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 isa 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 
