oe Distribution of the Salmonide. 
all the known Salmonoids of the world is mentioned by Professor 
E. D. Cope, in the AMERICAN NATURALIST, August, 1886, page 
735. He has young black-spotted trout obtained by Professor Lup- 
ton from streams of the Sierra Madre, Mexico, at an elevation 
between eight and nine thousand feet, in the southern part of Chi- 
huahua, near the boundaries of Durango and Cinaloa. They have 
teeth on the basihyals, and resemble, in other respects, Salom 
purpuratus of the Great Basin. 
Atlantic Salmon (Salmo salar). Susquehanna River. About 1% natural length. 
Introduced by U. S. Fish Commission, 
Students of the Salmonide in Europe frequently refer all of the 
numerous nominal species of Salmo to three principal forms—salar, 
trutta, and fario. The first two represent the genus Salmo, charac- 
terized by anadromous habits and imperfect development of the 
vomerine teeth. The third is placed in the sub-genus Fario, which 
has persistent, well-developed vomerines in one or two series, and, 
in its habits is non-migratory. One noticeable feature about the 
European species of Salmo is that they are nearly all large-scaled 
seldom having more than 125 scales in a longitudinal series. The 
only exception to this rule is Salmo microlepis of Hungary, which 
has 135 to 140 rows of scales. North America and Asia have at 
least one species of Salmo in common,—a small-scaled species,—S- 
purpuratus. This is the most widely-distributed and the most vari- 
able of our species. Northward, we have no certain knowledge of 
it beyond Unalaska ; southward, it ranges to Mount Shasta, in Cali- 
fornia. Its distribution is extended by the varieties, henshawi» 
pleuriticus, and stomias, Salmo henshawi occurs in Tahoe Lake, 
California, Pyramid Lake, Nevada, and in streams of the Sierra 
Nevada. Salmo pleuriticus occupies the Utah Basin and the head- 
waters of the Rio Grande. The trout found in Mexico may be 
closely similar to this, as it seems to inhabit affluents of the Rio 
