44 UNIVERSITY OF COLORADO STUDIES 



and Republican drainages are quite similar in having larger eyes it may be shown 



by the examination of large series from the upper Arkansas that this subspecies 



is valid for that drainage. Hyhognathus nuchalis placita (Girard) was described 



from the Arkansas River at Ft. Makee, in 1856, under the name of Hyhognathus 



placitus Girard.^ 



TABLE III 



Diameter of the Eye in the Length of the Head 

 Locality 38 3 9 4° 4 i 42 4.3 4.4 4-5 4-6 



Lodgepole Creek . 

 St. Vrain Creek . . 

 Republican River. 



Canyon City 



Cripple Creek. . . . 



6 



Total . 



The Silvery Minnow is quite abundant in the plains streams of eastern Colo- 

 rado where it is taken in company with Pimephales promelas, Notropis scylla and 

 Catostomus commersonii sucklii. Like that of the other herbivorous Cyprinids, its 

 food consists of the shme and water-logged material at the bottom of the stream. 

 This species is occasionally used as live bait but is not so valuable for that pur- 

 pose as some of the other more hardy Cyprinids. Large individuals are often 

 eaten. 



Hyhognathus nuchalis ranges from the east coast through southern United 

 States west to the Rocky Mountains and north through the Mississippi Valley to 

 the Red River of the North. 



Colorado specimens. — University Museum: Boulder Creek, Boulder, September and October, 

 1903 (3 specimens, 45-55 mm.), C. Juday and J. Henderson, No. 24; St. Vrain Creek, Longmont, 

 October 17, 1903 (85 mm.), C. Juday and D. W. Spangler, No. 17; South Platte River, Julesburg, 

 July 19, 1912 (12 specimens, 70-100 mm.), J. Henderson and M. M. Ellis, No. 342; Lodgepole 

 Creek near Ovid, July 20, 1912 (57 specimens, 65-95 mm.), J. Henderson and M. M. Ellis, No. 343; 

 Boulder Creek 6 miles east of Boulder, July 25, 1912 (38 specimens, 50-75 mm.), M. M. Ellis, No. 

 344; Republican River, Wray, October 26, 1912 (161 specimens, 35-80 mm.), A. G. Vestal and 

 M. M. Ellis, No. 345; 4 miles west of Cripple Creek, July, 1913 (80 mm.), F. A. Hassenpflug, No. 

 346; Sells Lake, Canyon City, September, 1913 (2 specimens, 50-60 mm.), F. A. Reidel, No. 347; 

 Colorado Stale Historical and Natural History Museum: Clear Creek near Denver, August 7, 1900 

 (150 mm.), W. C. Ferril; State Teachers' College Museum: Greeley, A. E. Beardsley. 



Subfamily Leuciscinae 



To this subfamily belong all of the species of carnivorous Cyprinids found in 

 Colorado. Most of them are small forms represented by large numbers of indi- 

 viduals in the small plains streams of eastern Colorado. One species is found in 

 the Rio Grande drainage and three west of the Continental Divide in Colorado. 

 One of these western slope species is the enormous "White Salmon." 



' Proc. Acad. Nat. Sci. Phila., p. 182, 1856. 



