24 T. OKADA 



broad as length down middle, posteriorly about two-sevenths as broad as the head width. Face 

 greyish white, flat, laterally concave. Carina undeveloped. Cheeks white, very narrow, about 

 one-twentieth as broad as the greatest diameter of eye. Occiput brownish black. Anterior 

 reclinate orbital thrice as distant from posterior reclinate as from proclinate. Postverticals 

 slender. Inner vertical much shorter than outer vertical. Vibrissae long, succeeding orals about 

 one-third as long as vibrissa. 



Mesonotum dark orange-brown, silver pollinose, mediocaudally and laterally more fuscous. 

 Scutellum dark brown, grey pollinose. Thoracic pleura pale yellow, orange below, with an 

 anteriorly narrowing dark brownish black median longitudinal stripe. Humerals two, upper 

 longer. Prescutellar as long as anterior dorsocentral. Anterior dorsocentrals about half length 

 of posteriors ; distance between anterior and posterior dorsocentrals about two-thirds distance 

 between anterior pair. Anterior scutellars divergent, slightly longer than posteriors, which are 

 nearer to each other than to anteriors. Sterno-index about o-q. Legs yellow ; knees of hind 

 leg somewhat fuscous ; last tarsal segment brownish. Front and mid metatarsi slightly longer 

 than the other segments together, hind metatarsi as long as the other segments together. Pre- 

 apicals on mid and hind legs ; apicals prominent on mid leg. Wings hyaline, crossveins clear. 

 J? 2 +3 nearly straight, gently curved to costa apically ; i? 2 + 3 and M nearly parallel. C-index 

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

 2-5. Ci-bristles two ; C3-fringe on basal two-thirds. Halteres yellow, tip glossy black. 

 Abdominal tergites black, matt ; iT yellow ; 2T medioanteriorly yellow, caudal margin 

 narrowly white ; 3T very short, white, without setae. Cerci black. 



Periphallic organs : Genital arch black, pubescent, broad ; heel low, triangularly pointed, 

 with a few stout long setae ; toe nearly rectangular ; caudal margin with several long setae. 

 Anal plate rather small, fusiform, setigerous, pubescent, ventral tip pointed. Clasper oval, 

 pubescent and setigerous, proximally somewhat narrowing, distally rounded. Decasternum 

 a narrow transverse bar. Phallic organs : Aedeagus black, flat, oblong ; ventral recurved 

 process pale yellow, rod-shaped, parallel-sided, twice as long as aedeagus. Anterior paramere 

 oblong, pale, with a row of several sensilla on nearly entire length. Ventral fragma appearing 

 pointed proximally, laterally pale, fusiformly dilated. PI = 00. p.f. = ABCDeFgHikLmN. 



Holotype <$. East Nepal : Aran Valley, west shore of River Aran, below 

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

 (R.L.C.), BMNH. 



Closely resembles L. leucozona Duda in having very narrow white 3T in $, halteres 

 with black knob, striped thoracic pleura, and yellowish orange palpus, but differs 

 from it in having unicolorously dark brownish black scutellum, 2T only yellow 

 anteriorly and cercus black. 



Leucophenga argentata (de Meijere) 

 (Text-figs. 49-52, 73) 



Drosopkila argentata de Meijere : 258 (Java). 



Leucophenga argentata (de Meijere) Duda, 1924a : 188 ; 1924b : 238 (Java, Formosa) ; Sturte- 

 vant, 1927 : 364 (Philippine) ; Wheeler and Takada, 1964 : 226 (Palau). 



£, ?. Body about 2-5 mm. Head slightly broader than thorax. Eyes reddish brown, large, 

 bare. Antennae milky white ; third segment twice as long as broad, tip somewhat angular 

 anteroventrally. Arista with about seven dorsal and three ventral branches and a small 

 terminal fork. Palpus pale brown, darker in female, small, apically fuscous, ventrally with a 

 few long black setae. Ocellar triangle black, grey pollinose. Periorbit milky white, obscurely 

 demarcated from front. Front milky white, flat, parallel-sided, anterior width four-sevenths as 



