FISHES 69 



P. grandis (Ayres). Similar to P. oregonensis; rays of dorsal lin 

 8; anal 8; scales 70 to 80: central and northern California; Oregon; 

 common. 



P. lucius Girard. White salmon. Length up to 1,500 mm.; weight 

 up to 80 lbs.; head 3.5; depth 5.5; color uniform; rays of dorsal fin 9; 

 anal 9; scales 83 to 90: Colorado basin; very common ; the largest species 

 in the family. 



18. Gila Baird & Girard. Body elongate; caudal peduncle long and 

 slender; tail widely forked; teeth 2, 5-4, 2, hooked; scales very small; 

 dorsal fin behind the middle of the body; size large: 3 species. 



G. elegans B. & G. Bony-tail. Length 300 mm.; head and 

 depth 5; color bluish above; rays of dorsal fin 9; anal 10; scales 

 23-85-10; back arched; head short and broad: Colorado and Gila 

 Rivers; abundant. 



G. rohusta B. & G. Roundtail. Length 400 mm.; head 4; depth 5; 

 color plain; rays of dorsal fin 9; anal 9; scales 17-80-10: Colorado and 

 Gila Rivers; very common. 



19. Siboma Girard. Lateral line complete in adult; caudal pedun- 

 cle very stout; dorsal above ventrals; scales comparatively large and 

 well imbricated : 2 species. 



S. crassicauda (Baird & Girard) . Length 300 mm. ; head 4; depth 3 ; 

 color brownish; scales 9-56-7; body short, compressed, deep: California, 

 common in the Sacramento and San Joaquin. 



20. Tigoma Girard. Lateral line complete in adult; caudal pedun- 

 cle not stout; scales small and not closely imbricated; dorsal behind 

 ventrals: 7 species. 



T. hicolor (Girard). Length 300 mm.; head and depth 3.75; color 

 dusky above, silvery below; scales 13-60-7 ; teeth 2, 5-5, 2 ; dorsal fin over 

 ventrals: Klamath Lakes, Oregon. 



T. atraria (Gir.). Chub. Length 350 mm.; head and depth 2)-5\ 

 color blackish, the scales dotted and with dark edges which form lines; 

 rays of dorsal fin 9; scales 10-55 to 63-5; mouth very oblique: Great 

 Basin of Utah; Yellowstone Park; Snake River basin; common. 



21. Cheonda Girard. Lateral line complete in adult; anal fin 

 long; scales not closely imbricated: 8 species. 



C. copei Jordan and Gilbert. Length 150 mm.; head 4.25; depth 

 3.75; color bluish olive above; sides silvery; scales very small, 19-80-12 : 

 Great Basin of Utah; very common. 



C. egregia (Gir.). Length 85; head 3.6; depth 4.25; color blackish 

 with 2 parallel, lateral dark bands separated by a light one which meet 

 on the caudal peduncle, and a broad red band; belly golden, reddish in 



