16 U.S. NATIONAL MUSEUM BULLETIN 2 83 



Thorax bluntly rounded in front, without anteromedian tubercle or 

 projection. Wing unmarked; surface without macrotrichia; anal lobe 

 never obtuse; radius with only 1 seta, near basal arculus; marginal 

 fringe complete, alula never bare; microtrichia may be weak or strong, 

 in latter case adding to wing shading; IRC obliterated and vein Ri 

 arising at or past r-m; stem M long. Halter at least partly infuscated. 

 Legs usually with weak hairs, except for femur with 2-4 short stout 

 spines midventrally (Africana Group) or stout anteroventral spines 

 at base of fore femur, on hind trochanter, and at proximal third of 

 hind femur (males only of Brevicostalis Group). Tarsomere V with 

 or without batonnets; female claws long, very unequal; male claws 

 large and unequal (Africana Group) or small and equal with cleft tips 

 (Brevicostalis Group). 



Abdomen with weak hairs on terga; variable dark color pattern 

 on II to VI. Spermathecae 2 functional, well sclerotized with short 

 slender necks; a third rudimentary spermatheca present. Male geni- 

 talia with very narrow sternum IX, caudomedian excavation very 

 broad and shallow with ventral membrane feebly spiculate; tergum 

 IX short and caudally rounded, with pair of setose submedian lobes; 

 basistyles short and stout, with mediangular processes connected by 

 a transverse sclerotized band or bridge, basidorsal process not devel- 

 oped; dististyle stout, tapered to a point or with tip abruptly nar- 

 rowed to a point; aedeagal sclerites narrow rods or faint liplike 

 sclerotizations; parameres usually elongate. 



Distribution. — Fourteen known species from the Nearctic, Ethi- 

 opian, Neotropical, and Oriental regions. 



Key to the Oriental Species of the Subgenus Eukraiohelea 



1. Small to medium-size species; wing with costa ending well beyond middle and 

 with closely set setae, surface microtrichia strong; fore femur with 2-4 

 short, stout spines midventrally, hind tibia with 2-5 distal bristles on 

 extensor side shortened and thickened; male trochanters without any stout 

 spines; male claws as in female, one large and one small on each leg; sperma- 

 thecal surface without any hyaline perforations; male genitalia with aedeagal 

 sclerites a pair of caudally converging, slender rods with prominent dorsal 

 median lobes; parameres with main body long and linear, well sclerotized, 

 often with spiculose tips; short sclerotized part of bridge between basis ty lie 

 mediangular processes appressed to parameres in their midpoint (Africana 



Group) 2 



Small species; wing with costa ending little beyond middle and with widely 

 spaced setae, surface microtrichia weak; femora without any stout spines 

 in female, male fore and hind femora, as well as hind trochanters, bearing 

 a stout black spine; male claws equal, with bifid tips; sperma thecal surface 

 with hyaline perforations; male genitalia with aedeagal sclerites inconspic- 

 uous and appearing as feebly sclerotized tips to the genital pore; parameres 

 with main body stout, slightly arcuate, and held in midportion by a promi- 



