FISHES 57 



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

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

 County, California. 



C. tsiUcoosensis Evermann & Meek. Length 300 mm.; head 4.5; 

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

 fins small: coastal streams of middle Oregon. 



7. Hypentelium Ralinesque. Similar to Catostomiis but with 

 larger scales (about 50 in lateral line); head large, concave above: 

 I species. 



H. 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 papilke: New 

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

 dant in clear streams. 



8. 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. 



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. hrevirostris Cope. Rays of dorsal fin 11; anal 9; scales 12-75-11: 

 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- 

 12; mouth very oblique: Klamath Lakes. 



9. Thoburnia Jordan and Snyder. Similar to Catostomiis. but with 

 larger scales (about 50 in lateral line); head very small, flat above: 

 I species. 



