64 Proceedings of the Biological Society of Washington. 



Indiana, McKean, Somerset, Venango, Warren and Westmoreland 

 Counties. 



Erie basin in Erie County. 



Catostomus nigricans Le Sueur. Black Sucker. 



Delaware basin in Lehigh County, likely introduced? 



Elk basin in Chester County. 



Susquehanna basin in Berks, Blair, Cameron, Chester, Dauphin, Lan- 

 caster, Lebanon, Mifflin, Perry, Snyder and York Counties. 



Ohio basin in Beaver, Clarion, Indiana, Lawrence, Warren and West- 

 moreland Counties. 



Erimyzon sucetta oblongus (Mitchill). Chub Sucker. 



Delaware basin in Berks, Bucks, Chester, Delaware, Lehigh, Mont- 

 gomery, Northampton and Philadelphia Counties. 



Susquehanna basin in Blair, Cameron, Center, Columbia, Cumberland, 

 Dauphin, Lancaster, Mifflin, Sullivan and York Counties. 



Erie basin in Erie County. 



Moxostoma anisurum (Rafinesque). White-nose Red-horse. 



The original account by Rafinesque' mentions it from the Ohio and large 



streams far as Pittsburgh. Cope later describes it from the Youghiogheny 



River, 2 and these types, together with Beaver River material, I have 



examined. McConnell has reported it from Jamestown in Mercer County.^ 



Moxostoma aureolum Le Sueur. Red-horse. 

 Ohio basin in Beaver, Indiana and Westmoreland Counties. 

 Erie basin in Erie County. 



Moxostoma macrolepidotum (Le Sueur). Eastern Red-horse. 

 Delaware basin in Philadelphia County, where rare. 

 Susquehanna basin in Cumberland, Lancaster and York Counties. 



Moxostoma breviceps (Cope). Long-tailed Red-horse. 

 The type from the Youghiogheny and Erie examples examined. 



Moxostoma duquesnii (Le Sueur). Fine-scaled Red-horse. 

 Le Sueur originally had it from the Ohio at Pittsburgh.^ Cope obtained 

 an example in the Youghiogheny and one in the Beaver River in 1880. 

 These and a small example from Indiana County constitute my material. 



Placopharynx carinatus Cope. Big-toothed Sucker. 

 Giinther records it from the Youghiogheny^ and I have Cope's Beaver 

 River material. 



ilch. Ohien., 1820, p. 54. 



iPiychostomus velatus Cope, Proc. Amer. Philos. Soc, XI, 1870, p. 470. 



3Rep. Com. Fisher. Pa., 1905 p. 178. 



*Catostomus duquesnii Le Sueur, Journ. Acad. Nat. Sci. Phila., I, 1817, p. 105. 



6A8 C. duquesnii (non Le Sueur) Giinther, Cat. Fish. Brit. Mus., VII, 1868, p. 18. 



