SARCOPHAGA AND ALLIES 51 



and two laterals; fourth with a marginal row which 

 extends down the sides in full strength and numbers 

 about 24 bristles. 



Hypopygium as partly described; first segment 

 black, second red. Forceps straight, hardly at all di- 

 vergent, blackish, behind with dense hair slanting 

 back and outward; at the tip a very minute tooth. 

 Accessory plates large, broad, anterior edge shining 

 black. Posterior clasper long, stout, and strongly 

 curved; anterior clasper surprisingly modified, — it is 

 reversed in position so that it closes backward, and 

 greatly elongated, lying inside the margin of the cav- 

 ity so as to be almost invisible even basally ; the great- 

 ly elongated and enlarged tip is so far forward that 

 it cannot be seen in ordinary spread specimens, but 

 the hypopygium must be taken apart to reveal it; 

 it is as large as the forceps of most species. A row 

 of reddish hairs along its more slender basal part are 

 plainly visible anterior to the hind clasper. Penis 

 ^vith a long, swollen, bright red basal segment, nar- 

 rowing to a neck where it joins the distal one, the 

 junction close and not hinged; distal segment with a 

 rather small central mass, dorsally dividing just be- 

 yond this into two long thin plates, which diverging 

 slightly curve over the end and partly conceal the 

 inner parts; these are several incurved processes, 

 basad of which is a flat transverse plate with three 

 lobes; caudad of this a brown thin margin expanded 

 from the side of the segment. 



Legs black; middle femora without comb; mid- 

 dle tibia with two bristles on outer front side; hind 

 tibia without villosity. 



Wings subhyaline; costal spine large; third cos- 

 tal segment much shorter tlian fifth; the distance of 

 the tip of tlie fourth vein from the extreme apex is 

 about two-thirds the fifth costal seg-ment. 



Female. Front .312 of head; palpi slightly cla- 

 vate; genital segment deep red, conspicuous, not re- 

 tracted, with a fringe of stout bristles; below it has 



