76 VERTEBRATE ANIMALS OF THE UNITED STATES 



e2 Dorsal fin behind the ventrals. 



fi Lower jaw projecting; southern Alleghanies. 



gi Fins plain in color N. macdonaldi. 



g2 Upper half of dorsal and caudal fins dark.iV. coccogenis. 

 f) Lower jaw not projecting. 



gi No black at base of tail fin. 

 hi Rays of anal fin 9. 



ii In the Ozark region N. zonatus. 



i-i In the southern AUeghenies N. rubricroceus. 



h2 Rays of anal fin 10. 



ii In Georgia N. zonistus. 



io In Illinois N . pilshryi. 



hs Rays of anal fin 8; in the Carolinas. .N. chlorocephalus. 



N. lutipinnis. 

 g-.. A black spot at base of tail fin; in the 

 southern States. 



hi Rays of anal fin 8 N. chiliticus. 



N . chalyhcEtis. 

 N. chrosomiis. 



\\2 Rays of anal fin g N. altipinnis. 



hs Rays of anal fin 7 N . roscus. 



N . xcrnocephalus. 

 d2 Scales not closely imbricated; in the central States. 

 Ci Dorsal fin over the ventrals; no caudal spot. 



fi Rays of anal fin 9 N. ariommus. 



i% Rays of anal fin 7 N. jejunus. 



e2 Dorsal fin behind ventrals; a black caudal spot 



present N. leuciodus. 



C2 Rays of anal fin 1 1 or 1 2 ; dorsal fin behind ventrals. 

 di No black on dorsal fin. 



Ci Rays of anal fin 10 N. telescopus. 



N. siilhius. 

 N. rubifrons. 

 N. photogenis. 

 N. scepticus. 

 N. micropteryx. 



e2 Rays of anal fin 1 1 N. atherinoides. 



N. dilectus. 

 N. metallicus. 

 d2 A black spot present on dorsal fin. 



ei Spot indistinct, consisting of a few dots N. lints. 



e2 Spot distinct. 



fi Spot on upper portion of fin; in the Gulf 



States N. roseipinnis. 



f2 Spot at base of fin; in the central and south- 

 ern States N. umbratilis. 



N. bifrenatus (Cope). Length 50 mm.; head and depth 4.2; straw- 

 color, with a black lateral band bordered by orange on the snout; 



