74 VERTEBRATE ANIMALS OF THE UNITED STATES 



C. vigilax (Baird & Girard). Bullhead minnow. Length 75 mm.; 

 head 4.25; depth 4.5; color dusky olive or yellowish with a dark lateral 

 band which terminates with a black spot; dorsal fin with 8 rays, on 

 each of which is a black spot; anal rays 7; scales 8-42-6, 28 before the 

 dorsal: Ohio to Iowa, southward to Georgia and Texas; very common. 



23. Notropis Rafinesque. Shiners. Body elongate or oblong, more 

 or less compressed; teeth in i or 2 rows, the main row 4-4, usually hooked; 

 rays of dorsal fin mostly 8; anal 7 or 8; no barbels; lateral line usually 

 complete; dorsal fin above or behind the ventrals; size small; tail deeply 

 forked; coloration silvery, often with reds and blues: about 100 species, 

 all in North American and in the eastern and central States; small, 

 often brightly colored fishes which abound in every clear brook, espe- 

 cially in the southern States. 



Key to the Species of Notropis 



Hi Teeth in i row, 4-4; in the eastern and north-central States, 

 bi In the Atlantic States. 

 Ci On the Atlantic slope. 



di Lateral line very short; Massachusetts to Maryland. A'^. bifrenatus. 

 d2 Lateral line complete; Delaware River to the Neuse.A". procne. 



ds In Florida N. welaka. 



C2 In the Ohio River basin. 



di Without a black spot at the base of the tail fin N. kanawha. 



d-i Conspicuous black spot at base of tail fin N. spectruncuhis. 



h-i In the central States. 



Ci Lateral line usually more or less incomplete, New York 

 and westwards, 

 di Dark caudal spot present. 



ei Chin black N. anogenus. 



62 Chin pale N. cayuga. 



d.2 No caudal spot present N. heterodon. 



Co Lateral line complete. 



di Scales not deeper than long or closely imbricated. 

 Ci No black caudal spot; in the central States. 



fi Mouth horizontal A'', blennius. 



U Mouth somewhat oblique A", scylla. 



e2 A small caudal spot; South Dakota and south- 

 wards N. topeka. 



di Scales deeper than long and closely imbricated A", lutrensis. 



a.2 Teeth in 2 rows, either i, 4-4, i or 2, 4-4, 2. 



bi Teeth i, 4-4, i; mostly in the southern and south-central 

 States. 

 Ci Scales usually not closely imbricated or deeper than 

 long; in the central States. 



