FISHES OF COLORADO 25 



Colorado specimens. — University Museum: Boulder Creek near Boulder, October, 1903 (ii 

 specimens, 40-185 mm.), C. Juday and J. Henderson, No. 4; West Plum Creek near Castle Rock, 

 June 8, 1912 (170 specimens, 40-250 mm.), A. G. Vestal and M. M. Ellis, No. 309; South Platte, 

 Julesburg, July 19, 1912 (18 specimens, 35-55 mm.), J. Henderson and M. M. Ellis, No. 310; 

 Lodgepole Creek near Ovid, July 20, 1912 (25 specimens, 40-70 mm.), J. Henderson and M. M. 

 Ellis, No. 311; Boulder Creek 6 miles east of Boulder, July 25, 1912 (49 specimens, 30-170 mm.), 

 M. M. Ellis, No. 312; Boulder Creek near Boulder, August 10, 1912 (2 specimens, 250 and 300 

 mm.). No. 313; Republican River, Wray, October 25 and 26, 1912 (83 specimens, 40-300 mm.), 

 A. G. Vestal and M. M. Ellis, No. 314; Grape Creek near Canyon City, November 8, 1913 (2 

 specimens, 150-250 mm.), A. G. Vestal and M. M. Ellis, No. 315; Outlet to Sells Lake, Canyon 

 City, November 8, 1913 (3 specimens, 45-70 mm.), A. G. Vestal and M. M. Ellis, No. 316; State 

 Historical and Natural History Museum: South Platte River, Denver, August 3, 1900 (130 mm.), 

 W. C. Ferril; State Teachers^ College Museum: South Platte and Arkansas, A. E. Beardsley. 



Catostomus griseus (Girard) 

 Gray Sucker, Platte River Sucker, Fine-scaled Sucker (Fig. 6) 



Acomus griseus Girard, Proc. Acad. Nat. Sci. Phila., p. 174, 1856 (Sweetwater Fork of the 

 Platte River). 



Catostomus griseus (Girard) — Jordan, Bull. U.S. Fish Com., Vol. IX, p. 7 (Denver, Boulder, 

 Bear Creek above Morrison, Hartsel's Hot Springs, South Platte in South Park); Juday, Univ. 

 Colo. Studies, Vol. II, p. 113, 1903 (Longmont and Boulder); Juday, Bull. U.S. Fish Com. for 

 1904, p. 226, 1905 (Boulder; Longmont). 



Body elongate and rather fusiform, somewhat compressed in the caudal half; 

 depth 5 to 5 . 75 in the length to the base of the caudal fin ; head elongate, flattened 

 above, sides rounded, rather ovoid in cross-section, its length 4 to 4.25 in the 

 length of the body; both dorsal and ventral profiles rather straight, the mid- 

 dorsal region being but slightly arched; snout long, heavy and blunt, its tip being 

 half or more of the diameter of the eye beyond the margin of the upper lip; eye 

 small, nearer the gill opening than to the tip of the snout, its diameter 6 or more 

 in the head; interorbital distance 2.25 to 2.75 in the head, about 1.25 in the 

 snout; nostrils large and prominent; mouth ventral and rather broad, upper lip 

 with 5 to 8 rows of papiUae, median indentation of the lower lip reaching the 

 margin of the lower jaw or separated from it by but one row of papillae, maximum 

 length of the median free portion of the lower lip about 2 in the width of the lower 

 lip; distance from the middle of the lower jaw to the angle of the mouth greater 

 than the length of the free portion of the lower lip; mouth as a whole protractile; 

 dorsal fin short and rather high, its longest ray equal to or exceeding the length of 

 the base of the fin, of 10 or 11, sometimes 12 rays, the base of the first ray 

 being nearer to the tip of the snout than to the base of the caudal, or rarely midway 

 between them; pectorals not reaching the ventrals; ventrals barely if at all reach- 

 ing the anal opening; anal long, reaching to or beyond the base of the caudal, of 

 7 or 8 rays, the fourth being the longest, sides of the rays tubercled in breeding 

 males; scales small, crowded anteriorly, 14 to 16, 95-120, 13 or 14. 



Color above the lateral line dark blue or green to almost black, sides lighter; 

 below the lateral line the color fades rather abruptly into dirty white, ventral 



