1926 ] New Species of North Americau Dolichopodidce 
47 
edge near the tip; posterior femora with a row of six small 
bristles on lower anterior edge of apical half and three on posterior 
edge near the tip; fore and middle tibiae each with five to seven 
small bristles below. Tarsi black with white hair; middle and 
hind basitarsi with a row of minute black spines below. Joints 
of fore tarsi as 31-14-14-10-11; of middle pair as 51-24-20-14-13; 
those of posterior tarsi as 43-31-24-16-12. Calypters yellow 
with white cilia. Halteres yellow. 
Wings grayish hyaline, without spots on the veins; veins 
black, not yellow at root of wing; last section of fourth vein 
nearly straight; third vein bent a little backward at tip. 
Female: Length 3.5 mm.; of wing 5 mm. Pollen of face 
more brown on upper portion, yellow on lower part, becoming 
white along the orbits, the pollen scarcely concealing the ground 
color. Fore femora with a single row of spines below in the 
middle for half their length. Otherwise about as in the male. 
Described from two males and one female, taken at Kom- 
loops, British Columbia, July 30, by N. Criddle. 
Type in the Canadian National Collection. 
Hydrophorus albomaculatus new species. 
Female: Length 5 mm. of wing 6 mm. Face wide, its sides 
nearly parallel, opaque with white pollen. Palpi black, their 
pollen and hair white. Cheeks wide, extending as far down as 
the tips of the palpi. Front opaque with brown pollen. An- 
tennae black; first joint as long as the last two taken together; 
third nearly square in outline; arista thick, as long as the an- 
tenna. Beard abundant, long, white; the black orbital cilia 
decend to apical fourth of the eye; postvertical bristles in a 
row of four on each side, extending to the orbital cilia. 
Thorax blackish with three lines along the rows of bristles 
which are more gray with pollen; humeri and narrow lateral 
edges of the dorsum white pollinose; three black propleural 
bristles above each fore coxa and long white hairs above and 
below these bristles ;scutellum with four pairs of marginal bristles, 
the outer pair small; there are several small pale hairs on the 
pleurae above middle coxae. Abdomen black, thickly covered 
