FISHES OF MINNESOTA 33 



Genus NOTROPIS Eafinesque. 

 KEY TO THE SPECIES OF NOTROPIS. 



A. Pharyngeal teeth 4-4; 1, 4-4, 0; orl, 4-4, 1; rarely two teeth in 

 one or both of the inner rows. 

 B. Scales not closely overlapping each other, their exposed 

 surface not wider than long; no black spot on the dorsal fin. 

 C. Pharyngeal teeth generally one rowed, 4-4; rarely 2, 

 4-4, fiia N. helerodon. 

 D. Lateral line usually more or less incomplete, not 

 always so; a dark lateral band usually present. 

 Small fishes. 

 E. Snout blunt; lower jaw not projecting beyond 



the upper; mouth small; chin black. anogenus, 34 



EE. ?nout pointed; lower jaw projecting. 



F. Chin not black; mouth very small. cayuga, 34 



FF. Chin black, mouth moderate. heterodon, 34 



DD. Lateral line always complete and with less than 40 

 scales; teeth 4-4, well hooked; 12 to 15 scales 

 before the dorsal; no spot at the base of the caudal 



fin blennius, 35 



CC. Black spot on the base of the caudal fin ; pharyngeal teeth 

 two rowed, 1, 4-4, 0; 1, 4-4, 1; or 1 or 2, 4-4, 1 or 2. 

 Head short, contained 4 to 5 times in the body; large 



for minnows hudsonius, 35 



BB. Scales closely overlapping each other, their exposed surfaces 

 broader than long, especially on the sides of the body; body 

 considerably compressed; a black blotch on the posterior 

 rays of the dorsal fin in adult specimens. . . . wliipplii» 36 

 AA. Pharyngeal teeth 2, 4-4, 2. 



B. Anal fins short, with 7 to 9 developed rays. 



C. Scales closely overlapping each other, the exposed sur- 

 faces much broader than long; grinding surface of 

 the teeth develo}>ed; individuals reaching 5 to 8 

 inches in length when mature. . cornutus, 36 



CC. Scales not closely overlapping each other; pharyngeal 

 teeth without the grinding surface developed; species 



of small size jejunus, 37 



BB. Anal fin long with 11 to 12 rays; dorsal inserted behind the 

 ventrals; parts sometimes colored red. 

 C. No black spot at the base of the caudal fin; scales not 

 closely overlapping each other; usually 5 to 7 scales 

 above the lateral line; fins often with red. 



attaerinoldes, 37; dilectus, 37; rubrifrons, 38 

 CC. Usually a dark spot on the dorsal fin; scales above the 

 lateral line 7 to 10; scales closely overlapping each 

 other, their exposed surfaces broader than long; a 

 black spot at the base of the dorsal fin. . uinbratilis, 38 



