FISHES 71 



at base of tail; scales 7-43-5 ; lateral line very short: basin of the Tennes- 

 see; common in northern Alabama. 



27. lotichthys Jordan and Evermann. Size minute; no lateral line: 

 I species. 



I. phlegethontis (Cope). Length 35 mm.; head 3.75; depth ^.2,] 

 color olivaceous, with a dark lateral band; belly golden; rays of dorsal 

 fin 7; scales 6-36-4, 17 before the dorsal fin; teeth i, 5-4, 2; lateral line 

 absent: basin of Great Salt and Sevier Lakes; very common; the smallest 

 of the family. 



28. Siphateles Cope. Roaches. Body stout, somewhat com- 

 pressed, mouth oblique; no barbels; size moderate; teeth 4-5, 

 5-5 or 6-5; rays of dorsal and anal fins usually 8: numerous species in 

 America, Europe and Asia; 7 species in the United States, all in the 

 extreme west. 



5. 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. 



5. bicolor (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 ; 

 Sacramento-San Joaquin Basin common, 



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

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



S. columhianus Snyder. Length 136 mm. ; head and depth 3.7 ; color 

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



29. Hesperoleucus Snyder. Similar to Siphateles, but with a 

 shorter head and a slenderer body: several species, all near San Fran- 

 cisco 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. 



