196 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Wyoming, Nebraska, the Dakotas, and some adjacent regions. It is 
not probable that Anopheles is actually absent from, all this area, but 
even if locally present it can often be readily exterminated, owing to 
the limited possible breeding places. It was obvious, however, that 
our knowledge was extremely incomplete, and it seemed desirable to 
determine the actual facts relating not merely to Anopheles , but to the 
Culicidae of the region generally. With this purpose in view, a mos¬ 
quito survey of Colorado was begun this year. It was also planned to 
include Wyoming, from which it appeared that only one species 
(Aedes nigromaculis) was recorded, and collections were made in sev¬ 
eral localities. I recently learned, however, that Dr. John W. Scott 
and Mr. O’Roke of the University of Wyoming had taken up the 
Culicidae of their state, and consequently we shall restrict ourselves to 
Colorado, merely presenting below the few Wyoming records already 
obtained. So far as recorded by Howard, Dyar and Knab, the Culi¬ 
cidae of Colorado number seven species, referable to Anopheles, Culex, 
Aedes and Theohaldia. The material came from nine localities. Our 
own collections, prior to 1917, were of little value. During the past 
summer Professor Junius Henderson of the University of Colorado 
made two long trips in a Ford car, the first in Colorado, the second in 
Wyoming. On these journeys Culicidae were collected whenever pos¬ 
sible, and the collections thus obtained greatly extend our knowledge 
of distribution. The localities represented are as follows: 
(A.) Colorado (J. Henderson and P. Andrews). 
(1) Eastern slope. 
(a) Pueblo County. One mile east of Avondale, June 27; 
Boone, 4,477 ft. alt., June 28. 
(b) Chaffee County. River bottom 3 miles southwest of 
Salida, July 1; S. Cottonwood Canyon, west of Buena 
Vista, 8,500 ft., July 4. 
(c) Lake County. Upper Twin Lake, about 9,020 ft., July 5; 
two miles south of Leadville Junction, July 6 r Seven miles 
south of Leadville, at 9,300 ft., July 8, Prosimulium fulvum 
(Coq.) was taken. 
(2) Western slope. 
(a) Eagle County. Two miles west of Tennessee Pass, July 9; 
four miles above Red Cliff, 8,850 ft., July 12; Cataract 
Creek, east fork of Eagle River, above Minturn, July 9; 
two miles above Minturn, at mouth of Cross Creek, July 
14; four miles above Pando, east fork of Eagle River, July 
10 (larvae and pupae); Wolcott, 6,965 ft., August 2; six 
miles above Wolcott, July 16; McCoy, August 4; creek 
