338 
CHARLES T. BRUES 
the length of the wing, clothed with very short, fine and recumbent 
bristles ; first vein ending almost twice as far from the humeral cross¬ 
vein as from the tip of the third, distinctly thicker after it turns obli¬ 
quely upward to the costa ; third vein stout, thicker than the costa, 
but not in the least swollen apically ; with a series of minute bristly 
hairs along its entire length. Fourth vein evenly and not strongly 
curved at the base, then straight to the tip ; fifth slightly curved ending 
as far from the wing-tip as the fourth ; sixth bisinuate ; seventh very 
weak, close to the edge of the wing. Halteres piceous or black. 
Male. This sex differs by its uniformly smaller size (1 mm. or 
even less) and greater variability. The abdomen is entirely black, and 
highly polished beyond the fourth segment. The hypopygium is glo¬ 
bose, subshining, without any projecting lamella and the posterior 
margin of the fifth segment bears a series of about eight long bristly 
hairs. The legs are lighter, more nearly fulvous and the number of 
bristles along the hind tibia varies from 3 to 5. In the wing the costa 
is shorter, falling considerably short of the middle of the wing. 
Described from 30 females and 7 males received as described in 
the opening paragraph of the present paper. 
The amount of fulvous color on the abdomen of the female is 
subject to some variation ; frequently there are black blotches toward 
the sides of the third segment and sometimes the lateral edge of all 
the segments is blackened. The armature of the hind tibia varies in 
the male as noted above, and also, but much more rarely so in the 
female. 
This is a very distinct species both in color and structural cha¬ 
racters and can be confused with no described species. 
