S^VRCOPHAGA AND ALLIES 291 



blackish, the third joint 2^/0 times the second, reach- 

 ing three-fourths of the way to the vibrissie, which are 

 at the oral margin; arista plumose for about two- 

 thirds its length ; palpi and proboscis black, ordinary ; 

 bucca one-third the eyeheight, pollinose with a yellow- 

 ish tinge in front, covered with mostly pale hairs; 

 back of head with two rows of black hairs behind the 

 eye, both of which run out before they reacli the 

 lower edge of the eye; the rest of the area covered 

 with pale hairs, which are conspicuous below. 



Thorax yellowish gray pollinose, with 3 to 

 5 black stripes ; ps dc four, of which the foremost two 

 are small and one of them hardly larger than a hair; 

 ant acr none ; prsc small or almost absent ; stpl three ; 

 scutellum with two large marginals, one smallish sub- 

 apical and no apicals. 



Abdomen very large behind and truncate on 

 account of the peculiar shape of hypopygium, tessel- 

 lated, with yellowish gray pollen, no distinct median 

 stripe; fourth segment and sides of the others rather 

 reddish in ground color; first and second segments 

 with only lateral bristles ; third with median marginal 

 pair ; fourth with a marginal row^ of which only about 

 8 are large, the others diminishing below; fifth ster- 

 nite rather large, reddish brown, the median part 

 shining, hardly at all divided, with only a slight notch 

 at the tip, on each side of which is a little swelling. 



Hypopygium reddish brown, pollinose, first seg- 

 ment large, reddish in color and pollinose and flat be- 

 hind, with a row of delicate bristles along the hind 

 edge ; second segment smaller, pollinose, a little black- 

 ish on the sides; forceps very minute, entirely red- 

 dish-yellow; viewed from behind they are moderately 

 separated but not distinctly divergent; in profile they 

 bend strongly backward and have a small hook for- 

 ward at the tip; accessory plate very minute, trian- 

 gular; there is a prolongation of the wall of the sec- 

 ond segment of the hypopygium which nearly occu- 

 pies the usual position of the accessory plate, but the 

 plate itself is just at the tip of this structure; both 



