22 .BULLETIN OF THE UNITED STATES FISH COMMISSION. 
SqualiusBouaparte, (probably iucludiug TelestesBonaimrtQ=Tigoma, Clieonda, Sihoma^ 
ard Clinostomus Girard and Protoqjorus Cope). 
2. R'litilus Eafiaesque {=Leuciscus Heckel, Giintber= Lewcos Heckel = P'i( 7 i(s Bona- 
parte ; possibly should include Myloleucus Cope) species with the teeth 4-5 instead 
of 5-6 or 5-5, as in Butilus.) 
3. Alburmis Baiinesqae =Alhwrnus Heckel. 
4. Pho.vinus Eafinesque=P/(oa*mMs Agassiz. 
For the present, at least, until better definitions can be given, we may refer the 
American species to the genus Leuciscus in which they form a subordinate group [Ti- 
gomaox Telestes) distinguished by the smaller number of teetli and the generally smaller 
scales. 
3. Rhinichthys diilcis (Girard), A., D., C. {Rhinichthys transmontanus Cope.) 
Very common. We are unable to distinguish our specimens from the Eio Grande, 
from those taken by us in the Arkansas, Platte, and Yellowstone. As the types of 
Rhinichthys transmontanns are from New Mexico, we regard the latter species as a SAmo- 
nym of B. dulcis. Rhinichthys maxillostts Cope, originally described from Kansas, is the 
same as R. dulcis. 
4. Salmo mykiss Walbaum, D., C. (Var. spiluriis Cope. ) 
Abundant in the upper Eio Grande, and in all tributary streams down to the level 
of the valley. 
The Eio Grande trout have the dark spots rather large and more or less confined 
to the dorsal and caudal fins and the region between them, though often, especially in 
the young, extending on the head. They reach a fair size, a pound or two in weight, 
but are doubtless not as large as the trout of the Upper Colorado. The Eio Grande 
trout was first described as a distinct species by l^rofessor Cope under the name of 
Salmo spilurus. The types of this nominal species came from the Sangre de Cristo. 
D.— COLORADO BASIN. 
The Colorado Eiver is formed by the union of two large rivers, Green Eiver and 
Grand Eiver. Both of these have their source in the mountain streams of the west- 
ern slope of the Eockies, and are very clear and cold in their upper courses. Lower 
down they become gradually turbid and yellow and finally the Colorado becomes one 
of our muddiest streams. The headwaters everywhere are full of trout, and all the 
tributary lakes, many of which exist in northwestern Colorado, are especially well 
stocked. The fish fauna of this great river is very scanty. In the highlands the trout 
is accompanied by Agosia only. Lower down the “Blob” appears; still lower the 
suckers, four species in all in the upper waters, and with them the Eound-tail {Qila 
robusta) and the “White salmon” (Ptychocheilus). This is the largest and best food- 
fish of the Lower Colorado and the largest of the carp family in America. The Bony- 
tail {Gila elegans) is found still lower down, while in Arizona the fauna is further in- 
creased by the addition of three or four more suckers and of species of Leuciscus, Meda, 
and other genera of chubs and minnows. Collections were made by us at the follow- 
ing localities : 
1. Grand River, at Glen wood Springs, Colo. — The Grand Eiver rises in the middle 
of northern Colorado fiowing southwestward through deep gorges. Glenwood Springs 
lies at the foot of its deepest canon. The water is here yellow and muddy, but the 
