FISHES OF BOULDER COUNTY, COLORADO 



By Chancey Juday 



The following list of fishes is based on some collections made in 

 Boulder County during the months of September and October, 1903. 

 Collections were made in Boulder Creek about five miles east of the city 

 of Boulder and in St. Vrain Creek in the vicinity of Longmont. Also, 

 through the kindness of Dr. Place, we were enabled to obtain two 

 species of food fishes (Pomoxis sparoides and Micro pterus salmoides) 

 which have been introduced in Culbertson's Lake, a small private lake 

 about five miles east of Boulder. 



This list is incomplete, as specimens of the trout that inhabit the 

 mountain courses of the above streams have not been obtained as yet. 

 Indeed, it is not even presumed that all the species inhabiting these 

 streams in the regions where collections were made have yet been ob- 

 tained. One additional species at least has been reported from these 

 regions by local fishermen. Also there are several other streams and 

 lakes in the county in which collections have not been made. 



As far as the author has been able to determine, but a single species of 

 fish, besides a mention of the trout, has been reported from the County 

 before. Jordan (1889, p. 7) states that he found young Catostomus 

 griseus in Boulder Creek in the canon above Boulder. 1 So far, twenty- 

 five species have been found and as stated above, the list is still incom- 

 plete. This large number of species alone has been sufficient to make 

 the work very interesting for it was not supposed in the beginning that 

 nearly so many species would be found. This interest has been greatly 

 increased, however, by the fact that one species is new to science. 



The writer wishes to acknowledge his indebtedness to Judge Junius 

 Henderson, of Boulder, and Professor D. W. Spangler, of Longmont, 

 for their valuable assistance in making the collections. 



In the list, the letter B indicates that the species was found in the 

 vicinity of Boulder, and L in the vicinity of Longmont. The common 



' Bulletin, U. S. Fish Commission, Vol. IX (1889), pp. 1-36. 



113 



