4. Barbel at or near end of maxillary and always slender 



Lake Chub 

 Couesius flumbeus (Agasslz) 



Barbel on lower edge of maxillary well in advance of posterior end 

 usually concealed in groove between maxillary and premaxillary 

 and often flaplike and obsolescent 



Dorsal fin beginning over base of ventral finsj scales large, 45 in 

 lateral line and silvery 



Fallfish 

 Semotilus corforalis (Mitchill) 



Dorsal fin beginning just behind base of ventral finsj scales smaller, 

 about 50 in lateral line and little silver 6 



6. A black spot on dorsal fin near front of base, indistinct in young j 

 mouth large, upper jaw extending at least to below front of eyej 

 sides not mottled by specialized dark scales j scales in lateral line 

 fewer than 60 



Creek Chub 

 Semotilus atromaculatus (Mitchill) 



No black spot on dorsal finj mouth small, upper jaw not extending to 

 below front of eycj sides mottled by specialized dark scales j scales 

 in lateral line about 65-75 



Pearl Dace 



Margariscus margarita (Cope) 



7>S 



