EXPLORATIONS IN COLORADO AND UTAH. 
15 
the body being less crowded than in spilwrus and stomias. In other respects virginalis 
scarcely differs from clarM. 
The large fishes from Utah Lake are very pale in color, the dark spots few and 
small, much as in var. macdonaldi, but fewer, and juore on the back. This pale color- 
ation is characteristic of lake and sea trout in general. It is doubtless partly due to 
the alkaline character of the waters of Utali Lake. 
h. Salmo mykiss stomias (Cope). (Plate I, Fig. 2.) 
Arkansas and Platte Eivers. A small trout, with very large black spots and small 
scales. It closely approaches lewisi and spihmis. The black spots are always larger 
than in any of these, and mostly gathered on the tail, 
i. Salmo mykiss macdonaldi Jorilau and Everniaim. Yollow-linued Trout. lu Twiu Lakes. 
(Plate I, Fig. 1.) 
The most strongly marked of these varieties so far as color and general appear- 
ance are concerned. The head is long and the opetcles longer than in most of the 
others. Probably an early off-shoot, perhaps inhabiting these lakes prior to the 
advent of var. stomias in the same region. The nearest relative is pleuriticus, from 
which I think it is descended. 
k. Salmo mykiss bouvieri (Beudire). (Plate IV, Fig. 10.) 
In Waha Lake, in Washington, a mountain lake without outlet; a peculiar form, 
with short, blunt head, large eye, moderate (ICO) scales, and the spots confined to the 
liosterior half o.f the body. This form seems to be an off-shoot from clarici. 
The following table was taken from a number of sjiecimens of partly grown trout, 
most of them from 8 inches to a foot in length (those from Utah Lake, Henry Lake, 
and Eiddle Lake being larger). In the size of fins, number of gill-rakers, dentition, 
etc., no differences of any importance have been noticed. 
Head in 
length. 
Depth 
in 
length. 
Eye in 
head. 
Maxil- 
lary in 
head. 
Scales. 
Spots. 
Trapper’s Lake (spilurus) 
4g 
4| 
5 
189 
Lar^G, clovse, and chielly posterior. 
Gunnison River (pleuriticus) 
a 
4i 
5 
2 
188 (125 pores) 
Large; chielly posterior; a few on head. 
Rio Florida (pleuriticus) 
a 
4s 
4? 
2 
185 
Same ; anterior spots smaller. 
Rio Grande (spilurus) 
4 
4 
54 
1 9 
155 (115 pores) 
Large ; chiefly on tail. 
Rio G-rande {spilurus) 
4i 
s-i* 
5 
2 
IfiO 
Same. 
Walla-walla (ctorfci) 
3| 
4i 
li 
177 
Rather large ; scattered almost equallv. 
Henry’s Lake, Idaho (clarki) 
H 
3 b 
5 
178 
Small ; very closely set, especially he- 
hind. 
Riddle Lake, Wyoming (lewisi).. . 
41 
5 
1 2 
170 
Rather large ; notclovse set; more nu- 
merous behind, but not confined. 
Utah Lake (virginalis) 
3i 
4i 
5 
1b 
148 (150 pores) 
Small ; mostly confined to back ; few 
on tail. 
Provo River (virginalis) 
4l- 
5 
2 
145 (121 pores) 
Ratlier large ; scattered equally. 
Provo River (virginalis) 
4 
ik 
5 
2 
141 
Same. 
Bear Creek, near Denver (stomias). 
4i 
44 
44 
2 
180 
Large; largest ou tail. 
Twin Lakes {stomias) 
ih 
41 
ii 
2 
193 (140 pores) 
Very large; well defined; largest on 
tail. 
Twin Lakes (macdonaldi) 
4A 
4i 
54 
2 
184 
Very small; smaller than nostril ; most 
numerous behind. 
4 
4i 
41 
T| 
183 
Very .small ; most numerous behind. 
44 
3i 
dh 
2 
160 
Large ; all on the tail. 
Very small ; most numerous behind. 
Eagle River (pleuriticus) 
Us 
4| 
I5 
175 
Besides the native trout, macdonaldi and stomias, the following trout have been 
introduced into the Twin Lakes. 
