1925] New Species of North American Dolichopodidce 
183 
fore coxa, but without a black bristle. Abdomen blue-green 
with abundant brown pollen on the sides; the hairs on its dorsum 
short, black, on the sides the hairs are longer and white. Hy- 
popygium mostly concealed; its appendages black, they consist 
of a minute pair of lamellae fringed with hairs and a central organ 
extending from the base of the hypopygium, all these projecting 
backward. 
Coxae with brownish gray pollen; anterior pair with rather 
long, delicate, white hairs, without black bristles; femora and 
tibiae green. Fore femora considerably thickened at base, 
tapering to their tips; they have two rows of short spines ex- 
tending nearly their entire length, those in the anterior row are 
smaller and more scattering than those in the posterior row. 
Fore tibiae with a small angle below at the tip projecting towards 
the femora; they have two rows of nearly erect spines on inner 
surface; those in anterior row more slender and numerous, 
extending the entire length of the tibia to the tip of the apical 
angle; those in posterior row a little stouter, about eight in 
number and not reaching base or tip. Tarsi blackish; joints of 
fore tarsi as 42-23-17-12-12; those of middle tarsi as 54-28-20-15- 
13; joints of posterior ones as 60-37-26-20-15; fifth joint of 
middle tarsus a very little widened. Calypters brown with white 
cilia. Knobs of halteres pale yellow. 
Wings tinged with brownish gray, with a cloud on the 
cross-vein; third vein bent backward at tip so as to approach 
fourth at tip, where they are one third as far apart as at the cross- 
vein. 
Described from one male taken at Chin, Alberta, May 3, 
1923, by H. L. Seamans. Type in the Canadian National Mu- 
seum. 
This is very much like intentus Aldrich. They have the 
same wing characters, about the same formation of the hypo- 
pygium and the form of the fore femora are about the same. 
This form has no black bristles above the fore coxae, the scu- 
cellum has only one pair of bristles, but the others may have 
been broken off, the first joint of the antennae are shorter, and 
the spines on the fore femora seem much shorter; these variations 
would seem to be enough to separate the species, and I am ven- 
