72 VERTEBRATE ANIMALS OF THE UNITED STATES 



R. olivaceus (Cope). Length 300 mm.; head 4; depth 4.3; teeth 

 5-5; body slender, compressed; color dusky olive above; body and fins 

 dotted with black; scales 1 1-56-6: Lake Tahoe and Pyramid Lake; very 

 common. 



R. hicolor (Girard). Length 200 mm.; head 4; depth 4.5; color 

 olivaceous with a bluish lateral band; body with some brown spots; rays 

 of anal fin 7; scales 9-48-6; teeth 4-5: Lakes of southeastern Oregon; 

 common. 



R. thalassinus (Cope). Similar to R. bicolor, but with a larger 

 head and longer fins: southeastern Oregon. 



R. oregonensis Snyder. Length 200 mm.; head and depth 3.6; color 

 dark; scales 13-52-8: southeastern Oregon. 



R. columbianus Snyder. Length 136 mm.; head and depth 3.7; color 

 silvery, dark above; scales 12-49-7: southeastern Oregon. 



18. Hesperoleucus Snyder. Similar to Rutilus, but with a shorter 

 head and a slenderer body: several species, all near San Francisco 

 Bay. 



H. symmetricus (Baird & Girard). Length 125 mm.; head 3.75; 

 depth 4.2; color dusky above; sides pale, more or less dotted with black 

 and sometimes with a dark lateral band; rays of dorsal and anal fins 8; 

 teeth 5-4; scales 14-52 to 67-5; body rather elongate: central and 

 northern California, Oregon, Nevada and Utah. 



H. venustus Snyder. Length 100 mm.; head and depth about 4; 

 color silvery, with a narrow lateral stripe; rays of dorsal fin 9; anal 8; 

 scales 53: in streams entering San Francisco and San Pablo Bays. 



H. navarroensis Snyder. Length 90 mm.; head and depth 3.6; 

 color dark above, silvery below, with a narrow lateral stripe; rays of 

 dorsal and anal fins 8; scales 56: Navarro basin, northern Cahfornia. 



H. parvipinnis Snyder. Length 80 mm.; head and depth 3.9; scales 

 59; rays of dorsal fin 8; anal 7 : Gualala River basin, California. 



H. mitrulus Snyder. Length 84 mm.; head and depth 4.7; rays of 

 dorsal fin 8; anal 7; scales 60: Goose Lake, California. 



H. suhditus Snyder. Length no mm.; head t,.^; depth 3.6; rays of 

 dorsal fin 8; anal 7; scales 53: streams flowing into San Francisco Bay. 



19. Luxilinus Jordan. Similar to Abramis, but not carinated 

 ventrally and fully scaled: i species. 



L. occidentalis (Baird & Girard) Body elongate; color brownish 

 above; rays of dorsal fin 10; anal 11; sides silvery speckled: San Joaquin 

 basin, California. 



20. Opsopaeodus Hay. Mouth very small, terminal; teeth 5-5 or 

 4-5, strongly hooked; upper jaw protractile; size small: 2 species. 



