42 T. OKADA 



anteriorly and laterally orange-brown ; anteriorly two and a half times as broad as length 

 down middle ; posteriorly about half as broad as head width. Face pale yellowish white, 

 laterally depressed. Carina high, slender, two-thirds as long as face. Occiput yellowish grey, 

 black below. Cheek pale yellowish black near neck region, about one-third as broad as the 

 greatest diameter of eye, narrow below. Proclinate orbital two-thirds length of posterior 

 reclinate, outside and slightly anterior to posterior reclinate ; anterior reclinate minute, just 

 outside posteriors, twice as distant from proclinate as from posterior reclinate. Only one very 

 stout and long oral. 



Mesonotum glossy yellowish brown, mediocaudally and laterally dark brown, or uniformly 

 dark brown. Scutellum dark yellowish brown, glossy, often medially and marginally pale. 

 Thoracic pleura yellowish white, with broad black longitudinal stripe above. Humerals two, 

 very long, stout, subequal in length. Acrostrichal hairs in six rows. Anterior dorsocentrals 

 near the level of suture ; distance between anterior and posterior dorsocentrals subequal to 

 distance between anterior pair. Anterior scutellars short ; posteriors long, divergent, thrice as 

 long as anteriors. Sterno-index about 0-5. Legs fuscous yellow, femora pale on proximal half. 

 Preapicals on all legs ; apicals prominent on mid leg. Wings hyaline, crossveins clear, tip 

 slightly pointed, cosla reaching M. i? 2+3 apically curved to costa ; /? 4 + 5 and M parallel. 

 C-index about 1-3 ; 4V-index about 36 ; 4C-index about 22 ; 5x-index about 50 ; Ac-index 

 about 4-4. Ci-bristles two, long; C3-fringe on basal ten-elevenths. Halteres greyish black. 

 Abdominal tergites mostly black, glossy ; abdominal sternites yellowish white. 



Periphallic organs : Genital arch yellow, broad, narrowing below, pubescent, setigerous on 

 upper caudal margin, ventral apex pointed anteriorly, caudal lower margin orange, rounded. 

 Clasper and anal plate obscure. Decasternum triangular, yellowish white. Phallic organs : 

 Aedeagus robust, orange, with several complicated triangular processes, basally narrowing and 

 with a stout recurved dark orange ventral process, which is slightly shorter than aedeagus (cf. 

 Text-fig. 117). Apodeme of aedeagus thick but short, about one-third as long as aedeagus. 

 PI = 30. Anterior paramere seemingly fused to hypandrium and with about two sensilla. 

 Posterior paramere elongate, connecting hypandrium and subbasal part of aedeagus (cf . Text- 

 fig. 117). Ventral fragma triangularly pointed proximally ; hypandrial plate large, blade- 

 like, p.f. = abCdeFgHiKlmn. Egg-guide yellow, oval, distally fuscous and with four stout 

 brownish setae and a small hair. 



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

 mixed plants by damp cliff in deep river gorge, c. 5,200', i-ii.1962 (R.L.C.), BMNH, 



Allotype $. Taplejung District, above Sangu, mixed vegetation in dried-up 

 ravine, c. 6,8oo\ 17.ii.1962 (R.L.C.) BMNH. 



Paratypes : Taplejung District, Sangu, mixed vegetation by stream in gully, 

 c. 6,200', xi. 1961-1.1962, 1 $ (R.L.C), BMNH. Arun Valley, east shore of River 

 Arun below Tumlingtar, evergreen shrubs bordering dry stream-beds, c. 1,800', 

 14-23. xii.1961, 1 $ (R.L.C), deposited at the Tokyo Metropolitan University. 



Closely resembles M. nigripalpis Okada, in having distinct broad black meso- 

 pleural longitudinal stripe, black palpus, and black halteres, but differs from its 

 allies in having less distinct mesonotal black stripes, pale ocellar triangle, and oval 

 egg-guide. 



Microdrosophila marginata sp. n. 



(Text-figs. 108-113) 



o\ $■ Body about 1-3 mm., pale yellowish brown. Head very large, much broader than 

 thorax. Eyes deep purplish red, large, thickly pilose. Antennae with second segment dark 



