1917] Van Duzee—New Diaphorus from the Western States 39 
each femora with a few small bristle-like hairs at tip on the lower 
posterior edge; middle tibiz with only one bristle which is large, 
stout, black and inserted on the anterior side near the base; hind 
tibize with several bristles above, three or four of which are larger 
than the rest, the one near the base is the largest; feet slender, the 
fore tarsi longer than their tibiz, middle tarsi about equal to their 
tibize in length, and hind tarsi shorter than their tibize. Tegulee 
and knob of halteres pale yellow, stem of halteres brownish; cilia 
of the tegulze yellow, yet appearing nearly black in certain lights. 
Wings grayish hyaline, tinged with yellowish brown in front of the 
third vein; first vein reaching about half the way to the tip of sec- 
ond vein; fourth vein ending in the apex of the wing; costa rather 
stout, black; veins brownish, yellow at the root of the wings. 
Female: Agrees with the male except in sexual characters and 
that the face is wider and not silvery but rather thickly covered 
with white pollen and the third antennal joint is smaller. 
Described from one male and two females taken at Bill William’s 
Fork, Ariz., Aug. and Sept., by F. H. Snow. 
Type in the Kansas University collection. 
This species agrees with D. variabilis V. D. in most characters 
but differs in having no small bristle on the top of the middle 
tibize, there being no bristles on them except the large one near 
the base in front, in variabilis this small bristle is distinct as well 
as the preapical one on the outer side of the hind femora which is 
also lacking in this species; the body and legs are more slender and 
the wings and wing-veins more yellowish than in variabilis. Al- 
though these two species resemble each other so much yet I feel 
sure they are distinct. 
