52 VERTEBRATE ANIMALS OF THE UNITED STATES 



b2 Scales larger, 36 to 50 in the lateral line. 



Ci Lateral line wanting or incomplete; air bladder in 2 

 parts. 



di Lateral line entirely wanting 11. Erimyzon. 



d2 Lateral line interrupted 12. Minytrema. 



Co Lateral line complete; air bladder in 3 parts. 

 di Lower Kp entire or merely lobed. 



C] Teeth compressed; mouth small 13. Moxostoma. 



14. Scartomyzon 

 t2 Lower teeth enlarged and cylindrical; mouth 



large 15. Placopharynx. 



do Lower lip split, forming two separate lobes 16. Logochila. 



I. Ictiobus Ratinesque. Buffalo fish. Large, rather stout fishes 

 with large head, furrowed opercles and broad subopercles; fontanelle 

 present; mouth inferior; lips thin, somewhat plicate; scales large; lateral 



.^ 



■" ■■{ * .' ■ ■ -^-St-^Qi 



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Fig. 25. — Megaslomalobus cyprinella {from Jordan is^ Evermanti). 



line prominent; dorsal fin long, the anterior rays being longer than 

 the others: 2 species in the United States, i in Mexico, all rather 

 important food fish. 



I. urus (Agassiz). Black buffalo. Similar to M. cyprinella, but 

 with a smaller mouth and a much darker color; head 4; lips thick, 

 plicate; dorsal fin with 30 rays; anal 10; scales 8-41-7: Mississippi 

 Valley; less common than M. cyprinella. 



1. huhalus (Raf.). Small-mouthed buft'alo. Extreme length 900 

 mm.; extreme weight 35 lbs.; head 4; depth 2.5; mouth small, inferior; 

 lips thick, pHcate; color pale; dorsal fin with 29 rays; anal 10; scales 

 8-39-6: Mississippi Valley; common; in the larger rivers. 



2. Megastomatobus Fowler. Similar to Ictiobus; dorsal fin 

 elongate; mouth terminal, oblique; lips smooth and thin: i species. 



