64 TELEOSTEI. — EVENTOGNATHI. — XII. 



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

 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; fins all high; P. as long as head; C. deeply forked. 

 Head 4 ; depth 5-1^. A. 7. Lat. 1. 44. L. 2. Missouri Kiver, 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 Z\ in head; barbel long; P. large, 

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

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

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

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

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

 but with two barbels on each side.) (if, hog ; a-TOfia, mouth.) 



dd. Dorsal fin 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 J. A. 8. Scales 8-56-4. L.4. Tenn.R. 

 (Lat., solitary.) 



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

 or less before V. ; body not conspicuously speckled, 

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



141. H. dissimilis (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 6-47-5. 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 laro-e, 

 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 5-3S-4. L. 4. Ohio Valley to 

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

 color. (dfifiXis, blunt ; &\jf, face.) 



