LIST OF FISHES COLLECTED IN BOULDER COUNTY, COLORADO, WITH 

 DESCRIPTION OF A NEW SPECIES OF LEUCISCUS. 



By CHANCEY JUDAY. 

 University of I 'olorado. 



Boulder County lies in the basin of South Platte River and is drained chiefly by 

 two streams. St. Yrain Creek and Boulder Creek, the latter becoming a tributary of 

 St. Yrain Creek before their waters reach South Platte River. The southern part 

 of the county is drained by Boulder Creek, which receives South. Middle, and North 

 forks in its upper course, these branches having their beginnings in the Arapahoe 

 and James Peak region; and the northern part by St. Vrain Creek, which has three 

 main branches in its upper course, North and South forks and Left Hand Creek, all 

 of which have their sources on the eastern slope of the high mountain country in 

 the western part of the county, on the south side of Longs Peak and in the region 

 south toward Arapahoe Peak. 



In September and October. 1903, some fishes were collected from these two 

 streams in their lower courses — that is, some distance below the foothill region in 

 Boulder (reek. The collections were made a few miles east of the city of Boulder; 

 in St. Vrain Creek, in the vicinity of Longmont; also, two species (Pomoxis sparoides 

 and Micropterus salmoides) were obtained from Culbertson's Lake, a small private 

 lake about 5 miles east of Boulder, into which they have been introduced. 



Trout are found in the mountain courses of these streams, "out no specimens 

 were obtained. So far as the writer has been able to determine, but a single species. 

 besides a mention of the trout, has been reported from the county before. Jordan 

 states that he found young Catostomus grist //■- in Boulder Creek in the canyon above 

 Boulder." Twenty-five species of fishes are represented in these collections. The 

 trout, of course, arc still to be added to the list, and there is no doubt that more 

 extensive collections would result in the addition of still other species. 



The writer wishes to acknowledge his indebtedness to Judge Junius Henderson, 

 of Boulder, and Prof. I). W. Spangler. of Longmont. for their valuable assistance in 

 making the collections. 



In the following list the letter "B" indicates the species found in Boulder 

 Creek and •■V" those found in St. Vrain Creek. 



'i Bull. C. S. Fish Com., Vol. IX pp. 1-36, 1889. 



B. B. F. 1WI4— 15 225 



