23 -THE FISHES OF THE COLORADO BASIN. 
By barton W. EVERMANN and cloud. RUTTER. 
In this paper we have attempted to indicate in succinct form onr present knowl- 
edge of the geographic distribution of the fishes in the basin of the Colorado Eiver of 
the West. The approximate area drained by the Colorado and its tributary streams 
is 225,049 square miles. This embraces’ all of the Territory of Arizona, a narrow strip 
along the entire length of the western side of New Mexico, a large part of western 
Colorado, a portion of southwestern Wyoming, nearly all ol' the eastern half of Utah 
and a narrow stri]) in the southwestern part of that Territory, and a small j)ortion of 
the comparatively arid region of southeastern California. 
The Colorado is more than 1,200 miles in length, and is, next to the Columbia, 
the greatest river of onr Western States. It has its ilse in the Wind Eiver Mountains 
of Avestern Wyoming, near the headwaters of four other great riAmrs, the North Platte, 
the Big Horn, the Yellowstone, and the Snake, and tloAvs southward through Wyo- 
ming into Utah, just touching the northwest corner of Colorado. Until joined by the 
Grand EiA^er in Utah, in about latitude 40° 20', it is known as the Green Eir'er. The 
area drained by the Green Eiver is about 47,222 s<piare miles. Near the middle 
of the south line of Utah the Colorado passes into Arizona, then, flowing westward 
through the Grand Canyon, reaches the Nevada line. After receiving the Eio Virgen 
from the north, the Colorado turns abruptly southward and pursues this general 
direction until it reaches the Gulf of California, into which it flows about 50 miles 
south of the international boundary. It forms over two-tliirds of the boundary line 
between Arizona and Nevada, and all of that between Arizona and California. 
The following is a classified list of the rivers and more important creeks of the 
Colorado Basin. Those in which collecting has been done are printed in italics: 
Colorado River : 
Cila River, 
Santa Cruz River. 
San Pedro River. 
Babacomari River. 
Salt River. 
White Mountain Creek. 
Aqua Frio Creek. 
Cataract Creek. 
Little Colorado River. 
ZinVi River. 
San Juan RiA^er. 
Rio de las Animas Perdklas. 
Mineral Creek. 
Letter Creek. 
Rio Florida. 
Rio de las Piedras. 
Pagosa Springs. 
Colorado River — Continued. 
Grande River. 
Gunnison River. 
Uncompahgre River. 
Cimarron Creek. 
Toinichi Creek. 
Sweetwater Lakes. 
Trapper Lake. 
Eagle River. 
Roaring Fork. 
Canon Creek. 
Green River. 
White River. 
Yampa Rh er. 
Little Snake River. 
Duchesne Rii'er. 
San Rafael River. 
Dirty Devil Eiver. 
Price River. 
Virge/i River. 
473 
