FISHES OF COLORADO 63 



Pogonichthys communis Girard — Cope and Yarrow, Wheeler Survey, Vol. V, p. 653, 1S75 

 (Pueblo). 



Body rather elongate, compressed to somewhat fusiform; depth 4 to 4.6 

 in the length to the base of the caudal; head rather broad, slightly flattened 

 dorsally, in males with fine tubercles; length of the head 4. 3 to 4. 6 in the length; 

 dorsal and ventral profiles sloping evenly to the tip of the snout; snout broad and 

 blunt, but slightly overhanging the mouth, length of the snout 3 in the head; 

 eye moderately large and prominent, its center nearer to the tip of the snout 

 than to the posterior margin of the operculum, its diameter 4. 8 to 5 . 5 in the head, 

 1.5 or a little more in the snout, about 2 in the interorbital distance; nostrils 

 prominent, double, situated less than half the diameter of the eye directly in front 

 of the eye, each divided by a broad vertical septum, the anterior chamber circular 

 in outline and larger than the posterior; mouth ventral, slightly oblique, angle 

 of the mouth reaching almost or distinctly to the level of the eye; barbel in the 

 axil just posterior to the angle of the mouth, prominent, its length 2 in the diameter 

 of the eye; lips fleshy but not sucker-like; premaxillaries protractile; dorsal 

 fin short and rather high, length of its base about i . 5 in the length of its longest 

 ray, posterior margin distinctly but not deeply emarginate, base of the first ray 

 on a level with or slightly in front of the ventrals; pectorals large, length equal 

 to or slightly exceeding that of the head, posterior margin more or less emarginate 

 at the tip, tip of the pectorals not reaching the ventrals; length of the ventrals 

 1 . 5 in the pectorals, ventrals barely if at all reaching the anal opening; anal 

 small, of 7, usually 8 rays, slightly emarginate; caudal peduncle broad, its least 

 depth about 2 in the head; caudal rather deeply forked; scales large, 5 to 7, 



50-65- 4. 



Color above the lateral line olivaceous, below cream color to silvery white; 

 an indistinct lead gray lateral stripe extending from the posterior margin of the 

 operculum along the lateral line to the base of the caudal; no caudal spot; sides 

 somewhat silvery, upper half of the sides sprinkled with minute blue-black dots; 

 fins hyaline, rays, especially those of the caudal, outlined with dusky; top of the 

 head dark. Size small; length to 6 inches. 



Colorado specimens. — V niversity M useum: Arkansas River, Salida, May 8, (165 mm.), No. 

 376; Sells Lake, Canyon City, September, 1913 (2 specimens, 75-125 mm.), F. A. Reidel, No. 377; 

 Grape Creek near Canyon City, November 8, 1913 (120 mm.), A. G. Vestal and M. M. Ellis, 

 No. 378; reported very abundant at Salida by Cockerell. 



Genus RHINICHTHYS Agassiz 

 The Black-nosed Dace 



Rhinichthys Agassiz, Lake Superior, p. 353, 1850. 



Body elongate, fusiform, very slightly compressed; head rather long and 

 conical; mouth small, ventral and sucker-like; premaxillaries not protractile, 

 the upper lip being continuous with the skin of the top of the head, forming a 



