82 T. OKADA 



9 $ sex-combs larger, in two oblique sets on metatarsus. Second oral nearly as long as 



vibrissae .......... bipectinata (p. 95) 



- <J sex-comb smaller, transverse. Second oral much shorter than vibrissae . . 10 



10 Acrostichal hairs in six rows. Anterior reclinate orbital about half as long as 



posteriors, one-third as long as proclinate. Distance between anterior and post- 

 erior dorsocentrals about two-fifths distance between anterior pair immacularis (p. 87) 

 Acrostichal hairs in eight rows. Anterior reclinate orbital one-third as long as 

 other orbitals. Distance between anterior and posterior dorsocentrals about half 

 distance between anterior pair ..... takahashii (p. 92) 



11 Front nearly parallel-sided. Periorbit greyish brown, posteriorly narrowing, 



anteriorly curved inward. Anterior scutellars convergent. . . kikkawai (p. 92) 



- Front considerably narrowed anteriorly. Periorbit black, narrow, anteriorly not 



curved inward. Anterior scutellars divergent . . . trapezifrons (p. 93) 



The MOM MAI Group 



<$ foreleg without sex-comb. Mesonotum highly convex. Anterior reclinates 

 orbital minute. Only one prominent oral. Anterior paramere of phallic organs 

 large, hairy, usually with a longitudinal row of sensilla. Aedeagus hairy, often 

 with a pair of basal elongate processes. 



Drosophila (Sophophora) coei sp. n. 



(Text-figs. 226-231) 



o", $. Body about 1 -8 mm. Head slightly broader than thorax. Eyes deep purplish red, 

 fusiform, relatively small, pilose. Antennae with second segment yellowish orange, third 

 greyish orange and triangularly pointed. Palpus black, slender, with a long terminal seta. 

 Ocellar triangle deep reddish brown. Periorbit glossy greyish white, somewhat convex, broad, 

 three-fourths as long as front. Front greyish white, glossy. Carina high, broadened below. 

 Clypeus brown. Cheeks yellowish brown, about two-sevenths as broad as the greatest diameter 

 of eye. Occiput yellowish brown, centrally somewhat fuscous. Postverticals rather short. 

 Anterior reclinate orbital minute, outside and slightly posterior to proclinate, somewhat nearer 

 to proclinate than to posterior reclinate. Proclinate about three-fourths as long as posterior 

 reclinate. Vibrissae long ; second oral half as long as vibrissa, others shorter. 



Mesonotum glossy brown or yellowish brown, sometimes deep brown, strongly convex, 

 laterally with a dark longitudinal stripe. Scutellum glossy brown or deep brown, unicolorous. 

 Thoracic pleura pale, glossy, dark brown below. Humeral callus mostly dark brown. Only 

 one long lower humeral, upper one very fine. Acrostichal hairs in six rows. Anterior dorso- 

 centrals three-fifths as long as posteriors ; distance between anterior and posterior dorsocentrals 

 about half distance between anterior pair. Anterior scutellars parallel or convergent, as long as 

 posteriors, which are nearer to each other than to anteriors. Sterno-index about 0-4. Legs 

 yellow, glossy, relatively slender ; tarsi fuscous ; coxae white, fore coxa sometimes black (in 

 darker specimens) ; all metatarsi subequal to the next segments together. Preapicals on all 

 legs ; apicals prominent on fore and mid legs. Wings relatively large, somewhat fuscous, veins 

 yellow, crossveins clear. Costa reaching M, R 2 +3 nearly straight and apically curved to costa ; 

 i? 4+5 and M somewhat convergent distally. C-index about 2-7 ; 4"V-index about 1 -8 ; 4C- 

 index about 10 ; 5x-index about 1-5 ; Ac -index about 2-5. Ci-bristles two ; C3-fringe on 

 basal one-fourth. Halteres yellow. Abdomen slender and dorsally convex, tergites mostly 

 glossy black. Female cercus yellow or yellowish brown, triangular in dorsal aspect. 



Periphallic organs : Genital arch black, pubescent and setigerous, broad, ventrally triangular, 

 caudal margin with a large acute triangular projection below anal plate, deeply incised below 

 the projection. Anal plate black, relatively small, narrow fusiform, setigerous and pubescent, 

 separated from genital arch, ventrally exceedingly narrowing and with a few stout short black 



