SARCOPHAGA AND AIXIES 83 



lum with 3 pairs of marginals, one pair a little be- 

 hind the center of the disk; apical hardly more than 

 hairs. Abdomen whitish pollinose, tessellated, with 

 three changeable indistinct stripes; first and second 

 segments each with lateral bristles; the third with a 

 single marginal pair and one lateral; fourth with a 

 marginal row of about ten. 



Hypopygium : First segment with a pronounced 

 hump beyond the middle ; red except before the hump, 

 where the black color extends down the side only 

 about half way; hind edge with an interrupted row of 

 about 8 smallish bristles; second segment red, rather 

 short, subshining; forceps reddish yellow, of compli- 

 cated shape; on the posterior side, just at the begin- 

 ning of the free part, is a long curved and twisted 

 process suggesting to the writer the horns of a bull, 

 from which tlie name is derived. The remainder of 

 the free part is rather straight with a black point ; the 

 attached part bears a sharp median keel, at the base 

 of which; just below the anus, there is a striking tuft 

 of long black hairs directed straight backward; acces- 

 sory plate yellow, long, widened near the tip, bearing 

 on the outer front side a dense row of stiff black hairs ; 

 posterior claspers yellow, small, with a sharp rather 

 twisted point; anterior claspers yellow, very low and 

 blunt; penis with very short and obscure basal seg- 

 ment, distal one narrow, for some distance, becoming 

 black toward the end, bearing a large pair of complex, 

 diverging and somewhat fleshy processes on the front 

 side, and apically a black rounded median somewhat 

 hooded structure which has a considerable angle pos- 

 teriorly; fifth sternite reddish and rather broad at 

 base, with a wide excision, beyond which the sides nar- 

 row together again in black curved points })earing 

 ])rushes. At the base of the point of each side there 

 is a small, sharp, black peg-like process. 



Legs black; all femora short, stout and covered 

 with a grayish dust; middle femur without comb; mid- 

 dle tibia on outer front side with a single bristle be- 

 low the middle; hind femur without any bristles in the 



