58 VERTEBRATE ANIMALS OF THE UNITED STATES 



C. microps Rutter. Length 130 mm.; head 4.5; depth 4.7; rays 

 of dorsal fin 11; anal 7; scales 17-81 to 87-14; eye very small: Medoc 

 County, California. 



C. tsiltcoosensis 'EveTYna.nn & Meek. Length 300 mm.; head 4.5; 

 depth 5 ; rays of dorsal fin 13 ; anal 7 ; scales 13-65-8, 34 before the dorsal : 

 fins small: coastal streams of middle Oregon. 



6. Chasmistes Jordan. Head large; snout elevated; mouth ter- 

 minal and very large, with a long, very oblique lower jaw; upper lip 

 thin and smooth; lower lip with a broad flap on each side and narrow in 

 front: 6 species, all in the far-west. 



Key to the Species of Chamistes 



ai Scales 60 to 65 in the lateral line. 



bi In Utah Lake C. liorus. 



bo In Pyramid Lake C. cujus. 



a.t Scales 70 to 80 in the lateral line; in the Klamath Lakes. 



bi Snout very short; rays of anal fin 9 C. brevirostris. 



bo Rays of anal fin 7. 



Ci Snout with prominent hump C. stomias. 



Co No hump on snout. 



di Fins not very small C. luxatus. 



do Fins very small C. copei. 



C. liorus Jord. Length 450 mm.; head 3.5; depth 5; end of snout 

 elevated; color dusky; back and sides covered with dark punctulations : 

 rays of dorsal fin 11; anal 7; scales 9-63-8: Utah Lake; very common; 



C. cujus Cope. Rays of dorsal fin 11; anal 7; scales 13-65-11. 

 Pyramid Lake, Nevada, in deep water. 



C. brevirostris Cope. Rays of dorsal fin 11; anal 9; scales 1 2-75-1 1: 

 Klamath Lakes, Oregon. 



C. {Deltistes Scale) luxatus Cope. Length 900 mm.; head 4; depth 

 4.8; color dusky, with black punctulations; rays of dorsal fin 12; anal 

 7; scales 12-76 to 81-9; body elongate; head very long and slender: 

 Klamath Lakes region, where it is abundant and the most important 

 food fish. 



C. stomias Gilbert. Length 450 mm.; color dark above; rays of 

 dorsal fin 10; anal 7; scales 14 or 15-76 to 82-11: Upper Klamath Lake; 

 common. 



C. copei Evermann & Meek. Similar to C. stomias; scales 13-80- 

 1 2 ; mouth very oblique : Klamath Lakes. 



