SARCOPHAGA AND ALIJES 185 



Abdomen with the usual changeable tesselation, 

 rather silvery, with very indistinct longitudinal 

 stripes; first and second segments with only lateral 

 bristles; third with median marginal pair (sometimes 

 weak or wanting) and two laterals, the fourth with a 

 decreasing row of about 18. 



Hypopygium reddish yellow; first segment 

 large, swollen, slightly pollinose, in the middle with 

 a row of six stout bristles behind ; second segment 

 shining, globose, with abundant erect hairs, no bris- 

 tles ; f orcej)s of very peculiar shape, the attached part 

 joined together on the median line to form a sharp, 

 almost keel-like protuberance. Below this is a deep 

 transverse bare and shining concavity, divided in the 

 median line. Viewed from behind each of the forceps 

 bears a transverse ridge below this concavity, follow- 

 ing which it is again concave ; beyond the second con- 

 cavity there is a small ]:)rotuberance, on the inner edge, 

 directed mostly backward, and a long arm or protub- 

 erance on the outer side, beyond which it runs to a 

 slender sharp blackish point. In profile both of these 

 concavities are very distinct. Accessory plate yellow, 

 slender, bent in the middle almost at right angles; 

 Dosterior clasper yellow, slender, erect, not distinctly 

 hooked at tip; anterior clasper much stouter, strong- 

 ly bent forward, with two points at the apex, the api- 

 cal portion black and shining. Penis with very short 

 basal segment, the distal one bearing a conspicuous 

 sharp median keel from its base, which forms the 

 back edge and tip of the organ. In front about the 

 middle is a broad expansion bearing lateral blades 

 and a basal transverse plate. Most of the parts are 

 more yellow than black ; fifth sternite quite complex ; 

 close to the base of the incision there is a roundish 

 brush of short spines with a few long bristles ; behind 

 this a sharp rim diverges laterally and bears a row of 

 stiff spines. The lateral end projects in tlie form of 

 a yellow lobe from under the fourth tergite. 



Legs ye]loM% coxae partially black; front femur 

 witli a more or less dark streak on the outside; all 



