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y e? PO 4F EXPLORATIONS IN COLORADO AND UTAH DURING THE SUS - 3 t`E OF-1b89, WITH AN ACCOUNT OF THE FISHES FOUND IN EACH OF THE RIVER BASINS EXAMINEIl. - - BY DAVID STARR JORDAN. [Plates I to-V.I - - - -' _- INTRODUCTION. ffnde file-inatraction of the U. S. Commissioner of Fish and Fisheries, Hon. Mar- liall.MhIIOidald the writer undertook to make a series of esaminationsof the different \ treat _ofCoIQrado and Utah. This examination had two general purposes: First, to seerb the general character of the streams of the Rocky Mountains and the Great lases, theresent stock of food-fishes, and their suitability for the introduction of PMiW4ofr w. found there; second, to catalogue the fishes native to each stream, hathet f4$shes or not, in order to increase oar knowledge of the geographical dis an oih species and to throw further light on the laws which govern geograph dispriuioii. _ present paper is given an account of each stream, a list of the fishes found in tdusneh notes, geographical or economic, as avid to our knowledge of it. `(0e work.of the summer the writer had the very efficient help of his stadents, o ,W.-Evermana of the Indiana State Normal School at Terre Haute, bfr. ett Nesl-or of Topeka, Kans., and Mr. Bradley M. Davis of Chicago, Ill. The prose- euttono£the work was also materially aided by the -help given by Mr. Richard Rathbun, assistant' in charge of the work of scientific inquiry in the U. S. Fish Commission. We were also-much indebted to several citizens of the regions visited for the interest they showed-in our work anti the help rendered by them. Of these we may mention es- peaally Mr. George R. Fisher of Leadville, Hon. Gordon .Land, fish commissioner of Colorado, AIr. Peter Madsen of Provo, Utah, and Mr. J. F. Brown of Blake City, Utah. Efficient 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'a Hot Sprints, in the South Park. South Platte River, at Denver. Bear Creek, at Morrison. Boulder Creek, above Boulder. - -Bull. U. S. F. C. 89-, ! a Y?: