REVISION OF SPECIES OF STILOBEZZIA KIEFFER 



117 



Figure 86. — Stilobezzia isthmostheca, new species (9 ). a, frontovertex; b, femora-tibiae 

 of mid and hind legs; c, last 2 tarsomeres and claws; d, wing; e, spermathecae;/, abdomi- 

 nal terga I-IV. 



Wing (fig. 86<i): Pale, unmarked; CR 0.65; r-m to stem M lengths 

 as 7:25. Halter brown. 



Abdomen (fig. 86/): Brownish; II-VI dark brown, I and extreme 

 caudal terga pale; setae sparse and scattered, absent from antero- 

 lateral corners of II-IV. Spermathecae (fig. 86e) 2 functional and 1 

 vestigial; the large functional oval with long, extremely slender neck, 

 moderately sclerotized, measuring 0.112 mm by 0.084 mm without 

 the neck; the smaller with neck lacking, short-oval, measuring 0.030 

 mm by 0.019 mm. Genital sclerotization not visible in available prep- 

 aration. 



Male. — Unknown. 



Distribution. — Thailand. 



Types. — Holotype female, Udonthani Prov., Pen Dist., Thailand, 

 23-24 June 1959, Manop R., light trap (USNM 69479). Paratypes, 

 2 females, THAILAND: Loei, Thai Li, 8-9 June 1959, Manop R., 

 light trap, 1 female. Nong Kai, Meung Dist., 10-14 June 1959, Manop 

 R., light trap, 1 female. 



Discussion. — This species is not closely related to any other 

 Oriental members of the Subviridis Group but comes closest to tene- 

 brosa Macfie from the Marquesas Island and bizonata Tokunaga from 

 New Guinea, from which it can be distinguished by the long scler- 

 otized neck on the large spermatheca. In coloration it greatly resembles 

 eximitarsis, new species, from Malaya, which, however, is a typical 

 member of the Subviridis Group structurally. 



