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U.S. NATIONAL MUSEUM BULLETIN 283 



Figure 82. — Stilobezzia punctivenosa, new species, forms 2-4 (a-b, 9 ; c—k, d"). a, thorax, 

 form 2; b, wing, form 2; c, palpal segment V, form 3; d, wing, form 3; e-f, o" genitalia, 

 form 3; g, palpal segment V, form 4; h, wing, form 4; i-&, cf genitalia, form 4. 



Types. — Holotype male, allotype female, Bangkok Prov., Thonglo 

 Dist., Thailand, Aug.-Sept. 1962, J. Scanlon, light trap (USNM 69477). 

 Paratypes, 12 males, 8 females, same data as types. 



Discussion.- — -Because of extensive variation in our abundant ma- 

 terial (including 58 males and 28 females mounted on slides) , we have 

 restricted the type series to the specimens characterized above. Our 

 other material can be only partially correlated by using characters of 

 wing pattern and venation, extent of the pale tip of palpal segment V, 

 and the shapes of the male aedeagal sclerites. We have arranged this 

 material in 7 divisions, which can be characterized with partial success 

 by using the following key (see also measurements in table 2) : 



1. Vein Cui completely dark, not showing evidence of isolated spots (2 females 



from Thailand — Udonthani and Loei Provinces) (fig. 82a-b) . . Form 2 

 Vein Cui bearing 2 dark spots, pale in midportion 2 



2. Subapical dark spot in cell R 5 with distal margin not emarginate; palpal seg- 



ment V vaguely pale at tip 3 



