80 THOMAS SAY FOUNDATION 



intermediate of these small ; siibapical and apical pairs 

 of scutellum very thin and small. First and second 

 abdominal segments with only lateral bristles; third 

 with an irregnlar row; fourth with a row of about 18, 

 its hind margin sometimes red. 



Hypopygium red, the first segment, however, 

 sometimes dark basally; it is pollinose in the middle 

 region, convex in profile near base, with a row of bris- 

 tles on hind margin; second segment red, subshining, 

 globose, without bristles; forceps short and wide, 

 ])asal half or more with tuft of very striking long, 

 ])lack hair; accessory lobe finger-like, blunt; penis 

 complex and rather soft, so that it is shriveled in pre- 

 served specimens and difficult to describe or figure 

 in detail; anterior clasper with a small tooth at apex; 

 fifth sternite near the base of the V with two pad-like 

 structures facing backward. 



Hind femora with two entire rows of bristles on 

 outer side above the middle; the lower of these is in 

 some cases a little irregular, but bears the longest 

 bristles near the apex ; a third, lower, row is only part- 

 ly developed distally. 



Female. As the characters separating latisterna 

 and cimhicis, thougli ample, are confined to the male 

 sex, the following notes on the female will apply to 

 both species, which at present do not appear to be 

 separable in the female sex. 



The numerous specimens examined agree in hav- 

 ing no prescutellar bristles, well developed ant acr, 3 

 ps dc, an uncommonly long arista, changeable reflect- 

 ing spots alongside the base of antennae, anterior cross- 

 A ein bordered with brown, and apical cell rather wide- 

 ly open. The abdomen is black, with the hind edge of 

 the fourth segment sometimes a little red, })ristles of 

 abdomen as in male; genital segment red (dull or- 

 ange of Parker), genital opening nearly circular, 

 fringed with hairs, with a distinct flat, red sternite be- 

 low. 



Length of male, 8-12 mm.; of female, 6-10 mm. 



