SARCOPHAGA AND ALLIES 281 



poorly developed; fourth with a marginal row of 

 about 20; fifth sternite yellow, conspicuous, broadly 

 V-shaped, the tips of the divergent arms bearing 

 minute blackish bristles. 



Hypopygium yellow; first segment yellow polii- 

 nose, with a conspicuous hump near the base and a 

 row of black bristles at the hind margin; second seg- 

 ment with yellow pollen and erect black hairs, two of 

 which are bristlelike; forceps reddish except the ex- 

 treme tip and outer margin ; viewed from behind they 

 are not at all divergent but seem to form almost a 

 single organ coming to a sharp tip, rather crenulate 

 on the edge; in side view they are approximately 

 straight but the crenulation is still distinct; the ex- 

 treme tip is hooked slightly forward; accessory plate 

 rather broadly rounded, yellow, the edge next the for- 

 ceps thin and semitransparent, a little expanded; 

 posterior clasper yellow, bordered with black, erect, 

 with a semicircular excision under the tip; anterior 

 clasper very stout, the apical half black, the tip 

 straight and sharp, cut away obliquely beneath to a 

 second point, from which the outline curves sharply 

 to the base ; viewed from behind there is a prominent 

 hump or ridge at about the middle of the outer side. 

 Penis large and complicated, its basal joint short and 

 not distinguishable, the distal segment yellow basally, 

 mostly brown toward the apex. The back plate is 

 deeply split into two divergent lobes apically; be- 

 tween these a keel arises from which, toward the tip, 

 a pale membrane spreads out each way, its attach- 

 ment extending forward upon the protuberant front 

 part. The extreme apex is in the form of a round 

 rim encircling a deep hole; on the front side of the 

 segment near its base there is a concave transverse 

 plate, seemingly undivided, of which the lateral edge 

 is prolonged each way into a point curving backward 

 and apically. 



Legs black ; middle femur with short comb ; mid- 

 dle tibia with one bristle on outer front side; hind 

 tibia not villous. 



