226 THOMAS SAY FOUNDATION 



from hairs; prsc 1; scutellum with 2 marginals, 1 

 smaUish subapical, 1 smalhsh apical. 



Abdomen densely gray-poUinose, tessellated, 

 with three blackish stripes, the outer shifting; first 

 three segments with only lateral bristles; fourth with 

 a marginal row of 16 or more; its hind ed^e g-enerally 

 a little red; fifth sternite black, with sharp, protub- 

 erant base and dense brushes beyond the fork, which 

 shade off long-er on inner edge. 



Hypopygium red, subshining, first segment of 

 good size, with a row of bristles behind; second large, 

 globose, not bristly ; forceps long, black except basal- 

 ly, tapering, rather straight and divergent, near tip 

 turned rather strongly forward, ending in a sharp 

 point ; accessory plate yellow, triangular witli the cor- 

 ners rounded ; the side next the forceps concave ; pos- 

 terior clasper black, stout at base and with a stout hair 

 arising on the front side there, the tip sharp and bent 

 forward ; anterior clasper yellow, long and low, nearly 

 straight apically; penis with yellow basal segment, 

 the distal one blackish, wide and compact ; on its hind 

 side near the tip arise a pair of yellowish processes 

 which extend over the end and diverge from each 

 other; out of the middle of the segment arise sub- 

 apically two very black, large lobes; the back plate 

 embraces these and gives off at the extreme lateral 

 angle a sharp black point. 



Legs black; middle femur with comb on hind 

 side below near tip; middle tibia hairy but not vil- 

 lous, and with two bristles on outer front side; hind 

 tibiae with very long and rather dense villosity, spread- 

 ing both ways. 



Wing hyaline; no costal spine; third costal seg- 

 ment longer than fifth and sixth together; first vein 

 bare, third a little hairy near base. 



Female. Color light gray, densely pollinose. 

 Front .391 of head (average of five,— .376, .382, .385, 

 .388, .432) ; with the usual two orbitals and outer ver- 

 ticals; frontal stripe not distinct above; stpl regu- 

 larly four, occasionally one is small; no apicals on 



