Fins whitish or yellowish; length four and three-quarters times the depth; 

 Gulf States 



Erogala cercostigma (Cope) Spotted Tail 

 (7\[ot?opis cercostigma (Cope) ) 



245. With a dark spot or bar on the dorsal fin 246. 

 Dorsal fin without a dark spot or bar 248. 



246. Base of tail fin yellow; south-central states 



Erogala galactura (Cope) 

 A[otropis galacturus (Cope) 

 Not so 247. 



247. Usually with nine anal rays; posterior half of dark lateral stripe about 



midway in depth; central states east of the Alleghenies 



Erogala analostana (Girard) Satinfin 



']\lotropis analostanus (Girard) 

 Usually with eight anal rays; posterior half of dark lateral stripe nearer 

 ventral outline; N. Y. to Minn., southward to Alabama and Arkansas 



Erogala whipplii (Girard) Steel-colored Minnow, Spot-fin 



Tsjotropis spilopterus (Cope) 



248. Depth of body over one-third the length; fins red; S. D. to Illinois and 



Texas 



Moniana lutrensis (B. & G) Redfin 

 l^lotropis lutrensis (B. &' G.) 

 Depth of body considerably less in proportion to length 249. 



249. Anal rays usually nine; Kansas to Texas 



Cypr]nella macrostoma Girard 

 (Tsjotropis macrostomus (Girard) ) 

 Anal rays usually eight 250. 



250. Mouth small, equal to the diameter of the eye; pharyngeal teeth 4-4; 



N. Y. to Texas 



Hyhopsis volucella (Cope) Mimic Shiner 

 Jslotropis volucellus (Cope) 

 Mouth larger; pharyngeal teeth 1-4-4-1; N. Y. to Colorado 

 Hvbopsis gilbert! (J. 6? M.) Bigmouth Shiner 

 l^lotropis dorsalis (Agassiz) 



251. Dorsal outline of head raised so that the eye is about equi-distant be 



tween the dorsal and ventral margins; color plain, pale; Rio Grande 

 Orcella orca (Woolman) 

 (]\lotropis orca Woolman) 

 Eye slightly nearer the dorsal than the ventral margin; color various 252. 



252. With 23 to 30 scales before the dorsal fin 253. 

 With less than 23 scales before the dorsal fin 256. 



253. Dorsal fin over pelvic fins; states east of the Rockies except the south 



Atlantic and Gulf states 



Luxilus cornutus (Mitchill) Northern Common Shiner 

 J\lotropis cornutus frontalis (Agassiz) 

 Dorsal fin behind area over pelvic fins 254. 



287 



