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<br />26 BITIA ETIN OF TIM UNITED STATES FISi! COMMISSION.
<br />Brothers have a trout hatchery further ul) the river at. Los Pinos. Like the Animas,
<br />this; is an excellent, trout stream.
<br />20. lgnaeio Lab-c.c.--Near Los Pinos Riverare the San Ignacio Lakes,one of Go acres,
<br />one of 40 acres, at 8,000 feet elevation. They arv fe+l by springs and have no outlet.
<br />They have no fishes but. are said to be 11 fill of dog fish (.f mblycto is P) which devour
<br />the yonng trout which have been several times lrlacerl i11 the lakes." We were unable
<br />to verify this statement which was made by a citizen of Durango.
<br />21. Rio de las Pitdra.s, said to be the best trout stream in the San Juan basin, is
<br />! similar to Los Pinos, but smaller.
<br />22. Rio Narajo, which flows into the San Jnan near Juanita, is also similar; a
<br />clear stream with gravelly bof tom and wooded backs.
<br />23. Rio San Juan., )which receives the waters of all these, is, when crossed by the
<br />railroad at -Xi-boles, about the size of Los Tinos at Ignacio. Its water is warm and
<br />lint (mite clear; the bottom of gravel and stones. About Pa:gosa Springs, above Ar-
<br />boles, it is a trout stream. L'clow Arlklle.s it becomes very yellow, and at last it
<br />bears a volume of very muddy water into the Colorado.
<br />FISHES OF THE UPPER COLORADO BA91N.
<br />1. Catostomus latipinnis (Baird & Girard). Flarmd-raoufh Sacker. •
<br />Very COIDID011 in the. errand River at Glenwood Sllr•ings, in the Gunnison and
<br />Uncompahgre at Delta, and in Green River. It reaches a. length of 1.4 to 2 feet mid a
<br />weight of 3 to 5 ponuds. Dorsal rats usually 11, sowetimes 12 or even 13. Caudal
<br />lreduncle slender, aml the tins all high ; these characters especially marked in old
<br />males. Large specimens, in life blackish, olive above, abruptly- haler below; sides
<br />bright creamy orange, deepest on the tail ; snout and cheeks bale orange; bells pure
<br />white; lower fins all more or less orange; nplrer fns dusky olive, tipped with orange;
<br />pectoral dusky, orange above, creamy below; axil blackish; lips very thick and large.
<br />Feruale specimens have the same color, the only difference being that the male has the
<br />anal and lower lobe of caudal tuberculate. Stomach full of confervm'and other vege-
<br />t.1tiol).
<br />Calostomus diseobolus Cope, from Green River iu Wyoming, is probably based on
<br />the young; of Catostonllrs latipinnis. The. fishes from Idaho, formerly recorded by ire
<br />as Catostomus dlscobolus, are probably different.
<br />2. Syrauchen cypho (Lockin,,tou). I;rrcor-Lack,cuckrr; ')curb-bac1.•Surker. (Plate 117, Fig. 11.)
<br />This remarkable fish is Verb- abundant in the river channels of the Colorado Basin.
<br />It. reaches a, weight of 8 to 10 pounds, and is largely used for food. Specimens were
<br />take)) by us at Della, both in the. Gnnnisou and the Uncompahgre, and in Green River.
<br />Specimens of " inches have the depth equal to length, of head, 3-1 in length.
<br />Scales 13-722 73, or 74-13; D., 14. First dorsal ray, 1j in head; base of the fin, 17.
<br />Least depth of ca>udal l)ednnele, 3 in head ; 1 j in distance, from last anal to first cau-
<br />dal ray. Nuehal crest rnneb elevated, corumenciua by a. prominence close to the nape,
<br />and with no scales before it; uuchal crest nearly or quite naked on the median line.
<br />3. %yrauchen uncompahgre Jordan A-. E)•errnann, Fp. nog. (plate V, Fig. 12.)
<br />A single young specimen of Xyra)rchen, about 7 inches long, taken in the Uncom-
<br />pahgre River, close to the railway station at Delta, differs much from the others, and
<br />probably represents a distinct species of the same singular genus.
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