86 T. OKADA 



long apical and two ventral black setae. Ocellar triangle small, glossy brown. Periorbit glossy 

 grey-brown, broad, posteriorly pale, anteriorly rounded, three-fourths as long as front. Front 

 matt orange-brown, broad, nearly parallel-sided, anteriorly one and a half times as broad as 

 length down middle, posteriorly three-fifths as broad as head width. Face greyish yellow, con- 

 cave, whitish along eye margin. Carina high, short, half as long as face. Clypeus grey-brown. 

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

 Occiput yellowish brown, ventromedially orange. Postverticals moderate in size. Anterior 

 reclinate orbital very fine, outside proclinate, twice as distant from proclinate as from posterior 

 reclinate, which is one and a half times as long as proclinate. Vibrissae long, second oral one- 

 third as long as vibrissa. 



Mesonotum glossy yellowish brown, strongly convex. Scutellum glossy yellowish brown. 

 Thoracic pleura paler. Two humerals, upper much shorter, two-fifths as long as lower. Acro- 

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

 anterior and posterior dorsocentrals about half distance between anterior pair. Anterior 

 scutellars divergent, slightly longer than posteriors ; posteriors nearer to each other than to 

 anteriors. Sterno-index about 0-5 ; median sternopleural as long as anteriors. Legs fuscous 

 yellow ; femora paler above. All metatarsi as long as other segments together. Preapicals on 

 all legs ; apicals on fore and mid legs. Wings relatively large, tip slightly pointed, somewhat 

 fuscous along costa ; crossveins clouded. i? 2 +3 medially gently convex anteriorly, apically 

 strongly curved to costa ; i? 4 + 5 and M parallel. C-index about 2-4 ; 4V-index about 1-5 ; 

 4C-index about 10 ; 5x-index about 1-7 ; Ac-index about 30. Ci-bristles two ; C3-fringe on 

 basal three-eighths. Halteres dark yellowish brown. Abdominal tergites glossy yellowish brown 

 with sharply demarcated caudal black bands, which medially jut out triangularly in front. 

 The triangular patches increasingly larger on the more caudal tergites ; iT yellowish brown ; 

 6T mostly black. 



Periphallic organs yellowish brown. Genital arch large, distally wider, setigerous and pubes- 

 cent, ventrally curved posteriorly, subapically with deep incision on caudal margin, with a low 

 triangular process above insertion of clasper. Clasper small, triangular, distal margin broad and 

 straight, with a row of about ten long black teeth, occupying nearly entire distal margin. Anal 

 plate relatively small, pubescent and setigerous, fusiform. Phallic organs : Aedeagus short, 

 thickly hairy. Apodeme straight, twice as long as aedeagus. PI = 0-4. Anterior paramere 

 small, conical, medially with a few sensilla. Posterior parameres fused to from a large fan- 

 shaped marginally finely serrated yellowish orange lobe. Hypandrial plate large, conically 

 projected posteriorly. Ventral fragma triangular, p.f. = ABCdefgHiKLMN. Egg-guide 

 lobe brownish black, proximally tapering, distal margin broadly truncate, with about twelve 

 marginal and two discal large brown teeth. Subterminal hair prominent. Basal isthmus black, 

 about one-fifth as long as lobe. 



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

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



Allotype $. Taplejung District, Sangu, mixed vegetation by stream in gully, 

 c. 6,200', xi. 1961-1.1962 {R.L.C.), BMNH. 



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

 Sangu and Tamrang, mixed shrubs in deep gorge, c. 5,200', x-xi.1961 ; 2^, between 

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

 i-ii.1962 (R.L.C.), BMNH, and the Tokyo Metropolitan University (1 $ from between 

 Sangu and Tamrang). 



Closely resembles D. fruhstorferi Duda, 1924 (India), especially in having broad 

 front, only one long oral, clouded crossveins, and medially triangularly projected 

 black caudal bands of abdominal tergites, but differs from it in having three ventral 

 branches of arista (only one in fruhstorferi) . 



