152 THOMAS SAY FOUNDATION 



suture; back of head with two rows of black hah's, 

 running out at the lower edge of the orbit; palpi and 

 proboscis black, ordinary. 



Thorax thinly gray pollinose, with the usual 

 three to five stripes, which are brown when viewed 

 from in front; ps dc 3; ant acr present but small; 

 prsc small; stpl 3, large; scutellum with 3 pairs of 

 marginals, the intermediate small; one pair smallish 

 subapicals. The scutellum bears numerous pale hairs 

 along and underneath its border at each side. 



Abdomen gray pollinose, tessellated, with a 

 shining median black line; fourth segment more than 

 half bright red ; first and second segments with only 

 lateral bristles; third with stout, erect median mar- 

 ginal pair; fourth with marginal row of about a doz- 

 en, of which several near the middle are very stout; 

 fifth sternite red, deeply excised, sides not very 

 strongly divergent and bearing only small hairs. 



Hypopygium red; first segment considerably 

 retracted, apparently without bristles; second seg- 

 ment globose, shining, without bristles; forceps shin- 

 ing black, the attached part short, the free part un- 

 usually long and slender, straight for two-thirds of 

 its length, then gradually bent forward, tapering to 

 a sharp point. Viewed from behind, the forceps di- 

 verge very little. Accessory plate small, triangular, 

 blackish; posterior clasper erect, nearly straight, 

 blackish, moderately curved forward at tip; anterior 

 clasper sliorter and more strongly curved, shining 

 black, the tip thin and straight; penis with short, 

 small brown basal segment, the distal segment elon- 

 gated and swollen, suggesting a flask; the back part 

 of it is shining brown, the sides and front are mostly 

 white and semi-transparent. It bears no perceptible 

 appendages except at the front edge at tip, where 

 there are three processes in a row, the lateral pair 

 curving outward, the median one slightly bent for- 

 ward. 



