FISHES 



59 



7. Xjrrauchen Eigenmann & Kirsch. Like Catostomus, except that 

 immediately behind the head is a very prominent, sharp-edged hump; 

 snout blunt: i species. 



A', cypho (Lockington) . Razor-back. Head and depth 4; rays of 

 dorsal fin 13 or 14; anal 7; scales 13 to 15-72 to 77-13; color olivaceous: 

 Colorado basin; abundant. 



8. Erimyzon Jordan. Body fusiform, compressed; scales large; 

 lateral line wanting: i species. 



E. sucetta (Lacepede). Chub sucker (Fig. 28). Length 250 mm.; 

 head 4.25; depth 3; color dusky, with a coppery lustre; young with a 



Fig. 28. — Erimyzon sucetta {from Jordan bf Evermann). 



broad black lateral band or series of blotches; rays of dorsal fin 11 to 12 ; 

 anal 7; scales 36-15, in southern specimens, but 43-15 north of Virginia: 

 Great Lakes region; Mississippi Valley; coastwise from Virginia to 

 .Texas; very common. 



9. Minytrema Jordan. Body elongate, little compressed, with an 

 interrupted lateral line in the adult, and a small black spot at the base 

 of each scale on the side: i species. 



M. melanops (Rafinesque). Spotted sucker. Length 600 mm.; 

 head 4.3; depth 3 to 4; color dusky above, with usually a black blotch 

 behind the dorsal fin; rays of dorsal fin 12 to 14; anal 7; scales 44 to 47 : 

 Great Lakes to North Carolina; upper Mississippi Valley to Texas; 

 common. 



10. Moxostoma Rafinesque. Redhorse. Body elongate; mouth 

 inferior; lips well developed, with transverse folds (Fig. 29); jaws with- 

 out cartilaginous sheath; upper lip protractile; scales large; anal fin 

 high, with 7 rays; fontanelle present: about 20 species, mostly of small 

 size, all in the eastern and central States. 



