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<br />24 RULLF,TIN OF THE UNITED STATES FISH COMMISSION.
<br />about 12 feet, wide and 1 to 4 feet deep. Temperature GSO. To fishes were obtained
<br />with the net.
<br />10. Gunnison River, at Della, Colo.-At Delta, some distance below the Black
<br />Canon, the Gunnison is a large stream 3 to 4 rods wide and 2 to 5 deep, the waters
<br />clear and of a summer teniperatureof abont 720. Its cnrrent is swift, and in its broad
<br />channel are many islands. The bottom is gravelly or sandy, and in still places occa-
<br />sionally muddy. The fishes here are the !( Razor-Lack" or " Bump-back sucker n
<br />(tyra.uchen cypho), the "Flannel-moutb sucker" (Catoslwnus lafipinnis), the "Blue.
<br />bead sticker" (Paniosfeus delphinu.s), the " Pour-tail" (Gila eleflans), the cc Round-tail"
<br />j (Gila, robusta), the 11 White Salmon 17 (Plychocheilus lucius), the "Bull-bead" (Cotfus
<br />bairdi punctulatus) and the minnow (Agosia yarroiri).
<br />11. Uncompahgre River.-This stream rises in the wile] Uncrnupabgre Piss, above
<br />Ouray. In its upper course, it has few or no fishes, for it flows through wild and
<br />deep ravines with mane cascades. Besides this, it has iron springs among its feeders,
<br />and trout seldom or never lire in iron waters. Above Ouray, are some hot springs,
<br />and at Ouray stamp-mills render the water impure. Below Ouray are some trout,
<br />but probably not mane.
<br />Between Ouray and Montrose, the, stream leaves the mountains, and from ]Mont-
<br />rose to its mouth at. Delta, it.is very slat 6sh and its waters are largely drawn off by
<br />the irrigating ditches. The plain is largely alkaline, and the banks of the stream are
<br />]!tied with greasewood (Sarcobatus vermiculat us), the sure indication of an alkaline soil.
<br />At Delta the only water left is from the seepage of ditches. This is grayish yellow,
<br />and forms a succession of pools with bottom of gravel or mud,sonie of them 5 or Gfeet
<br />deep. Temperature X50. The water is full of fishes of the species enumerated above
<br />as found in the Gunnison. Gila elegau.s, Agosia, and Coffus were not seen in the Un-
<br />compahgre. On the other hand, a single specimen of what seems to be a new Species
<br />1 of %yrauchen was taken in the little pond close to the station at Delta.
<br />12. Green River, at Blake City (Gre.eu River Station), Utah.-At this point the
<br />river flows througb a barren desert, its course largely bounded by high cliffs. Its
<br />waters are yellow, and except on certain rock- shallows deep and sluggish. At low
<br />water the river is about 500 feet wide and 3 to S feet deep. In August the water was
<br />moderately clear, but at the time of the spring floods it becomes a paste of red rnud.
<br />We seined the stream along the west side from the railroad bridge to the foot of the
<br />shallows about one-fourtb mile below. Xyrauchcrc cypho is very abundant, reaching
<br />a weight of 10 pounds, and is a good food-fish. Cafo.,4onius la.tipinnis reaches 3 to 5
<br />pounds. Besides these we obtained Gila eleyan.., a small fish regarded as worthless
<br />because full of bones. The trout do not deceeud Greeu River much if any below the
<br />bouudary of Wyoming Territory.
<br />13. Price River flows into the Green River from the west. It rises near the sum-
<br />mit of the Wahsatch range. It soon becomes gray and muddy and when it striker,
<br />the desert at the eastern foot of the mountains its waters are all used for irrigation.
<br />Although a long river, its waters are nearly all lost in summer, and itis worthless for
<br />fish. It is said that trout occur in some ponds on the eastern slope of the Wahsatch.
<br />14. San Juan River.-The San Juan is one of the chief tributaries of the Colorado,
<br />having its source in a considerable number of large, clear mountain streams, which
<br />bead in the mountains of southwestern Colorado (Sierra San Juan, etc.), to the west of
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