128 VERTEBRATE ANIMALS OF THE UNITED STATES 



C. cheneyi Evermann & Kendall. Length 50 mm.; head 4; depth 6; 

 color dark, with 8 or 9 large detached spots in the lateral hne; cheek 

 naked; rays of dorsal fins XI-12; anal II, 8; scales 7-56-6: northern New 

 York; rare. 



7. Ulocentra Jordan. Darters. Body elongate; head short and 

 thick; scales on belly like those on the sides; premaxillaries protractile; 

 ventral fins close together: 6 species, several rare. 



Fig. 57. — Cotlogastcr shnmardi (from Fishes of Illinois). 



Key to the Species of Ulocentra 



ai Gill membranes narrowly connected U . stigmcca. 



ao Gill membranes broadly connected. 



bi Opercles naked or nearly so [/. histrio. 



b2 Opercles scaly U. simotera. 



U. stignicea (Jord.). Length 60 mm.; head 4.25; depth 5; color 

 olivaceous, speckled above; sides with 8 dark green blotches below the 

 lateral line; rays of dorsal fins X to XIII-12; anal II, 7; scales 5-46 

 to 55-10; opercle and cheek scaly; lateral line incomplete: Tennessee 

 and Georgia to Arkansas and Louisiana; rather common in pine woods. 



U. histrio (Jordan & Gilbert). Length 50 mm.; head 4 to 4.25; 

 depth 5 to 5.5; color very dark green, with 7 light dorsal cross bars 

 usually alternating with bars beneath the lateral line; fins all barred; 

 head naked; rays of dorsal fins X-13; anal II, 7; scales 5-50 to 54-10: 

 southern Indiana and Kentucky to Arkansas; common. 



U. simotera (Cope). Length 75 mm.; head 4 to 4.6; depth 4 to 5; 

 color green; sides with dark blotches; belly yellow; dorsal fins variegated; 

 back spotted with red; rays of dorsal fins X to XII-io or 11; and II, 

 7; scales 6-48 to 52-11; snout very short: western Virginia and eastern 

 Kentucky to Alabama; very common in clear streams. 



8. Diplesion Rafinesque. Body slender; head very blunt; mouth 

 very small, inferior; premaxillaries protractile; gill membrane broadly 

 connected; lateral line complete; pyloric cseca 4: i species. 



