6 UNIVERSITY OF COLORADO STUDIES 



an effort has been made to give a list of all published references to 

 Colorado fishes which are based on specimen records. 



Since fishes are difficult to collect and to transport, unless the 

 party be especially prepared for such work, few specimens of fishes 

 were taken by the early surveys as compared with reptiles and amphib- 

 ians. The first collections of Colorado fishes reported upon were 

 those made as part of the Wheeler Survey during the years 1872 to 

 1874. The specimens were studied by Cope and Yarrow. In 1889 

 Jordan and Evermann made collections in Colorado for the United 

 States Fish Commission, pubhshing a report in 189 1. The only 

 local list of Colorado fishes was prepared by Juday in 1903 from speci- 

 mens collected at Boulder and Longmont. In 1908 Cockerell com- 

 piled a list of the fishes of the Rocky Mountain region. Other records 

 are cited under the particular species. 



The writer wishes to express his thanks to the following persons 

 who have materially aided this work: Professor Junius Henderson, 

 curator of the Museum, Professor Francis Ramaley, Professor T. D. 

 A. Cockerell, and Mr. Arthur G. Vestal, of the University of Colorado 

 for their generous assistance both at the University and in the field; 

 Colonel James A. Shinn, state commissioner of game and fish, for 

 co-operation from his office; Messrs. Harold E. Robbins, Howell 

 Ellis, Walter Reed, Stuart Way, and Russell Wells for assistance in 

 collecting and seining; Professor A. E. Beardsley of the State Teach- 

 ers' College, Professor E. Bethel of the East Denver High School, 

 Messrs. J. C. Smiley and H. G. Smith of the Colorado State Historical 

 and Natural History Museum, E. R. Warren and H. B. Baker of 

 Colorado College, and F. A. Riedel of Canyon City, for specimens 

 and records; Messrs. L. C. Paddock, state commissioner of immi- 

 gration, A. D. Parker of the Colorado and Southern Lines, and E. L. 

 Brown and Frank Wadleigh of the Denver and Rio Grande Railroad, 

 whose interest in this survey made part of the field work possible. 



Hydrography of Colorado 



Since fishes are aquatic animals, a general survey of the hydrog- 

 raphy of a given area is essential to the understanding of its fish 



