FISHES 



57 



C. occidentalis Ayres. Length 250 mm.; head 4.5; depth 5; body 

 slender; color dark above; dorsal tin with 12 to 14 rays; scales 13-75-10, 

 40 before the dorsal fin; middle California; common. 



C. mniotiltus Snyder. Length 200 mm.; head and depth 4.8; rays 

 of dorsal fin 12; anal 7; scales 57: Monterey County, California. 



C. macrocheiliis Girard. Length 150 mm.; head 4; depth 5; color 

 dark, with a darker lateral stripe; rays of dorsal fin 12 to 14; anal 7; 

 scales 12-72-10; head large; upper lip with 6 to 8 rows of papilLT: 

 Oregon and Washington, into Montana; common. 



C. commersoni (Lacepede). Common sucker (Fig. 27). Length 

 450 mm.; head and depth 4 to 5; color olivaceous; rays of dorsal fin 



Fig. 27. — Calaslomus commersoni {from Jordan isf Evermann) . 



12; anal 7; scales 10-64 to 70-9; mouth large; upper lip narrow, with 3 to 

 5 rows of papillae: Maine, Valley of the St. Lawrence and Great Lakes 

 to Montana; northward to New Brunswick, Labrador and Hudson 

 Bay; southward into Georgia and Missouri; very common in small 

 streams and ponds; a good food fish. 



C. ardens Jordan & Gilbert. Similar to C. commersoni, but with a 

 larger mouth and lips; scales 12-70 to 72-12: Great Basin of Utah; 

 very common. 



C. nigricans LeSueur. Hog sucker. Length 600 mm.; head 4.5; 

 depth 5; color olivaceous, sides brassy; lower fins red; back and sides 

 with black blotches; rays of dorsal fin 10 or 11; scales 7-46 to 51-6; 

 head large; upper lip very thick, with 8 to 10 series of papillae: New 

 York to Minnesota; southward to the Carolinas and Arkansas; abun- 

 dant in clear streams. 



C. snyderi Gilbert. Length 500 mm. ; head 4.5 ; depth 4; color dusky; 

 belly white; rays of dorsal fin 11; anal 7; scales 13-70-11: Klamath 

 Lakes region. 



