REVISION OF SPECIES OF STILOBEZZIA KIEFFER 133 



with linear interorbital space; vertex with hairs posteriorly only; 

 a small seta at the ocular bridge. Male antenna with inconspicuous 

 plume; female antenna slender, III-X each broadest just distad of 

 middle, only IX and X with preapical collar; III-X pale except 

 faint distal infuscation, XI-XV dark except XI pale at extreme 

 base; XI-XV elongate and XV without terminal seta. Palpal segment 

 III slender, tapered on distal third, no sensory pit but several elongate 

 sensilla arising from inner surface, V oval and darker in color. Thorax 

 evenly convex in front, without anterior tubercle; pleura pale, scutum 

 dark or with dark vittae; scutellum dark at sides, with 4 bristles, 

 the lateral pair small. Wing grayish to brownish hyaline, unmarked; 

 radial cells distinct; stem M about 4 times length of r-m; M 2 narrowly 

 interrupted at base; anal lobe obtuse and alula lacking fringing 

 hairs. Legs pale, slender, without prominent hairs; tarsomere V in 

 female with a strong basal swelling bearing a pair of spines instead 

 of the more typical batonnets; I— III with apical spines; female 

 claws very unequal, elongate, much shorter on posterior leg. Abdomen 

 pale basally, distal terga dark; tergal setae sparse, I with 1-3 lateral 

 setae only. Two functional spermathecae, no rudimentary; the two 

 very unequal in size, the smaller one usually globular. Genital sclero- 

 tization with shallow median cleft and 2 short blunt lobes on sternum 

 IX; internal lamellae well developed. Male genitalia short and broad; 

 tergum IX rounded; basistyle stout with prominent basidorsal 

 process, no transverse sclerotized bridge or ribbon; aedeagal sclerites 

 at base, main body more or less sickle shaped. 



Species included: Stilobezzia bata de Meillon and Hardy, British 

 Cameroons; debilipes, new species, Malaya and the Philippines; 

 distinctifasciata, new species, Thailand; flavizonata Tokunaga, New 

 Guinea; imparungulae, new species, Malaya and the Philippines; 

 sybleae Wirth, North America; tauffiiebi de Meillon, Middle Congo; 

 unifasciata Tokunaga, New Guinea. 



Key to the Oriental Species of the Sybleae Group 



1. Small, greenish-white species with dark chocolate brown thorax and abdominal 



terga; abdominal tergum II mostly dark; halter knob pale; tarsomere V 

 and claws extremely reduced on mid and hind legs of female. 



debilipes, new species 



Small to medium-size species; brownish to dark brown; halter knob infus- 



cated; abdominal tergum II broadly pale or almost totally pale; tarsomere 



V and claws well developed on all legs of female 2 



2. Smaller species; abdominal tergum II almost entirely pale; parameres some- 



what sickle shaped; basistyle with basidorsal process elongated and slender; 

 dististyle abruptly narrowed caudad to a slender, curved, pointed tip. 



distinctifasciata, new species 



