7138

• UCREFRP Catalog Number: 7138
• Author: Jordan, D. S.
• Title: Report of Explorations in Colorado and Utah during the Summer of 1889
• USFW Year: 1891
• USFW - Doc Type: Bulletin of the United States Fish Commission
• Copyright Material: NO

`?2 BULLETIN OF THE UNITED STATES FISH COMMISSION.
CgualiusLonnparte, (probably including Tcle•ctcsBonaparte=Tigoma, Cheonda, Siboma.,
nr.d Clinostomus Girard and Protol)orus Coke).
3. Rutilus R;ifinesclne (=Lcuc•iscus Heckel, Giinther=bem•os lleckel=Pi.gus Bona-
parte; possibly should include Mylolcucns Cope) species with the teeth 4-5 instead
of 5-6 or 5-5, as in Rutilus.)
3. Alburnuc Rafinecclne=Alhuruus Heckel.
4. Pho.rinu.s Rafinesclue=Pho.c•inus Agassiz.
For the present, at least, until better definitions can be given, we may refer the
American fspeciesto the genus Leuciscus in which they form a subordinate group (Ti-
goma or Telcstcs) distinguished by the smaller number of teeth and the generally smaller
scales.
3. Rhinichthys dulcis (Girard), A., D., C. (Rhinichihyp hanan ontanw, Cope.)
Very common. We are unable to distinguish our specimens from the Rio Grande,
from those taken by us in the Arkansas, Platte, and Yellowstone. As the types of
Rhinichthys transmont.anus are from New Mexico, we regard the latter species as a syno-
nym of R. dulcis. Rhinichthys ma.a•illosus Cope, originally described from Kansas, is the
same as R. dulcis.
4. Salmo mykiss Walbanm, D., C. (Var. spilunis Cope.)
Abundant in the upper Rio Grande, and in all tributary streams clown to the level
of the valley.
The Rio Grande tront have the dark spats 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 weigbt,
but are doubtless not as large as the trout of the Upper Colorado. The Rio Grande
trout was first described as a distinct species by Professor Cone under the name of
Sa.lmo syilurus. The types of this nominal species came from the Sangre de Cristo.
D.-COLORADO BASIN.
The Colorado River is formed by the union of two large rivers, Green River and
Grand River. Loth of these bave their source in the mountain streams of the west-
ern slope of the. Rockies, and are yerN- clear and cold in their upper courses. Lower
clown they become gradually tier-bid and yellow and finally- the Colorado becomes one
of our muddiest streams. The headw nters everywhere are full of trout, and all the
tributary lakes, inany of which exist in northwestern Colorado, are especially- well
stocked. The fish fauna of t his great. river is cry scanty. lu the highlauds the trout
is accompanied by <Igosia only. Lower down the """lob" appears; still lower the
suckers, four species in all in the upper waters, and with them the mound-tail (Gila
robusta) and the ({ White salmon" (Ptyc•hocheilu-s). This is the largest and best foot].
fish of the Lower Colorado and the largest of the carp family in America. The Sony.
tail (Gila elegaus) is found still lower clown, while in Arizona the fanny is further in-
creased by the addition of three or four more suckers and of species of Leu.ciscits,111eda,
and other genera'of chubs and minnows. Collections were made by us at the follow-
ing localities :
1. Grand Ri.rer, at Glenwood Springs, Colo.-Tbe Grand River rises in the middle
of northern Colorado tiowiuB sonthR-estward tlirongh sleep Borges. Glenwood Springs
lies at the foot of its deepest canon. The water is here yellow and muddy, but the