FISHES OF COLORADO 



6S 



maxillaries not protractile; frenum equal to the diameter of the eye; dorsal fin 

 rather short, the length of its longest ray greater than that of the base of the fin, 

 inserted in the posterior half of the body behind the origin of the ventrals, the 

 distance from the base of the first ray of the dorsal to the base of the caudal 

 equalling the distance from the base of the first ray to the nostril (Table IV) ; 

 dorsal rays 8, rarely 7; pectorals moderately large, larger in the males than in the 

 females, inserted low on each side, not reaching the ventrals; ventrals smaller 

 than the pectorals, not reaching the anal by the diameter of the eye or more; 

 anal of much the same size and shape as the dorsal, anal rays 7, rarely 8; caudal 

 moderately forked, its width when spread greater than the depth of the body; 

 scales small and closely imbricated, with both dorsal and apical radii, 11 to 14, 

 58-72, 9 to 12; lateral line complete, little if at all decurved. 



Locality 



South Platte Drainage — 



Boulder 



Cherry Creek 



West Plum Creek . . . . 

 Arkansas Drainage — 



Twin Lakes 



Canyon City 



Rio Grande Drainage — 



Alamosa 



Del Norte 



Creede 



Total 



TABLE IV 



No. of Specimens 



with Dorsal nearer 



Tip of Snout 



I (D.7; A.7) 



No. of Specimens 



with Dorsal Midway 



between Tip of Snout 



and Caudal 



No. of Specimens 



with Dorsal nearer 



Base of Caudal 



130 



I (D.8; A.8) 

 17 



167 



General color above greenish brown to dusky, mid-dorsal region with at least 

 the indication of a dusky stripe; sides lighter, especially in large specimens which 

 are often somewhat silvery, profusely spotted with dark brown, spots fewer below 

 the lateral line; body below the pectorals without markings, white, cream-colored, 

 yellowish, often with a pinkish cast; head dark, almost black above, lighter and 

 spotted on the sides, yellowish or pinkish below, a narrow black stripe usually 

 present extending from the tip of the snout to the anterior margin of the eye; in 

 small specimens continuing through the eye to the posterior margin of the oper- 

 culum, in very small specimens often continuing along the lateral line as a lateral 

 stripe; specimens of all sizes with a rather conspicuous caudal spot; rays of the 

 fins, especially of the dorsal and anal, usually outlined with black; males in the 

 spring with the lips and under parts of the head orange-red to crimson, bases of 

 the pectorals, ventrals and anal, and the small tubercles just above the origins 

 of the pectorals and ventrals, orange-red to vermilion, fins and entire ventral 

 portion of the body with more or less pink. Length of average specimens two 

 to four inches, maximum size about five and a quarter inches. 



