24 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
about 12 feet wide and 1 to 4 feet deep. Temperature 68°. No fishes were obtained 
with the .net. 
10. Gunnison Eiver, at Delta, Colo. — At Delta, some distance below the Black 
Canon, the Gunnison is a large stream 3 to 4 rods wide and 2 to 5 deep, the waters 
clear and of a summer temperature of about 72°. Its current is swift, and in its broad 
channel are many islands. The bottom is gravelly or sandy, and in still places occa- 
sionally muddy. The fishes here are the “ Eazor-back ” or “ Hump back sucker ” 
{Xyrauclien cypho), the “Flannel-mouth sucker” (Catos/omMs Intipinnis), the “Blue- 
head sucker” [Pantosteus delphimts), the “ Bony-tail ” {Gila elegans), the “ Kound-tail ” 
{Gila robusta), the “White Salmon” (Ptyc/mc/milus iiiciws), the “Bull-head” {Coitus 
bairdi punctulatus) and the miunow {Agosia yarrowi). 
11. Uncompahgre River. — This stream rises in the wild Uncompahgre Pass, above 
Ouray. In its upper course, it has few or no fishes, for it flows through wild and 
deep ravines with many cascades. Besides this, it has iron springs among its feeders, 
and trout seldom or never live in iron waters. Above Ouray, are some hot springs, 
and at Ouray stamp-mills render the water im])ure. Below Ouray are some trout, 
but probably not many. 
Between Ouray and Montrose, the stream leaves the mountains, and from Mont- 
rose to its mouth at Delta, it is very sluggish and its waters are largely drawn off by 
the irrigating ditches. The iilain is largely alkaline, and the banks of the stream are 
lined with greasewood {Sarcobatus vermiculatus), the sure indication of an alkaline soil. 
At Delta the only water left is from the seeijage of ditches. This is grayish yellow, 
and forms a succession of pools with bottom of gravel or mud, some of them 6 or 6 feet 
deep. Temperature 78°. The water is full of fishes of the species enumerated above 
as found in the Gunnison. Gila elegans, Agosia, and Coitus were not seen in the Un- 
compahgre. On the other hand, a single specimen of what seems to be a new species 
of Xyrauclien was taken in the little pond close to the station at Delta. 
12. Green River, at Blake City (Green Kiver Station), Utah. — At this point the 
river flows through a barren desert, its course largely bounded by high cliffs. Its 
waters are yellow, and except on certain rocky shallows deej) and sluggish. At low 
water the river is about 500 feet wide and 3 to 8 feet deep. In August the water was 
moderately clear, but at the time of the spring floods it becomes a paste of red mud. 
TVe seined the stream along the west side from the railroad bridge to the foot of the 
shallows about oue-fourth mile below. Xyrauclien cypho is very abundant, reaching 
a weight of 10 pounds, and is a good food-fish. Catostonms latiinmiis reaches 3 to 5 
pounds. Besides these we obtained Gila elegans, a small fish regarded as worthless 
because full of bones. The trout do not descend Green River much if any below the 
boundary of Wyoming Territory. 
13. Price River flows into the Green River from the west. It rises near the sum- 
mit of the Wahsatch range. It soon becomes gray and muddy and when it strikes 
the desert at the eastern foot of the mountains its waters are all used for irrigatiou. 
Although a long river, its waters are nearly all lost in summer, and it is worthless for 
fish. It is said that trout occur in some ponds on the eastern slope of the Wahsatch. 
14. Sail Juan River. — The San Juan is one of the chief tributaries of the Colorado, 
having its source in a considerable number of large, clear mountain streams, which 
head in the mountains of southwestern Colorado (Sierra San Juan, etc.), to the west of 
