104 U.S. NATIONAL MUSEUM BULLETIN 283 



at wing margin in cell R5, and 4 linear, fainter than the other 3, along 

 veins M i; M 2 , M 3+4 , and Cui at apices; all veins yellow except the 

 portions covered by the dark spots. CR 0.76; IRC highly atrophied, 

 appearing either as a nodule with a median dark mark standing for 

 the cell space, or, often, with a very small lumen, but never indicating 

 total fusion of veins in this area; r-m vertical; Ri distinctly oblique; 

 r-m to stem M lengths as 10:9; stem M thus very short; macro trichia 

 absent; 2-4 setae along proximal portion of radius; alula fringed. 

 Halter (fig. 80<7) with pale stem, knob dark brown except linear pale 

 extension from stem arching across distal third of knob. 



Abdomen: Elongate, relatively flattened above, not bent ventrally; 

 without distinct color pattern, pruinose brownish, variable with base 

 paler, pale longitudinal line down the middle to entirely pale, or 

 with narrow apical crossbands on terga; setation (fig. 80/) weak, I 

 with cluster of 20-25 hairs on each side; posterior terga with scattered 

 setae, denser laterally. Spermathecae (fig. 80/) ovoid, highly sclero- 

 tized except neck portion weaker, surface smooth; slightly unequal, 

 measuring 0.067 mm by 0.052 mm and 0.056 mm by 0.038 mm. 

 Genital sclerotization (fig. 80m) with lobes of sternum IX elongate, 

 pointed, the emargination filled with a median pair of small detached 

 pubescent plates; internal lamellae lightly sclerotized. 



Male.— Length of wing 1.63 (1.52-1.78, n=15) mm. 



Similar to the female with the usual sexual differences; antennal 

 plume dark brown throughout; tarsomeres IV and V without spines 

 or batonnets; I— III with strong ventral spines as: fore leg 1— (2— 3)— 1, 

 0-0-1, 0-0-1; mid leg 1-2-2, 0-0-2, 0-0-2; hind leg 1-0-1, 0-0-1, 

 0-0-1; wing infuscation at tip of vein Cui stronger than in female. 

 Genitalia (fig. 80i-k) without caudomedian excavation on sternum 

 IX, the ventral membrane spiculate; tergum IX elongate and rounded 

 caudad with faint caudomedian cleft; basistyle elongate without 

 mesal expansion at base, mediangular process not developed; dis- 

 tistyle long and slender, slightly bent toward base, tip slightly pointed; 

 aedeagal sclerites nearly straight, slender, with bilobed caudomesal 

 tips meeting on midline; parameres each with slender lateral arm at 

 base, main body long, moderately slender, nearly straight, with 

 slender tip slightly flexed ventrad. 



Distribution. — India and Ceylon east and north to Japan, Java, 

 and Micronesia (Guam and Palau). 



Material examined. — 233 specimens. 



GUAM: Agana (Usinger), holotype of inusitata (Johannsen). 

 INDONESIA: Djakarta, Java (Rees). 

 JAPAN: Kyoto, Midoro Pond (Arnaud). 

 LAOS: Vientiane (Quate). 



MALAYA: Negri Sembilan, Tampin (Colless, Wharton); Negri Sembilan, 

 Telok Pelandok, Pt. Dickson (Traub); Pahang, Kuala Singgora (Wharton); 



