44 VERTEBRATE ANIMALS OF THE UNITED STATES 



feed, but probably returns to the sea before spawning, and again ascends 

 late in the fall for that purpose. 



Subspecies of S. salar 



S. s. sehago Girard. Smaller and non-migratory; average weight 2 

 lbs.: Sebago Pond, Maine, and other lakes to the northward. 



5. .y. oiiananiche Jordan & Evermann. Average weight 2 lbs.; 

 teeth, fins and eyes very large : Lake St. John and other lakes in Quebec. 



3. Trutta L. Trout. Similar to 5a/mo; vomerine teeth numerous; 

 scales moderate or small, numbering 115 to 200: many species, all on 

 the Pacific Slope and in the Rocky Mountain region, and allied to the 

 European and Asiatic trout. 



T. clarkii Richardson. Cutthroat trout; black-spotted trout (Fig. 

 20). Length up to 400 mm. or more; weight up to 20 lbs.; head 4; 



Fig. 20. — Trutta clarkii (from Jordan t" Evermann) . 



depth 4; rays of dorsal fin 10; anal 10; scales 39-160 to 170-30; body 

 elongate; head short and blunt; pyloric caeca 43; color usually silver 

 gray, profusely spotted with black, round spots which may extend on to 

 the belly; lower jaw blotched with red (cutthroat); middle of side 

 usually with a broad rosy wash: coastal streams and lakes from north- 

 ern California to British Columbia and Alaska; up the Columbia River 

 basin as far as Shoshone Falls ; spawning in the spring and early summer. 



T. lewisi (Girard). Yellowstone trout. Similar to T. clarkii, but 

 more robust; spots not extending on the belly: Columbia River basin 

 above Shoshone Falls; head waters of the Missouri; Yellowstone Park. 



T. gibbsii (Suckley). Silver trout. Similar to T. clarkii, but with 

 scarcely any red on the lower jaw; scales 140 to 145: Idaho, Oregon 

 and Washington between Shoshone Falls and the Cascades. 



T. henshawi Gill & Gordon. Tahoe trout; redfish. Similar to T. 

 clarkii; body slender; head pointed; rays of dorsal fin 11; anal 12; 

 color green above, sides silvery, with a copper shade; spotted all over: 

 lakes and streams on the eastern slope of the Sierras. 



T. tahoensis J. & E. Silver trout. Similar to T. clarkii; size very 

 large; rays of dorsal fin 9; anal 12; scales 33-205-40: Lake Tahoe, in 

 deep water. 



