1926] New Species oj North American Dolichopodidce 
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with reddish border and white cilia. Halteres blackish, stem 
yellow in the middle. 
Wings grayish, strongly tinged with brown in front of third 
vein as far as tip of second; veins without spots; last section of 
fifth vein straight, third considerably bent back near the tip; 
veins wholly black. 
Described from a single male taken at Aweme, Manitoba, 
April 8, 1925, by N. Criddle. 
Type in the Canadian National Collection. 
Hydrophorus argentifacies new species 
Male : Length 2 . 7 mm. ; of wing 3 . 5 mm. Face wide below, 
narrowed above, silvery white, slightly brown just below the 
antennae, in certain lights it is tinged with green because of the 
ground color. Palpi black with gray pollen and pale hair. Front 
green with brown pollen, antennae black, short, third joint nearly 
round in outline. Beard yellow, the black orbital cilia decend to 
about the middle of the eye. Cheeks narrow, truncate below. 
Dorsum of thorax and its pollen brown; pleurae and ab- 
domen green, dulled with white pollen, the latter with black hair, 
except on lower edge of the sides; propleurae with one black 
bristle and several white hairs on each side above fore coxa; 
sides of pleurae bare; scutellum with two pair of marginal bristles. 
Hypopygium black, its appendages short, rounded, about as long 
as wide, with only short hair on apical edge. 
Fore coxae green with yellowish hair on anterior surface, no 
black bristle at tip; middle and hind coxae black with gray pollen. 
Femora and tibiae green with black hair, except on anterior tibiae. 
Fore femora thickened on basal portion, narrowed at tip; they 
have a few short spines below, apparently in a single row (cannot 
see them very well in the type), their tibiae with the usual row of 
spines below; middle and hind femora without a bristle below, 
except a small one near the tip, posterior tibiae without, middle 
ones with one small bristle below, tarsi dark brown; fifth joint of 
middle ones black and slightly widened. Joints of fore tarsi as 
30-16-15-10-12; of middle ones as 43-18-15-10-8, fifth joint 5 
wide; posterior tarsi with their joints as 43-24-19-11-10. Calyp- 
