ART. 1, MOSQUITOES OF THE UNITED STATES—DYAR, 61 
AEDES (HETERONYCHA) IDAHOENSIS Theobald. 
Grabhamia spencerii idahoénsis THEOBALD, Mon. Culic., vol. 3, p. 250, 1903. 
A rather small dark-gray mosquito, inhabiting open, dry country. 
Mesonotum dark brown in the middle, a grayish stripe on each side 
on the margin and over antescutellar space. Abdomen with gray- 
ish white bands at the bases of the segments, narrowed centrally, and 
a few white scales at the apices of the segments also; venter whitish. 
Legs black and grayish white, the latter color predominating be- 
neath; femora white below. Wings with the costa, first, third, and 
fifth veins black scaled, the alternating ones white scaled. 
In some specimens there is a more or less complete band of pale 
scales down the middle of the abdomen, and these are indistinguish- 
able from spencerit. 
The winter is passed in the egg state, the larvae developing in 
early spring pools. The adults inhabit open country, avoiding tim- 
ber. The males swarm after sunset over prominent objects. There 
are larval differences between idahoénsis and spencerii, and they 
do not occupy the same territory; but the adults, under exceptional 
circumstances, may be confused. 
Distribution.—Dry valleys from Colorado and Montana to Nevada 
and Washington. 
United States Records. 
WASHINGTON: Okanogan (A. K. Millay). 
IpAHO: Market Lake (J. M. Aldrich). 
Pocatello, June 24, 1904 (EK. S. G. Titus). 
Montana: Bozeman, July 12, 1917 (J. R. Parker). 
Drummond, July 10, 1917 (H. G. Dyar). 
Missoula, July 6, 1917 (H. G. Dyar). 
Whitehall, July 11, 1917 (H. G. Dyar). 
Park City, July 14, 1917 (H. G. Dyar). 
NeEvADA; Elburz, June 25 1903 (H. S. Barber). 
Carlin, June 6, 1920 (H. G. Dyar). 
UraH: Ogden, June 20, 1920 (H. G. Dyar). 
Montana: Big Timber, July 14, 1917 (H. G. Dyar). 
Glen, July 10, 1917 (H. G. Dyar). 
Laurel, July 16, 1917 (H. G. Dyar). 
Lake View, August 2, 1920 (A. N. Caudell). 
CoLorabpo: Whittier Range, Cochetopa National Forest, July 9, 1911 (A. K. 
VWisher). 
Carbondale, July 19, 1917 (P. Andrews). 
Florissant, July 4 (T. D. A. Cockerell). 
AEDES (HETERONYCHA) HIRSUTERON Theobald. 
Culex hirsuteron THEOBALD, Mon. Culic., vol. 2, p. 98, 1901. 
Culex pretans GROSSBECK, Ent. News, vol. 15, p. 332, 1904. 
A rather small, dark-gray mosquito. Mesonotum dark brown in 
the middle, gray on the sides and over the antescutellar space. Ab- 
