye. Occiput black. Anter- 

 ior reclinate orbital slender, half as long as proclinate, one-fourth as long as posterior reclinate, 

 about twice as distant from posterior reclinate as from proclinate. Proclinate inside other 

 orbitals. Vibrissae long, second oral one-third as long as vibrissae ; other orals shorter. Post- 

 verticals fine, very short. 



Mesonotum black, glossy, with fine punctures. Scutellum black, somewhat grey pollinose. 

 Thoracic pleura glossy black. Two long humerals. No prescutellars. No propleurals. 

 Acrostichal hairs in six to eight rows. Anterior dorsocentrals two-thirds as long as posteriors ; 

 distance between anterior and posterior dorsocentrals half distance between anterior pair. 

 Anterior scutellars divergent, slightly longer than posteriors, which are equally distant from 

 each other and from anteriors. Sterno-index about 07. No prominent median sterno- 

 pleural. Legs short, thick, dark brown, femora black. All metatarsi as long as the other segments 

 together. Preapicals on all legs ; apicals on fore and mid legs. Wings hyaline, relatively 

 slender, veins pale yellow, crossveins not clouded, tip rounded. i? 2 +3 straight, curved to costa 

 at tip. i?4+ 5 and M distally somewhat convergent. C-index about 2 -3 ; 4V-index about 3-1 ; 

 4C-index about 2-6 ; 5x-index about 3-1 ; Ac-index about 5-3. Ci-bristles only one ; C3- 

 fringe on basal five-eighths. Ffalteres white. Abdominal tergites entirely black, somewhat 

 glossy. Abdominal sternites pale brown, small, elongate. 



Periphallic organs : Genital arch black, dorsally slightly narrowing, setigerous ventro- 

 posteriorly ; toe deep black, rounded ; heel somewhat high. Clasper black, crescentic, 

 dorsally narrowly pointed, with a slightly concave row of about thirteen black teeth on entire 

 distal margin. Anal plate fusiform, greyish black, setigerous, narrowly pointed ventroposterior- 

 ly. Phallic organs : Aedeagus black, short, apparently bifurcated and hooked apically, 



