art. 1. MOSQUITOES OF THE UNITED STATES—DYAR. 75 
AEDES (HETERONYCHA) ALOPONOTUM Dyar. 
Aédes aloponotum Dyar, Ins. Ins. Mens., vol. 5, p. 98, 1917. 
A large reddish-brown mosquito, with ringed legs. Mesonotum 
more or less reddish in the integument, clothed with reddish-brown 
scales, nearly uniform in color and showing no gray except pos- 
teriorly. Abdomen black, with basal segmental yellowish white 
bands and scattered scales; venter pale yellowish, with median basal 
segmental black spots. Legs black, the femora and tibiae with many 
yellowish scales intermixed, pale beneath except tip of tibia; first 
tarsal joint pale nearly to tip, the rest black with basal white rings, 
broad on the hind legs. Wing scales black, with more or less pale 
yellowish ones toward costal region. 
The male, larva and habits are unknown. Scattered females only 
have been taken. It is surmised that this may be a race of flavescens, 
but nothing certain is known. 
Distribution—Western Washington and British Columbia. 
United States Records. 
WASHINGTON: Ashford, August 1, 1906 (Dyar and Caudell). 
Hoodsport, July 7, 1920 (H. G. Dyar). 
Lake Cushman, June 28, 1917 (H. G. Dyar). 
AEDES (HETERONYCHA) MERCURATOR Dyar. 
Aédes mercurator Dyar, Ins. Ins. Mens., vol. 8, p. 13, 1920. 
A large blackish mosquito with ringed legs. Mesonotum clear 
gray on the sides, a little yellowish; a broad red-brown band in the 
center and posterior short side stripes. Abdomen black above, with 
narrow basal segmental white bands, widening to triangular spots 
on the sides; venter pale gray, with medioventral black band, ex- 
cept on the posterior segments. Legs black with white scales inter- 
mixed, the femora and tibiae pale below; tarsi black, with white 
rings at the bases of the joints, those on the hind legs broad. Wing 
scales wholly dark. 
This form, considered to be a race of stimulans, develops in river 
flood pools, apparently flood filled, not seepage filled. The adults 
frequent the wooded areas in the river valleys and vicinity. The 
description is made from the types; but the coloration doubtless 
varies, so that the species can not be distinguished from its allies 
except by the male genitalia. 
Distribution—Upper Yukon Valley in Canada, doubtless in 
Alaska at least as far as the southward bend of the river; but no 
males are at hand. Females of this type have been taken at many 
points in Alaska, but it is impossible to make a positive determina- 
tion without the male. 
