EXPLORATIONS IN COLORADO AND UTAH. 
7 
Collections were made at the following points : 
1 . HartseVs Hot Springs, in the South Park, about 15 miles below the foot of the 
Park Range. — The South Platte here flows through grassy meadows, a fairly clear 
stream, a little soiled by the seepage from the irrigating ditches. Water rather cold, 
about C5°. In summer the stream is about 10 feet broad, 2 to 3 feet deep, with many 
deep holes in its windings. It is literally full of suckers ( Gatostomus griseus). Bhinich- 
tlujs dulcis is also abundant, but no other species were seen. Trout are found in the 
mountains above and frequently descend to the level of the i^ark where they are carried 
out over the fields by the irrigating ditches. It is said that a washtub full of young 
trout were picked up from the ditch at Hartsel’s last fall. Species from this locality 
are marked U. 
2. Denver. — Collections were made in the Platte at the bridge just below the 
mouth of Bear Creek, 6 miles above Denver. The river is there 1 to 6 rods wide and 
2 to 4 feet deep. Temperature about 72°. The water is grayish or brownish, nearly 
clear, with a bottom of gravel and sand. Pishes are very abundant, nine species being 
taken. These are marked D in the following list. 
At its mouth. Bear Creek is clear, but very warm, the water being all seepage from 
irrigating ditches. It contains the same species as the river. 
3. Bear Greelc, above Morrison. — Seined at a point 10 miles up the canon from Morri- 
son, near Hines’s. The stream is here about 20 feet wide and 3 feet deep. The water is 
clear and swift, with a bottom of gravel and boulders. Temperature aboiit 67°. 
Trout are here abundant, both the native and the Eastern brook trout, which has 
been introduced. The suckers, and minnows are the same as at Hartsel’s. The species 
taken at Morrison are marked M. 
4. Middle Boulder Greelc, above Boulder. — Examined at various places in Boulder 
canon to a point 12 miles above Boulder. A swift, clear, very cold (54°) mountain 
stream, full of rapids and deep pools. The bottom is everywhere made up of boulders, 
so that a net could not be used. It is said that trout are abundant in the upper iiart 
of the canon, and that the fishing is especially good in the mountain pastures above 
the top of the canon. The only fishes taken were young suckers, marked B in the 
following list : 
FISHES OF THE PLATTE BASIN. 
1. Gatostomus teres sucklii (Girard). D. 
Abundant at Denver. 
2. Gatostomus griseus (Girard). D., H., B., M. 
Abundant everywhere, but especially so in the upper courses of the streams. D. 
10. Scales 102. About six rows of tubercles on upper lip. Dorsal not nearer base 
of caudal than snout, except in the larger specimens. Lower lip with a slight cartilag- 
inous sheath. Body long and low, dusky above, paler below. As already noticed in 
a paper on the fishes of the Yellowstone Park, this species seems to be the same as 
Acomm lactarius Girard and Gatostomus retropiwwis Jordan. It appears to differ from 
G. catostomus (Forster) in the greater number of rows of tubercles on the upper lip and 
in the greater inequalities of the scales on the body. But our specimens of G. catosto- 
mus are not numerous enough to test fully the value of these characters, and further 
study may show that this form intergrades with the other. 
