ART. 1. MOSQUITOES OF THE UNITED STATES—DYAR, 79 
whitish, with a row of black dashes on middle line. Legs black, 
with many white scales intermixed on femora and tibiae, the tarsi 
with white rings at the bases of the joints, broad on the hind pair. 
Wings with black scales, with more or less white ones intermixed, 
especially along costal region. 
The adult females are not certainly distinguishable from excrucians 
and stimulans. This species is commonly smaller than those and 
often has many white scales on the wings, the mesonotum is often 
clear gray on the sides, but none of the characters hold. The species 
is less closely addicted to forests than excrucians, being common on 
the prairies where some cover exists, and in the half-open country of 
the Yukon region. The males swarm as with excrucians and stimu- 
lans, there being no differences in these habits between the three. 
The winter is passed in the egg state, the larvae developing in early 
spring water, often with excrucians. The adults fly till late in the 
season, not entering houses. 
Distribution—FKastern forests to the Canadian Plains. 
United States Records. 
Nrw HAMPSHIRE: Dublin (A. Busek). 
MASSACHUSETTS: Mount Holyoke, April 15, 1905 (Dyar and Knab). 
Longmeadow, April 16, 1905 (Dyar and Knab). 
Springfield, May 17, 1905 (F.. Knab). 
NEw York: Plattsburgh, April 24, 1905 (H. G. Dyar). 
Watkins, May 13, 1920 (H. G. Dyar). 
WISCONSIN: Saxeville, May 22, 1909 (B. K. Miller). 
AEDES (HETERONYCHA) MIMESIS Dyar. 
Aédes mimesis Dyar, Ins. Ins. Mens., vol. 5, p. 116, 1917. 
A large blackish mosquito with ringed legs. Mesonotum light gray 
at the sides, a broad brown central band and short posterior side 
lines. Abdomen black above, with triangular segmental basal white 
spots, separated from the lateral spots in some cases; posterior seg- 
ments white tipped also; venter white scaled with more or less of 
median narrow black line. Legs black, the femora and tibiae with 
many white scales, and pale beneath, tarsi black, with white rings at 
the bases of the joints, rather broad on the hind legs. Wing scales 
black, with many white ones intermixed on all the veins. 
The larvae occur in marsh pools in the spring. This form is con- 
sidered a race of fitchii, from which there are small larval differ- 
ences.?° 
Distribution —Rocky Mountain region, Montana to the Yukon 
Valley in Canada. 
16 Dyar, Ins. Ins. Mens., vol. 8, p. 15, 1920. 
