70 T. OKADA 



stichal hairs in eight rows. Anterior dorsocentrals half as long as posteriors ; distance between 

 anterior and posterior dorsocentrals about one-third distance between anterior pair. Anterior 

 scutellars parallel, long, as long as posteriors or as scutellum itself ; posteriors equally distant 

 from anteriors and from each other. Sterno-index about 07. Median sternopleural long, 

 intermediate in size between anterior and posterior ones. Legs black, femora darker. All 

 metatarsi as long as rest of tarsal segments together. Preapicals on all legs ; apicals strong on 

 mid leg. Wings hyaline, tip rounded, veins brown. Crossveins clear. Costa reaching end of 

 i? 4+5 ; i? 2 +3 medially straight, apically slightly curved to costa ; i? 4 + 5 and M parallel. C-index 

 about 1-3 ; 4"V-index about 2-2 ; 4C-index about 2-3 ; 5x-index about 2-8 ; Ac-index about 

 5-0. Ci-bristles two, subequal ; C3-fringe on basal five-sixths. Halteres black. Abdominal 

 tergites entirely black, somewhat glossy. 



Periphallic organs : Genital arch greyish brown, pubescent, not narrowing dorsally, broadly 

 truncate ventrally, ventral tip black and somewhat swollen, posterior margin with a few long 

 setae in a row, lateromedially somewhat swollen caudally. Clasper black, quadrate, lower tip 

 pointed ; distal margin broad and with a concave row of about eight strong pointed black teeth, 

 the row occupying entire length of distal margin. Anal plate greyish brown, separated from 

 genital arch, oblong, setigerous and pubescent, caudal tip truncate and with a few strong short 

 setae. Phallic organs : Aedeagus apparently bilobed, elongate, black, fusiform in ventral 

 aspect. Apodeme straight, black, slightly shorter than aedagus. Anterior paramere large, 

 dark brown, basally black, apically rounded, basally contiguous with aedeagus, with a row of 

 about four sensilla on distal half. Posterior parameres dark brown, fused to be a broad distally 

 flattened medially pale lobe. Hypandrial plate large, crescentric, dark brown, with a few 

 submedian spines. Ventral fragma broad, brown, V-shaped, marginally black. PI = 15. 

 p.f. = ABCDeFgHIKLMN. Egg-guide lobe dark brown, elliptical, apically narrowly rounded, 

 with about fourteen marginal and three discal stout black teeth, ventral margin with a pro- 

 minent subterminal hair. Basal isthmus black, one-third as long as lobe, medially broadened. 



Holotype $. East Nepal : Arun Valley, east shore of River Arun below Tum- 

 lingtar, evergreen shrubs bordering dry stream-beds, c. i,8oo', 14-23. xii.1961 

 (R.L.C.), BMNH. 



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



Paratypes : 1 <$, 2 $, same data as holotype (R.L.C.), BMNH, 1 $ at the Tokyo 

 Metropolitan University. 



Distinguished from other members of the subgenus by extremely small body. 

 Somewhat resembles D. coracina Kikkawa and Peng, 1938 (Japan and China), in 

 the shape of genital arch of male periphallic organs, but differs in having much smal- 

 ler and less glossy body and spiny clasper teeth. 



Drosophila (Scaptodrosophila) marginata Duda subgen. comb. n. 



(Text-figs. 201-206) 



Drosophila (Paradrosophila) marginata Duda, 1924a : 209 (Formosa) ; Duda, 1923 : 46 [nom. 

 nud.] (Formosa). 



o\ ?. Body about 2.4-2-8 mm. Head as broad as thorax. Eyes dark reddish brown, 

 finely pilose. Antennae with second segment brown ; third dark brown, posterior margin pale. 

 Arista with about four dorsal and two ventral branches and a fine terminal fork. Palpus yellow- 

 ish orange, with an apical and a ventral black setae. Ocellar triangle black. Periorbit greyish 

 brown, somewhat glossy, short, half as long as front, anteriorly blunt, posteriorly pale and 

 broadened. Front yellowish brown, somewhat velvety, parallel-sided, anteriorly somewhat 

 darker and as broad as length down middle, posteriorly about half as broad as head width. 



