. Report of explorations in Colorado and Utah during the summer of 1889 : with an account of the fishes found in each of the river basins examined . ounding in all its tributaries aud extending southward in the mountains tonorthern Chihuahua. This form is apparently wholly identical with var. pleuriticusexcept that in the specimens examined the scales are less crowded forward, so thatthe number in a lengthwise series is less. I count 155 to 1G0 in Rio Grande specimens;185 to 190 in those from the Colorado. From the trout of the Great Basin (virginalis),spilurus differs chiefly in the arrangeme
. Report of explorations in Colorado and Utah during the summer of 1889 : with an account of the fishes found in each of the river basins examined . ounding in all its tributaries aud extending southward in the mountains tonorthern Chihuahua. This form is apparently wholly identical with var. pleuriticusexcept that in the specimens examined the scales are less crowded forward, so thatthe number in a lengthwise series is less. I count 155 to 1G0 in Rio Grande specimens;185 to 190 in those from the Colorado. From the trout of the Great Basin (virginalis),spilurus differs chiefly in the arrangement of its spots. g. Salmo mykiss virginalis (Girard). (Salmo Utah Suckley.) The Trout of Utah Lake. (Plate III, Fig. 9.) The trout of the Great Basin are profusely and not very coarsely spotted, thespots being numerous anteriorly as well as posteriorly, confined to the back ratherthan to the tail. In several examined, the scales are a little larger than in any ofthe other forms, 140 to 150 in a lengthwise series, the scales on the anterior part of 0 Bull U. S. F. C. 1889.— (To face page Jordan. Colorado and Utah Explorations. Plate Fig. 6. Colorado River Trout (Salmo mykisspleuriticus). (See page 14.) EXPLORATIONS IN COLORADO AND UTAH. 15 the body being less crowded than in spilurus and stomias. In other respects virginalisscarcely differs from clarki. The large fishes from Utah Lake are very pale in color, the dark spots few audsmall, much as in var. macdonaldi, but fewer, and more on the back. This pale color-ation is characteristic of lake aud sea trout in general. It is doubtless partly due tothe alkaline character of the waters of Utah Lake. h. Salmo mykiss stomias (Cope). (Plate I, Fig. 2.) Arkansas and Platte Pivers. A small trout, with very large black spots and smallscales. It closely approaches lewisi and spilurus. The black spots are always largerthan in any of these, and mostly gathered on the tail. i. Salmo mykiss macdonaldi Jordan and Evermann. Yellow-
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