SAKCOPHAGA AND ALLIES 93 



black, the third joint brown, less than double the 

 length of the second, reaching three-fourths of the way 

 to the vibrissas; arista long, plumose for two-thirds of 

 its length; palpi brown or yellowish-brown; proboscis 

 black, normal; under side of head in profile straight 

 and square, longer than usual ; bucca almost equal to 

 half the eyeheight; back of head with two rows of 

 black hairs behind the eye, white beard rather abund- 

 ant below, outer vertical present. 



Thorax with almost silvery pollen, the usual 3-5 

 black stripes distinct from behind, brown from front ; 

 no acr except a very small prescutellar pair; 3 ps dc; 

 3 stpl; scutellum with no apicals, but with an addi- 

 tional pair of marginals between the usual two; sub- 

 apicals very small. 



Abdomen with silvery tessellation on ground 

 color changing from black at base to red at apex ; first 

 and second segments with only lateral bristles; third 

 with a median pair and laterals ; fourth almost wholly 

 red, with a row of about 20 marginals, partly double. 



Hypopygium red, first segment a little pruinose 

 on the middle, without bristles; second shining, with 

 erect hair; forceps entirely red, tipped back and 

 knobbed at apex, laterally with conspicuous, long, 

 laterally-directed hair ; behind the penis a median red 

 process; penis with black, gibbose distal portion, a 

 pair of flat, sharp processes projecting forward; pos- 

 terior clasper with a strikingly long hair on front side. 



Legs black, all the femora below and tibicC on 

 inner side villous; middle femora without comb; mid- 

 dle tibia with one long bristle below middle on outer 

 front side, and very long, dense, spreading villosity on 

 inner side; hind coxa with dense brush of short spines 

 on inner surface distally; hind femiu* tliickened and 

 much curved, villosity especially dense near base; hind 

 tibia with a few large bristles l^eliind, and dense villos- 

 ity on inner side; hind basitarsus short and flat, with 

 two projections l^elow; the following joint with one 

 similar but smaller one; middle l)asitarsus villous be- 

 low; all })idvilli enlarged. 



