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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
any adults caught. Cattle at the mouth of the canyon had no culicids 
on them, but were plentifully infested by the horn-fly, Hcematobia 
serrata. 
The species so far definitely identified from Colorado or Wyoming 
are the following: 
(1) Anopheles quadrimaculatus Say. Recorded only from the far western part of 
the state, at Hotchkiss and Delta in Delta County, where it was taken by 
G. P. Weldon, as is recorded by Howard, Dyar and Knab. We have so far 
found no trace of Anopheles in our collections. In the vicinity of Grand Junc¬ 
tion, which is still nearer the western border, E. P. Taylor obtained four species 
of Culicidae, but they were Theobaldia incidens, Culex tarsalis, Aedes curriei 
and A. vexans. 
(2) Culex tarsalis Coq. Common at low altitudes, up to about 6,000ft., but not in 
the high mountains. It is particularly abundant at Boulder, coming into the 
University buildings. It is the only mosquito at present recorded from Colo¬ 
rado Springs. 
(3) Culex pipiens L. Recorded from Denver by Tucker in 1907, but the record 
needs confirmation. It was supposed to have been determined by Dyar, 
but Mr. Knab states that the determination must have been by Coquillett. 
(4) Theobaldia inornata Willist. Common at Boulder; also collected at Denver 
and Florissant, and by Philip Andrews at mouth of Cross Creek, two miles 
above Minturn. The altitudinal range in Colorado is about 5,000-9,800 ft., 
so far as ascertained. 
(5) Theobaldia incidens Thoms. Recorded from Grand Junction (E. P. Taylor), 
and Henderson and Andrews took it in S. Cottonwood Canon, near Buena 
Vista. It is decidedly less common with us than T. inornata , and seems not 
to go so high in the mountains. 
(6) Aedes acrophilus Dyar. Dr. Dyar has determined this from females and lar¬ 
vae; the male is unknown. I had regarded the species as a new one near 
pullatus, but at the time the description of acrophilus (Ins. Ins. Mens. 1917, 
p. 127) from Alberta was being printed. Our localities are: females from a 
mile southwest of Aspen; S. Cottonwood Canon, near Buena Vista; Cataract 
Creek, near Minturn; two miles west of Tennessee Pass. Larvae from four 
miles above Pando, East Fork of Eagle River, July 10 (P. Andrews). It is a 
mountain species in Colorado, belonging especially to the Canadian Zone. 
(7) Aedes aldrichi Dyar & Knab. Boulder (Cockerell); I determined it as al - 
drichi, and Dr. Dyar agrees. 
(8) Aedes cinereus Meigen. One female taken by Schwabe and Henderson at Box 
Elder Creek, 19 miles west of Douglas, Wyoming. I took it for a new species, 
on account of the bright ferruginous thorax, with three very faint dorsal dusky 
stripes. Very possibly it represents a subspecies, but more material is needed. 
Dr. Dyar assures me that it has entirely the structure of cinereus, and cannot 
possibly represent a distinct species. 
(9) Aedes curriei Coquillett. Common at lower altitudes in Colorado. Recorded 
from Grand Junction and Florissant, I have it from Boone, Boulder (it occurs 
on the University Campus), Grand R. above Glenwood Springs, Longmont, 
2\ miles north of Rifle, and Wolcott. The specimens from Wolcott and 
thirteen miles above Greenwood Springs have very handsome markings, and 
represent the variety mediolineata Ludlow. In Wyoming curriei was taken 
in the bottom lands at Basin, and at the North Platte Bridge near Wheat- 
