DIPTERA FROM NEPAL 87 



The MELANOGASTER Group 



The SUZUKI I Subgroup 



Drosophila (Sophophora) immacularis sp. n. 



(Text-figs. 244-250) 



o*. Body about 2 mm. Head as broad as thorax. Eyes dark red. Antennae with second 

 segment yellowish orange, third yellowish grey, one and a half times as long as broad. Arista 

 with about four dorsal and three ventral branches and a large terminal fork. Palpus yellow, 

 with an apical seta. Ocellar triangle dark reddish brown. Periorbit greyish brown, posteriorly 

 narrowing, anteriorly rounded, not reaching anterior margin of front. Front somewhat glossy 

 greyish brown, anteriorly orange and as broad as length down middle, posteriorly broadened and 

 about four-ninths as broad as head width. Clypeus pale brown. Face greyish white, parallel 

 sided. Carina high, long, anteriorly somewhat broadened. Cheeks yellowish orange, one-sixth 

 as broad as the greatest diameter of eye. Occiput yellowish brown, fuscous below. Anterior 

 reclinate orbital about half posterior reclinate and two-thirds as long as proclinate, twice as far 

 from posterior reclinate as from proclinate. Proclinate inside others. Postverticals long. 

 Second oral half as long as vibrissa, succeeding orals shorter. 



Mesonotum dark yellowish brown, somewhat glossy, medially with a darker longitudinal 

 stripe. Scutellum greyish brown, slightly glossy. Thoracic pleura paler, unicolorous. Two 

 long subequal humerals. Acrostichal hairs in six rows. Anterior dorsocentrals half as long as 

 posteriors ; distance between anterior and posterior dorsocentrals about two-fifths distance 

 between anterior pair. Anterior scutellars convergent, as long as posteriors, which are nearer to 

 each other than to anteriors. Sterno-index about 07. Median sternopleural slightly shorter 

 than anteriors. Legs yellow ; 5* fore tarsus with a terminal transverse sex-comb composed of 

 five black bristles ; second tarsal segment with a similar sex-comb of two bristles. All meta- 

 tarsi subequal to the next three segments together. Male mid leg with black hooked scaly 

 bristles, four at the apex of tibia and one at the proximal end of metatarsus. Preapicals on all 

 legs ; apicals on fore and mid legs. Wings hyaline, crossveins clear ; costa weak beyond i? 4 + 5 ; 

 R2+3 apically weakly curved to costa ; i? 4+5 and M parallel. C-index about 2-9 ; 4"V-index 

 about 2-2 ; 4C-index about 25 ; 5x-index about 2-2 ; Ac-index about 2-5. Ci-bristles two, 

 long ; C3-fringe on basal four-ninths. Halteres yellowish orange. Abdominal tergites yellow- 

 ish brown, each with a broad black medially entire cross-band ; iT pale. 



Periphallic organs : Genital arch elongate, fusiform, medially somewhat constricted, dorsal 

 half black, dorsal end narrowing, ventral half yellowish grey, posteriorly triangularly projected, 

 setigerous on posterior margin and ventral tip. Claspers two. Primary clasper large, brown 

 lower tip recurved, with a row of about ten long black bristles on distal margin ; secondary 

 clasper quadrate, situated above primary clasper, with a row of about eight large black teeth 

 along distal margin. Anal plate setigerous, fusiform, ventrocaudally narrowly projected. 

 Phallic organs : Aedeagus pale yellowish grey, rod-shaped, subapically pubescent, apically 

 curved and pointed dorsally ; apodeme black, straight, curved and pointed dorsally ; apodeme 

 black, straight, slightly longer than aedeagus. PI = 10. Anterior paramere black, rod-shaped, 

 basally curved to attach the base of aedeagus, apically narrowly pointed and curved, subapically 

 with a few sensilla. Posterior paramere pale yellowish grey, nearly as long as anterior paramere, 

 apically pointed, basally bilobed to attach aedeagus by one arm and to ventral fragma by 

 another. Ventral fragma quadrate, distal margin nearly straight, with a pair of short submedian 

 spines, which are close to each other, p.f. = ABcDEfGHIKLMN. 



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

 shrubs by path, c. 5,800', 6.xi.io,6i {R.L.C.), BMNH. 



Closely allied to D. (S.) suzukii (Matsumura, 1931) (China and Japan), especially 

 similar in phallic and periphallic organs, but differs in having <$ wings without black 

 patch and aedeagus distally pubescent. 



