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L-REPORT OF EXPLORATIONS IN COLORADO AND UTAH DURING THE SUX- HER OF mg, WITH AN ACCOUNT OF THE FISHES FOUND IN EACH OF THE RIVER BASINS EXAMINED. BY DAVID STARR JORDAN. [Plates I to V.] INTRODUCTION. Under the instructiuu of the U. S. Cou:Inissioner of Nish and Fisheries, lion. Alar- shall McDonald, the writer undertook to make-a series ofesaminatiousofthe different streams of Colorado and Utah. This examination had two general purposes : First, to ascertain the general character of the streams of the Pocky Mountains and the Great Basin, their present stock of food fishes, and their suitability for the introduction of species not now found there; second, to catalogue the fishes native to each stream, whether food-fishes or not, in order to increase our knowledge of the geographical dis- tribution of each species and to throw further light oil the laws which govern geograph- ical distribution. In the present paper is given an account of each stream, a list of the fishes found in it, and such notes, geographical or economic, as add to our knowledge of it. In the work of the summer the writer had the very efficient help of his Students, Prof. Barton W. E;vermanu of the Indiana, Stato Normal School at Terre Haute, Mr. Bert Fesler of Topeka, Kans., and Mr. Bradley M. Davis of Chic:igo, 111. The prose. cntionof the work was also materially aimed by the help given by 1[r. IPichard Rathbun, assistant in charge of the work of scientific inquiry in the U. S. Nish Commission. We were also much indebted to several citizens of the regions visited for the interest they showed in our work and the help rendered by them. Of these we may mention es- pecially Mr. George R. Fisher of Leadville, Hon. Gordon Laud, fish commissioner of Colorado, Mr. Peter Madsen of Provo, Utah, and Ar. J. F. Brown of Blake City, Utah. I•:flicient help was also rendered by Col. John Gay, assistant to the U. S. Fish Com- Mission, then in charge of the erection of the fish hatchery at Evergreen Lake, near Leadville. The streams examined may be grouped as follows: A•-Platte River: South Platte River, at Hartsel's [lot Springs, in the South Park. - South Platte River, at Denver. Bear Creek, at 'Morrison. Boulder Creek, above Boulder. Bull. U, S. F. C. 89-1 t