THE SALMON FAMILY. 73 



constant in all varieties of Salmo mykiss, at all ages, 

 it will furnish a good distinctive character. The 

 red-throated trout is found in every suitable river 

 and lake in the great basin of Utah, in the streams 

 of Colorado, Wyoming, and Montana, on both 

 sides of the Rocky Mountains. It is also found 

 throughout Oregon, Washington, Idaho, British 

 Columbia, and Alaska, probably no stream or lake 

 suitable for salmonoid life being without it. In 

 California the species seems to be comparatively 

 rare, and its range has not been well made out. 

 Large sea-run individuals apparently analogous to 

 the steel-heads are sometimes found in the mouth 

 of the Sacramento. In Washington Territory and 

 Alaska this species regularly enters the sea. In 

 Puget Sound it is a common fish. These sea-run 

 individuals are more silvery and less spotted than 

 those found in the mountain streams and lakes. 

 Numerous more or less tangible varieties of Salmo 

 mykiss occur, one of the most marked of which is 

 the beautiful trout (Salmo mykiss henshawi] found 

 in Lake Tahoe, the finest of all the mountain lakes 

 of the Sierra Nevada. The size of Salmo mykiss 

 is subject to much variation. Ordinarily, four to 

 six pounds is a large size ; but in certain favored 

 waters, as Lake Tahoe, and the fjord bays of the 

 Northwest, specimens from twenty to thirty pounds 

 are occasionally taken. No attempt has been 

 made (1880) to transport this, the finest known 

 species of black-spotted trout, to Eastern waters. 

 The writer thinks it much worthier of experiment, 

 in this regard, than the rainbow trout. The 

 great variety of the waters in which it occurs 



