34 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY 1. 



ate between this subgenus and the foregoing, having 9 abdominal rays, 

 but an unequally bilobed tail." — (Raf.) 



55th species, Brown Buffalo-Pish, CATOSTOMUS BUB ALUS, Catostome 

 bubale. (p. 55.) 



ICHTHYOBUS BUBALUS (Raf.) Ag. 



Description passable. 



* 56th species, Black Buffalo-Fish, CATOSTOMUS NIGER, Catostome noir. 



(p. r)6.) 



? BUBALICHTIIYS NIGER (Raf.) Ag. 



Description insnfiQcieut. 



3d subgenus, CARPIODES. (p. 56.) 

 Carpiodes Agassiz and authors. 



"The G. cyprinus and C. setosus of Le Sueur belong to this subgenus." — 

 (Raf.) 



t57th species, Olive Carp-Sucker, CATOSTOMUS CARPIO, Catostome 

 carpe. (p. 56.) 



Carpiodes carpio Raf. 

 Carpiodes nummifer Cope. 



This description apparently refers to the species lately called C. num- 

 mifer by Professor Cope. I therefore adopt Rafinesque's specific name. 



58th species, Sailing-Sucker, CATOSTOMUS VSLIFER, Catostome volant. 



(p. 56.) 



Carpiodes velifer (Raf.) Ag. 

 A fair description. 



{ 59th species, Mud-Sucker, CATOSTOMUS XANTHOPUS, Catostome 

 santhope. (p. 57.) 



Hypentelium nigricans (Le S.) Jor. 



It is possible that this description was intended for the Cat. nigricans 

 LeS., but the latter is certainly not a " mud-fish", as Professor Agassiz 



* Entirely black, lateral liue straight. 



I have not seen this fisii. Mr. Audubon flescribes it as a peculiar species, found in 

 the Mississippi and the lower part of the Ohio, being entirely similar to the common 

 Bnffalo-fish, but larger, weighing sometimes upwards of 50 pounds, and living in sep- 

 arate shoals. 



t Diameter one-fourth of the length; olivaceous above, pale beneath, chin white, 

 abdomen bluish ; lateral line straight, dorsal fiu somewhat falcated with 36 rays, and 

 trapezoidal with 10 rays ; head sloping, snout rounded. 



Seen at the falls of the Ohio ; commonly called Carp. Length from one to two 

 feet. Eyes very small and black ; fins olivaceous brown, the pectorals olivaceous, tra- 

 pc2odial, short, and with 16 rays. Tail with 24. Dorsal fin beginning before the ab- 

 domin-il atid reaching the end of the anal fin. Not so good to eat as the Buffalo-fish. 



} Diameter one-fourth of the length; lateral line straight; silvery, back olivaceous. 



