70 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
The winter is passed in the egg state, the larvae developing in early 
ground puddles. The males swarm after sunset over prominent 
objects on the prairie. The females are persistent biters, especially 
abundant after sunset. 
Distribution.—Europe, Asia, and North America in dry, open coun- 
try and prairies; central United States to Canada; also as a salt- 
marsh breeder on the coasts of the Atlantic, Pacific, and Hudson Bay. 
United States Records. 
WASHINGTON: West Seattle, August 11, 1906 (Dyar and Caudell). 
Oroville, June 6, 1919 (A. C. Burrill). 
OREGON: Klamath Falls, July 27, 1906 (Dyar and Caudell). 
CALIFORNIA: Thrall, July 25, 1906 (Dyar and Caudell). 
Niles, August 31, 1901 (C. S. Jones) 
Antelope Valley, June 21, 1916 (H. G. Dyar). 
Nevapa: Reno, July 24, 1915 (H. G. Dyar). 
UraH: Grand Junction, September 11, 1905 (W. A. Hooker). 
CotorApo: Florissant, July 10, 1907 (S. A. Rohwer). 
New Mexico: Pecos, June 24 (T. D. A. Cockerell). 
IpaHo: Market Lake, June 18, 1901 (J. M. Aldrich). 
Montana: Laurel, July 16, 1917 (H. G. Dyar). 
NortH Daxota: Devils Lake, July 17, 1921 (H. G. Dyar). 
NEBRASKA: Lincoln, May ( Ne 
Wisconsin: Madison (S. J. Holmes). 
MINNESOTA: East Grand Forks, July 22, 1921 (H. G. Dyar). 
ILLINoIs: Chicago, May 4, 1900 (O. A. Johannsen). 
MASSACHUSETTS: Boston, July 16, 1906 (C. W. Johnson). 
New York: Ithaca, May 16, 1900 (O. A. Johannsen). 
PENNSYLVANIA: Philadelphia, June 15, 1918 (H. Hornig). 
LOUISIANA: Delta, June 20, 1904 (E. S. G. Titus). 
AEDES (HETERONYCHA) CAMPESTRIS Dyar and Knab. 
Aédes campestris Dyar and Knas, Journ. N. Y. Ent. Soc., vol. 15, p. 213, 
1907. 
Aédes callithotrys Dyar, Ins. Ins. Mens., vol. 8, p. 16, 1920. 
A rather large yellowish-gray mosquito, the tarsi banded with white, 
but sometimes very inconspicuously. Mesonotum creamy yellowish, a 
diffused brown stripe in the middle of variable width, and a litle 
brown on the lateral margins. Abdomen with grayish white basal 
segmental bands, and a longitudinal mid-dorsal line, cutting the 
black ground into paired quadrate spots; venter pale, with median 
row of black spots. The pale scales on the abdomen vary, some- 
times covering the whole surface. Legs black, with white scales 
intermixed, femora white below; tarsi with dull white rings at 
both ends of the joints. Wing scales dark and whitish, rather evenly 
intermixed. 
The winter is passed in the egg state; the larvae occur early in 
ground pools, often charged with mineral matter. The males swarm 
