arr. 1. MOSQUITOES OF THE UNITED STATES—DYAR. 39 
mottled reflection. Abdomen blackish, with whitish scales over 
most of the surface, leaving oblique paired lines on each segment; 
venter peppered black and whitish. Legs blackish, densely pep- 
pered, the femora with a pale ring before tip. Tarsi with broad 
white rings at the bases of the joints, the first hind tarsal also broadly 
white in the middle, leaving only a black ring near base and at tip. 
Wing scales black and whitish, three black marks on the costal edge, 
the first at middle, the last apical; a spot on the sixth vein; fringe 
conspicuously spotted. Proboscis broadly whitish in the middle. 
The larvae develop rapidly in temporary rain pools in arid coun- 
try. The adults bite much as the other prairie species, by day as well 
as evening, in the open. The males swarm after sunset over the 
prairie. 
Distribution.—Arid valleys west of the Mississippi from northern 
Mexico to Montana. 
United States Records, 
MonTANA: Glasgow, July 11, 1921 (H. G. Dyar). 
Poplar, July 20, 1921 (H. G. Dyar). 
Laurel, July 16, 1917 (H. G. Dyar). 
Texas: Camp McAllen, August 28, 1921 (Army Medical Museum). 
San Antonio (Army Medical Museum). 
Austin, August 10, 1908 (A. W. Morrill). 
Laredo (T. D. Berry). 
New Mexico: Mesilla, October 4, 1898 (T. D. A. Cockerell). 
ARIZONA: Willcox, July 31, 1909 (A. K. Fisher). 
PSOROPHORA (GRABHAMIA) DISCOLOR Coquillett. 
Culex discolor CoQUILLET?T, Can. Ent., vol. 35, p. 256, 1903. 
A medium-sized light-brown mosquito with mottled wings. Meso- 
notal integument blackish, covered with fine pale golden scales, not 
obscuring the integument. Abdomen peppered, with apical pale 
bands, forming a median pale line. Wings with the costa dark, a 
pale mark at outer third, but not spotted; wing scales dark and pale, 
dense in spots, forming mottlings, especially at base of third vein, 
forks of second and fourth, a line on upper fork of fifth. Legs pep- 
pered, femora with a pale ring before apex; tarsi with white rings at 
the bases of the joints, the hind tibia also broadly whitish in the 
middle. Proboscis with broad whitish ring. 
This species is much like signipennis, but the wings do not have 
the conspicuous costal spots. The larvae live in temporary rain pud- 
dles, but not in the arid regions, preferring a more abundant rain- 
fall. The larvae are peculiar, for whereas all the other Psorophora 
larvae, with the exception of the predaceous species, have greatly 
enlarged air tubes, this one has a small air tube, but greatly enlarged 
antennae. We have no observations on the biting habits. 
Distribution.—Southern States to Mexico. 
