56 VERTEBRATE ANIMALS OF THE UNITED STATES 



Ci In the northern United States C. catostomus. 



C2 In Lake Tahoe C. tahoensis. 



ao Less than 75 scales in the lateral line, 

 bi In the western States. 

 Ci On the Pacific slope. 



di In California C. occidentalis. 



dt In Oregon C. tsiltcoosensis. 



ds In Oregon and California C. snyderi. 



C2 In the Great Basin and the Rocky Mountains. . . C. microps. 



di From Oregon to Montana C. macrochcilus. 



do In Utah C. ardens. 



bi In the eastern and central States. 



Ci Lateral line with 64 to 70 scales C. commersoni. 



C2 Lateral line with 46 to 51 scales C nigricans. 



C. latipinnis Baird & Girard. Length 600 mm.; head 4; depth 5.5; 

 color dark oHve; sides and fins orange; rays of dorsal fin 14 or 15; anal 

 7; scales 19-89 to 102-18, 46 to 50 before the dorsal fin; lips very thick, 

 the lower extending backward to beneath the eye; fins very large: 

 basins of the lower Colorado; common. 



C. discobolus Cope. Length 300 mm. or more; head 3.8 to 4.5; 

 depth 5.25; rays of dorsal fin 12 or 13; anal 7; scales 19 to 21-101 to 109- 

 17 to 21, 52 to 63 before the dorsal fin; mouth as in C. latipinnis; 

 muzzle extending to slightly beyond upper lip: upper Colorado basin; 

 Montana. 



C. griseus (Girard). Length 500 mm.; head 4; depth 5.5; color 

 brown; rays of dorsal fin 10 to 12; scales 16-90 to 1 10-14; upper lip very 

 long and pendant; lower lip deeply incised: upper Missouri basin; 

 abundant in the Yellowstone. 



C. rimiculus Gilbert & Snyder. Length 400 mm.; head 4; depth 5; 

 color dusky; rays of dorsal fin 11; anal 7; scales 18-91-13, 42 before the 

 dorsal fin; upper lip with 5 rows or tubercles: northern California. 



C. catostomus (Forster). Long-nose sucker. Length 750 mm.; 

 head 4.5; depth 4.5; rays of dorsal fin 10 to 11; anal 7; scales 14 to 17-95 

 to 1 1 7-13; upper lip with 2 to 4 rows of tubercles; lower lip deeply 

 incised; mouth inferior; head very long and slender, the snout over- 

 hanging the mouth: from Maine and the basin of the St. Lawrence 

 and the Great Lakes to southeastern Oregon and the upper Columbia, 

 and northward to Alaska; abundant northward; spawning in spring; 

 of some food value. 



C. tahoensis Jordan. Red sucker. Similar to C. catostomus, but 

 with 83 to 92 scales in the lateral line and a stouter body: region of 

 Lake Tahoe; very abundant. 



