206 THOMAS SAY FOUNDATION 



hairs behind the eve. Outer vertical bristles not de- 

 veloped. 



Thorax gray pollinose with the usual three of 

 five black stripes ; subniedian gray stripes divided be- 

 fore the suture; ps dc four or five, the anterior ones 

 very small; ant acr none; prsc, one pair; stpl three 

 and occasionally four; scutellum with two pairs of 

 marginals, a small pair of preapicals and a mod- 

 erately large pair of apicals. 



Abdomen gray pollinose, with well developed 

 tessellation. First and second segments with only 

 lateral bristles; third with a variable row of 8 to 14, 

 more or less interrupted; fourth with a rather dense 

 row of nearly 20, diminishing on the sides. 



First segment of hypopygium blackish or dark 

 brown, pollinose above toward the apex^ without 

 bristles, sometimes with a row of hairs on the hind 

 margin; second segment shining red, globose, with 

 numerous erect hairs; forceps dark brown, the at- 

 tached part with abundant fine black hair, the free 

 part small, mostly bare and shining, with a hump be- 

 hind it, from which it tapers with a slight forward 

 curve to the apex, which is not very sharp ; accessory 

 plate brown, thick, mostly shining, rounded; claspers 

 brown, slender, sharj) and the posterior a little 

 hooked; anterior noticeably straight toward its tip 

 without any hook at all. Penis with short brown 

 basal segment; the distal segment blackish, rapidly 

 widening, short, with a blunt point, in front of which 

 are two small shining black lobes and two shining 

 brown more divergent and longer ones; on the front 

 side apically, are two plates rather curled in, looking 

 like hooks in profile; basally from these a pair of 

 prominent, erect thin brown plates, which stand 

 nearly parallel to each other on the apical part but 

 spread out flat basally. Fifth sternite shining yellow 

 on the basal united part, the V-shaped excision filled 

 in broadly at the base with a membrane ; beyond this 

 the sides diverge into two high, rounded, smooth black 

 lobes, bearing spines not brush-like on the inner side. 



