254 THOMAS SAY FOUNDATION 



Thorax gray pollinose, with the usual three to 

 five stripes not very distinct ; ps dc four, rather large ; 

 ant acr very large ; prsc one large ; stpl three ; scutel- 

 lum with two or three marginals ; one pair preapicals ; 

 no apicals. 



Abdomen gray pollinose, tessellated, with a 

 median dark stripe; first and second segments with 

 only lateral bristles ; third with a pair of median mar- 

 ginals and sometimes a feeble row ; fourth with a mar- 

 ginal row of about ten; fifth sternite not very widely 

 divergent, its edges elevated and covered with a dense 

 short brush, very conspicuous; it is but little devel- 

 oped laterally from these brushes. 



Hypopygium rather large; first segment polli- 

 nose, mostly black in ground color, but sometimes 

 considerably reddish on the sides, with an interrupted 

 row of bristles behind; second segment globose, sub- 

 shining, with a few erect scattered small bristles; 

 forceps red, the tips black, widely divergent near the 

 base and slightly converging at the tips; in profile 

 sharp and rather strongly curved forward apically; 

 accessory plate small, yellow, depressed; posterior 

 claspers blackish, erect, very strongly hooked at tip, 

 before which on the front side is an excision and two 

 or three minute teeth ; anterior claspers reddish brown, 

 rather wide at base but rapidly becoming narrow, 

 the tips slender, bent forward but not decidedly 

 hooked; penis blackish, one- jointed, slender and sim- 

 ple nearly to the tip, where it is suddenly enlarged, 

 polished and shining, ending in two rounded knobs 

 separated by a deep groove. In the middle on the 

 front side there is attached to a widened part a trans- 

 verse erect plate, deeply notched at the apex, brown 

 with pale margin ; on each side of this, somewhat diag- 

 onally placed, is a partially collapsed process or plate 

 which behind runs out in a point almost to the termi- 

 nal knobs and in front ends in a wrinkled and rounded 

 lobe. 



