ART. 1. MOSQUITOES OF THE UNITED STATES—DYAR. 63 
AEDES (HETERONYCHA) ALDRICHI Dyar and Knab. 
Aédes aldrichi Dyar and Knap, Proc. U. 8. Nat. Mus., vol. 25, p. 57, 1908. 
Aédes vinnipegensis Dyan, Ins. Ins. Mens., vol. 8, p. 34, 1919. 
A small dark-gray mosquito. Mesonotum yellowish, with two 
median dark-brown lines and short posterior lateral ones. Abdomen 
black, with basal segmental white bands, often narrowed in the 
middle; venter whitish. Legs black, largely whitish below, the 
femora white below. Wing scales all blackish. 
The larvae occur in river flood water in shaded alder bottoms. 
The adults are often extremely small, so as to pass through window 
screens. They inhabit the woods in river bottoms, not coming out 
into the open country. The swarming of the males occurs in the 
shade even by day. The adults are voracious biters. 
Distribution.—River valleys of the Rocky Mountain watershed, 
both east and west. 
United States Records. 
Montana: Big Timber, July 14, 1917 (H. G. Dyar). 
Laurel, July 16, 1917 (H. G. Dyar). 
Youngs Point, July 14, 1917 (H. G. Dyar). 
Park City, July 14, 1917 (H. G: Dyar). 
IpAHo: Lewiston, June 16, 1902 (J. M. Aldrich). 
Market Lake, October 28, 1901 (J. M. Aldrich). 
OREGON: Hood River, July 7, 1917 (F. R. Cole). 
Montavilla, July 26, 1920 (H. G. Dyar). 
WASHINGTON: Oysterville, June 21, 1918 (H. K. Plank). 
Sumas, July 15, 1920 (H. G. Dyar). 
AEDES (HETERONYCHA) GONIMUS Dyar and Knab. 
Aédes gonimus DYAR and Kwap, Ins. Ins. Mens., vol. 5, p. 165, 1917. 
A small blackish mosquito. Mesonotum gray, with slight golden 
tint; two narrow, hairlike, dark brown lines. Abdomen black, with 
broad straight basal segmental white bands, widened a little at the 
sides; venter whitish, with narrow black bands at the apices of the 
posterior segments. Legs black, the femora whitish beneath. Wing 
scales all dark, appearing uniform. 
The male and larva are unknown, and the species has not recurred 
to us since the original types. It is surmised that this is a flood species 
of the aldrichi group, but nothing certain is known of it. 
Habitat—Central Texas. 
United States Records. 
Texas: Kerrville, June 20, 1907 (F. C. Pratt). 
AEDES (HETERONYCHA) IMPIGER Walker. 
Culex impiger WALKER, List Dipt. Brit. Mus., vol. 1, p. 6, 1848. 
Aédes decticus Howarp, Dyar, and Knap, Mos. No. & Cent. Amer. & W. I., 
vol. 4, p. 787, 1917. 
