FAMILY CYPRINID.E CATOSTOMUS. 203 



Anal fin straight, long, and passing the base of the caudal fin. Caudal forked, with pointed 

 lobes. 



Color. Back dark blue ; base of the scales brown ; sides whitish, with yellow reflections. 

 Opercles yellowish. Head reddisli brown. Dorsal, anal and ventral tinged with blue and 

 yellow ; caudal greyish. 



Fin rays, D. 16 ; P. 18 ; V. 9 ; A. 9 ; C. 18 f. 



Mr. Lesueur has not given the dimensions of this very distinct species, which is found in 

 the River Delaware, and doubtless exists in this State. I have given a copy from Lesueur's 

 figure. He notices, in another place, that the figure of the dorsal fin is not always as much 

 excavated. In the males, according to Lesueur, the fin is obliquely truncated, and not hol- 

 lowed out. It appears to be a common species. 



(EXTRALIMITAL.) 



C. longirostris. (Lesueur, Ac. Sc. Vol. 1, p. 102.) Head flat, with a long snout. Scales small 



and rounded. Anal fin not touching the base of the caudal. D. 12 ; A. 7. Length five inches. 



Vermont. 

 C. maculosus. (Id. lb. p. 103.) Head large, quadrangular. Eyes small. Color reddish, with ir- 

 regular blotches of black. Lateral line straight, running in a line with the eye. Pharyngeal teeth 



hooked. A. 9. Length 8 inches. Maryland. An Var. nigricans ? 

 C. elongates. The Missouri Sucker, Black Horse and Black Buffalo. (Id. lb. p. 103.) Body very 



long. Dorsal as long as one-third of the body, with 32 rays. Length two feet. Ohio. 

 C vittatus. (Id.) A black stripe passes from the snout, through the eyes, to the caudal fins. Scales 



very small, rounded. Length 2 inches. Philadelphia. 

 C. duquesnii, The White Sucker. (Id.) Scales large, trilobate. Head one-fifth of the total length. 



Caudal deeply forked. Mouth wide. D. 14. Length 19 inches. Pittsburgh. 

 C. sucelta. (Lacepede.) Head compressed, flat. Lower lip very thick, crenated. Scales semi- 



rhomboidal. Sides silvery. D. 12; A. 9. Length one to two feet. South-Carolina. 

 C. mazilingua. The Little Sucker. (Lesueur, Ac. Sc. Vol. 1, p. 85.) Sides blue, with a brownish 



band. A black spot on the base of the caudal fin. Dorsal high. Caudal forked. D. 9 ; A. 9. 



Length four inches. Delaware. An juv. 1 

 C. sueuri. (Richardson, F. B. A.) Brilliant metallic colors. Scales very large. Air-bladder divided 



into three portions. D. 14; A. 9. Length 19 inches. Northern Regions. 

 C. forsterianus. Red Sucker. (Id. lb.) Scales broadly oblong, radiated. Dorsal higher than long, 



with 12 to 14 rays. Anal 8 or 9, not reaching to the base of the caudal. Length 22 inches. 



Northern Regions. 



