76 T. OKADA 



Periphallic organs : Genital arch black, pubescent, medially and apically bare, with a few 

 setae, ventrally conically projected, caudal margin rectangular above insertion of clasper. 

 Clasper black, ovoid, with a row of about eleven black teeth along entire distal margin, median 

 teeth smaller than upper and lower teeth. Anal plate white, pubescent and setigerous, narrow 

 and long, dorsally somewhat narrowing. Phallic organs : Aedeagus robust, dark brown, 

 apparently bifid laterally, quadrate in lateral aspect, caudodorsally round, upper margin truncate 

 and with a few serrations. Basal apodeme shorter than aedeagus. PI = 1-5. Anterior 

 paramere small, conical, contiguous to hypandrium, medially with a few sensilla. Ventral 

 fragma black, semicircular, with a very deep and wide median notch and a median process 

 projected from the bottom of the notch, laterally with submedian spines, p.f. = ab'CdeFg HI 

 kLMN. Egg-guide lobe deep brown, fusiform, with about ten marginal and four discal dark 

 brown teeth, apical one largest and directed ventrally. Anal cercus of female yellow, elongate. 



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

 mixed plants by damp cliff in deep river gorge, c. 5,200', 22.xi.1961 (R.L.C.), BMNH. 



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



Paratypes : Taplejung District, 1 $, same data as holotype ; 1 $, 2 <$, Sangu, 

 mixed vegetation by stream in gully, c. 6,200', xi. 1961-1.1962 ; 1 <$, 2 $, between 

 Sangu and Tamrang, mixed plants by damp cliff in deep river gorge, c. 5,200', 

 i-ii.1962 ; 4 $, 1 ex. (abdomen missing), river banks below Tamrang Bridge, c. 

 5,500', x-xi.1961. 1 $, Arun Valley, east shore of River Arun below Tumlingtar, 

 c. 1,800', 14-23. xii. 1 96 1 (R.L.C.), BMNH ; 1 ^ and 1 $ from between Sangu and 

 Tamrang, deposited at the Tokyo Metropolitan University. 



Resembles D. (Dichaetophora) suruk Burla, 1954 (Ivory Coast, Africa), in having 

 rather well developed anterior dorsocentrals, which are widely distant from posterior 

 dorsocentrals, but differs from the latter in having only one ventral branch of arista 

 (three in suruk), front narrower than length down middle (broader in s.), six rows of 

 acrostichal hairs (four in s.), R i+5 and M not sinuated (much sinuated in s.), and male 

 anal plate narrow and long (broad in s.). 



Drosophila (Dichaetophora) raridentata Okada and Chung 

 (Text-figs. 214-218) 



Drosophila (Drosophila) raridentata Okada and Chung, i960 : 28 (S. Korea). 



Drosophila raridentata Okada and Chung ; Wakahama, Kaneko, and Tokumitsu, 1963 : 94 



(Japan) ; Wakahama, 1964 : 56 (Japan). 

 Drosophila (Dichaetophora}) raridentata Okada and Chung ; Lee, 1964 : 108. 



o*. Body about 1-2 mm. Head somewhat broader than thorax. Eyes oval, dark red, pilose. 

 Arista with about five dorsal and two ventral branches and a small fork. Palpus yellowish grey, 

 slender, with a prominent apical seta. Ocellar triangle medially black. Periorbit yellowish 

 grey, anteriorly somewhat swollen inward and one-third as long as front. Front dark grey, 

 pale along median longitudinal line, anteriorly slightly narrowing and orange-yellow, with 

 scattered frontal hairs, narrower than length down middle, posteriorly half as broad as head 

 width. Clypeus grey. Face flat, grey, parallel-sided, buccal margin straight and narrowly 

 white. Carina very small and low, yellowish grey, with a pair of small black spots apically. 

 Occiput yellowish grey. Cheeks pale yellow, darker above, about one-fifth as broad as the 

 greatest diameter of eye. Postverticals moderate in size, shorter than outer verticals. Anterior 

 reclinate orbital two-thirds as long as proclinate, one-third as long as posterior reclinate, 



