64 TELEOSTEI. — EVENTOGNATHI. — XII. 



e. Lower lobe of C. chiefly black; upper lobe pale; color pale, un- 

 spotted. 



138. H. gelidus (Girard). Very slender ; snout long, thick, blunt, 

 overhanging the rather large mouth; barbel as long as eye; eye 

 4^ in head; (ins all high; P. as long as head; C. deeply forked. 

 Head 4 ; depth 5^. A. 7. Lat. 1. 44. L. 2. Missouri lliver, abun- 

 dant in the river channels but not ascending brooks ; a singular 

 little fish. (Lat.. frigid.) 



ee. Lower lobe of C. pale, like the upper ; body dusted with dark 

 specks. 



139. H. hyostomus (Gilbert). Body and head very slender; 

 snout long, acute, projecting beyond mouth for half its length; 

 mouth short, wide, inferior ; eye 3} in head; barbel long; P. large, 

 other fins small; 13 scales before D. Head 4; depth 5 J. A. 8. 

 Lat. 1. 37. L. 2^. Silvery, dusted with dark specks. Ind. to 

 Iowa. (Similar species are //. cestivalis Girard, Ark. to Mexico, 

 still more slender, with longer snout and much smaller eye, 4 in 

 head, and H. tetranemus Gilbert, Kansas, nearly like H. cestivalis, 

 but with two barbels on each side.) (is, hog; o-ro/ta, mouth.) 



d<l. Dorsal tin with a large black blotch on its last raj's; scales small. 



140. H. monachus (Cope). Body slender; head long and 

 slender ; eye 4| in head ; 24 scales before D. Olivaceous, sides 

 silvery; a black spot at base of C. ; no lateral band; scales not 

 speckled. Head 4 ; depth 5^. A. 8. Scales 8-56-4. L.4. Tenn. R. 

 (Lat., solitary.) 



bb. Eyes very large, 2f to 3 in head; barbels conspicuous ; D. inserted more 

 or less before V. ; body not conspicuously speckled. 

 f. Teeth 4-4; sides with dark blotches. 



141. H. diasimilis (Kirtland). Body very long and slender; 

 head long, the snout blunt at tip, projecting beyond the small 

 mouth ; eye 2| in head ; P. long ; 22 scales before D. Olivaceous, 

 with dusky lateral band, along which are several large round dusky 

 spots, the most distinct at base of C. Head 4^; depth 5-|. D. 8. 

 A. 7. Scales 6-4 7-5. L. 5. Lake Erie to Ky. and Iowa. (Lat., 

 unlike.) 



ff. Teeth, 1, 4-4, 1 or 0. 



g. Sides with a dark lateral band overlaid by silvery. 



142. H. amblops (Rafinesque). Body slender, the head large, 

 flattish above ; eye longer than snout, 3 in head ; mouth small ; 

 snout bluntly decurved ; 16 scales before D. Greenish; sides with 

 a blackish or plumbeous band extending around snout, overlaid by 

 silvery. Head 4 ; depth 5. Scales 5-38-4. L. 4. Ohio Valley to 

 Ala., common. Smaller than the next, and somewhat different in 

 color. (dfxfiXCs, blunt ; w^, face.) 



