FISHES 75 



di No caudal spot present. 



Ci Anal fin with 9 rays; in Iowa and Colorado N. gilberli. 



62 Anal fin with 8 rays. 



fi In Texas N. nocomis. 



{•2 From Lake Erie to Arkansas N. illecebrosus. 



es Anal fin with 7 rays; Ohio basin and Iowa N. shumardi. 



do A black caudal spot present; eastern and central 



States N. hudsonius. 



C2 Scales deeper than long and closely imbricated; in the 

 south, southwest and west. 

 di Rays of anal fin 7 to 9. 



Ci Dorsal fin without large black blotch. 



fi No black spot at base of tail fin; in Kansas 

 and southwestwards. 



gi Body short; back arched N. hubalinus. 



go Body long and slender; back not arched. .N. macrostomus. 

 ii A black spot at base of tail fin; in Texas. 



gi Rays of anal fin 8 N. texanus. 



g2 Rays of anal fin 7 N. notatus. 



62 Dorsal fin with a large black blotch. 



fi A black blotch at base of tail fin; on the Gulf 

 slope, 

 gi Fins of male without red. 



hi Scales in lateral line 42 to 44 N. stigmaturus. 



ho Scales in lateral line 37 to 39 N. cercostigma. 



g2 Fins of male reddish. 



hi Scales in lateral line 42 N. trichroistiiis. 



h2 Scales in lateral line 40 N. callistius. 



hs Scales in lateral line 39 N. eurystomus. 



i-i No black blotch at base of tail fin. 

 gi Rays of anal fin 8. 



hi In the Alabama basin N. ccer ulcus. 



h.2 In the eastern and central States N. whipplii. 



hs In the south-central States N. galacturus. 



go Rays of anal fin 9; in the Arkansas River 



basin N . caniurus. 



do Rays of anal fin 10 to 11 ; in the southeastern States, 

 ei A dark spot at base of tail fin. 



fi Rays of anal fin 10 N. xmiurus. 



f 2 Rays of anal fin 1 1 N. hypselopterus. 



€2 No dark spot at base of tail fin A^, pyrrhomelus. 



ho Teeth 2, 4-4, 2. 



Ci Rays of anal fin 7 to 10; mostly in the southeastern States, 

 di Scales mostly closely imbricated and crowded, 

 ei Dorsal fin over the ventrals; size large. 



fi In the eastern and central States N. cornutus. 



i-2 In Virginia N. cerasinus. 



N . albeolus. 



