62 Proceedings of the Biological Society of Washington. 



Susquehanna basin in Berks, Blair, Cameron, Columbia, Chester, Center, 

 Cumberland, Dauphin, Huntingdon, Lackawanna, Lancaster, Lebanon, 

 Luzerne, Mifflin, Perry, Potter, Snyder, Sullivan and York Counties. 



Potomac basin in Fulton County. 



Genesee basin in Potter County. 



Ohio basin in Beaver, Fayette, Indiana, McKean, Potter. Somerset, 

 Warren and Westmoreland Counties. 



Rhinichthys bowersi Goldsborough and Clark, 1 from the Ohio basin of 

 West Virginia appears only a local variety. A number of specimens from 

 many of the above listed districts show even greater ranges of variation, 

 with many details in extremes of other characters in combination. The 

 fact of the lesser row of teeth, for instance, being absent or consisting only 

 of a single tooth is a very variable condition. 



Hybopsis dissimilis (Rutland). Spotted Chub. 



Cope's material from the Monongahela and Youghiogheny Rivers ex- 

 amined. 



Hybopsis storerianus (Kirtland). Storer's Chub. 

 Evermann and Bollman report it from the Monongahela. 2 



Hybopsis kentuckiensis (Rafinesque). Horned Chub. 



Elk basin in Chester County. 



Susquehanna basin in Berks, Cameron, Center, Dauphin, Lancaster, 

 Lebanon, Perry, Snyder, Susquehanna and York Counties. 



Ohio basin in Beaver, Fayette, Indiana, Lawrence, McKean, Warren 

 and Westmoreland Counties. 



No definite record has been given for the Delaware, where it likely does 

 not occur. Possibly H. dissimilis Ross is the present species. 



Exoglossum maxillingua (Le Sueur). Cut-lips. 



Delaware basin in Berks, Bucks, Chester, Delaware and Montgomery 

 Counties. 



Elk basin in Chester County. 



Susquehanna basin in Berks, Blair, Cameron, Center, Columbia, Cum- 

 berland, Dauphin, Juniata, Lancaster, Lebanon, Luzerne, Snyder, Sullivan 

 and York Counties. 



Ohio basin in McKean County. 



CATOSTOMIDiE. 



Cycleptus elongatus (Le Sueur). Black-horse. 



Mentioned by Rafinesque in the Ohio as far as Pittsburgh, 3 and Cope 

 reports it from the Allegheny. An example obtained by Cope from the 

 Kiskiminitas River is doubtless partly the basis of his record and the only 

 one from our limits I examined. 



iBull. Bur. Fisher., XXVII, 1907 (March 14, 1908), p. 36, fig. 

 2Ann. N. Y. Acad. Sci., Ill, 1883-5 (1S86), p. 339. 

 sichth. Ohien., 1820, p. 60. 



