arr. 1, MOSQUITOES OF THE UNITED STATES—DYAR. 83 
Group TRICHURUS. 
AEDES (HETERONYCHA) TRICHURUS Dyar. 
Culex trichurus Dyar, Journ. N. Y. Ent. Soc., vol. 12, p. 170, 1904. 
A large dark-gray mosquito. Mesonotum gray on the sides, a 
dark brown band centrally joining the brown posterior lateral 
stripes, but these markings often diffused and not contrasted. Gen- 
erally a small whitish space in front of the lateral stripes. Abdo- 
men black, with broad basal segmental white bands, even; venter 
whitish-scaled. Legs black, the femora white towards base nearly 
to tip below. Wing scales black. 
The winter is passed in the egg state, the larvae developing in the 
early ground-pools, in the forest. The male is unknown. The 
adults fly in woods, but disappear early in the season. 
Distribution—Western slope of Rocky Mountains in British 
Columbia and Montana. 
United States Records. 
Montana: Whitefish, June 16, 1921 (H. G. Dyar). 
Belton. June 28, 1921 (H. G. Dyar.) 
AEDES (HETERONYCHA) CINEREOBOREALIS Felt and Young. 
Culex cinereoborealis Fett and Youna, Science, n. s., vol. 20, p. 312, 1904. 
Aédes poliochros Dyar, Ins. Ins. Mens., vol. 7, p. 35, 1919. 
A large dark-gray mosquito. Mesonotum gray on the sides, with 
moderate central brown band, widening squarely behind from junc- 
tion with the posterior lateral stripes. The marking is often faint 
or diffused. Abdomen black, with even basal segmental white bands, 
and a few scattered white scales, especially posteriorly; venter 
whitish. Legs black with some scattered scales, the femora whitish 
below. Wing scales all black. 
The larvae occur in early spring pools in forest and leafy shaded 
ditches along roads. The mating habits of the males have not been 
observed. The adults disappear early in the season. The form is 
to be considered as a race of trichurus. There are slight larval dif- 
ferences, but the male genitalia have not been compared. 
Distribution—Southern fringe of the Canadian forest area, 
southern Canada, New England, New York and Minnesota. 
United States Records. 
New HaAmpsuHireE: Dublin, May, 1909 (A. Busck). 
Pike, May 25, 1908 (A. D. Hopkins). 
MASSACHUSETTS: Chicopee, May 17, 1908 (A. D. Hopkins). 
Springfield (G. Dimmock). 
