art. 1. MOSQUITOES OF THE UNITED STATES—DYAR. 713 
AEDES (HETERONYCHA) MUTATUS Dyar. 
Aédes mutatus DyYAr, Ins. Ins. Mens., vol. 7, p. 24, 1919. 
A rather large brown mosquito with ringed legs. Mesonotum gray, 
with two median brown bands and short side stripes, more or less 
mixed with the gray and mottled, forming pale spots. Abdomen 
black, with basal segmental white bands, the posterior ones strongly 
widened at the sides; venter pale, with more or less distinct black 
spots at the bases of the segments mesially. Legs black, the femora 
and tibiae pale below; tarsi black, with broad white rings at the bases 
of the joints, except the last joint. Wang scales black, some white 
ones sometimes present subcostally. 
The larvae live in pools along rivers, following the high water of 
spring. They have a short air tube like ordinary Aédes larvae. The 
adults frequent timbered country till late in the season. The species 
is to be considered a race of inerepitus Dyar. 
Distribution—Rocky Mountain region, British Columbia to New 
Mexico. 
United States Records. 
WASHINGTON: Spokane, July 12, 1917 (H. G. Dyar). 
IpAHO: Juliaetta, April 21, 1899 (J. M. Aldrich). 
MoNnTANA: Missoula, July 6, 1917 (H. G. Dyar). 
Drummond, July 10, 1917 (H. G. Dyar). 
Bozeman, July 12, 1917 (H. G. Dyar). 
Evaro, July 7, 1917 (H. G. Dyar). 
Laurel, July 16, 1917 (H. G. Dyar). 
UraH: Sait Lake County, April 12, 1914 (C. T. Voorhies). 
Wyrominec: Yellowstone Park, July 27, 1907 (W. E. Britton). 
CoLtoravo: Florissant, July 4 (T. D. A. Cockerell). 
AEDES (HETERONYCHA) INCREPITUS Dyar. 
Aédes increpitus Dyar, Ins. Ins. Mens., vol. 4, p. 87, 1916. 
A large blackish mosquito with ringed legs. Mesonotum gray, a 
brown central band and short posterior side stripes, more or less 
confused and mottled. Abdomen black, with basal segmental white 
bands; on the posterior segments some white scales at the tips of the 
segments also; venter white, with traces of basal segmental black 
spots. Legs black, with many white scales intermixed, femora and 
tibiae pale below; tarsi with white rings at the bases of the joints, 
broadest on the hind legs, except the fifth joint. Wing scales usually 
wholly black. 
The larvae live in spring pools in river valleys and edges of lakes. 
The larva has a short air tube. The adults live a long time in tim- 
bered country. The males swarm after sunset over bushes and small 
trees. 
Distribution —F orested regions of California and Nevada. 
