118 ICHTHYOLOGIA OHIENSIS 



Diameter one fifth of the length: blackish above, 

 yellowish beneath, very broad : a spine at the base 

 of the pectoral fins : lateral line straight. 



\6o\ A very doubtful species seen by Mr. Audubon. 

 It comes sometimes in shoals in March, and soon dis- 

 appears. Only taken with the seine, not biting at 

 the hook ; vulgar name Brown Sucker. The mouth 

 is very remarkable, being broader than the head, 

 somewhat projecting on the sides. Length one foot. 

 The head resembles that of the Cat-fish, but has no 

 barbs. Is it a peculiar genus owing to the mouth 

 and pectoral spine? It might be called Eurystomus. 

 The yellow colour covers the forehead and reaches 

 to the anal fin. Dorsal opposed to the abdominal and 

 trapezoidal, pectorals elliptical yellow. 



5th Subgenus. Decactylus. 



Body nearly cylindrical, abdominal fins with 10 

 rays : tail equally forked. 



Besides the two following species, the C. bostonien- 

 sis and C. hudsonius, must be enumerated here. 



66th. Species. Pittsburgh Sucker. Catostomus 

 duquesni. Catostome duquesne. 



Diameter one fifth of the length, whitish ; lateral 

 line curved towards the back : anal fin with nine rays 

 extending to the tail: dorsal with 14 rays and trape- 

 zoidal. 



C. duquesni Lesueur J. Ac. Nat. Sc. v. 1, p. 105. 



This species has been pretty well described by Le- 

 sueur: see his description. Length from 15 to 20 

 inches : good to eat, found in the Ohio as far as Pitts- 

 burgh : vulgar name White Sucker. 



67th Species. LONG SUCKER. Catostomus elongatas. 

 Catostomus allonge. 



