THE FAUNA OF MONTANA TERRITORY. 125 
Toap (Bufo Columbiensis B. and G.?). A large toad was 
occasionally observed along the Hell Gate and Bitterroot 
Valleys, but was not very common. 
SrorrEp Froe (Rana halecina Kalm). I saw this frog 
on the Missouri among the mountains, which it probably 
crosses, being found at Fort Dalles by Dr. Suckley. 
IV. FISHES. 
Lewis’ Trout (Salmo Lewisii Girard). This fine trout 
abounds in the headwaters of the Missouri, up to their sources 
on the eastern slope of the mountains, and a few were taken 
at and near Fort Benton by the soldiers, all of them large 
ones. They bite readily at almost any artificial fly ; also at in- 
sects, meat, pork, and even leaves and flowers, after they had 
been tempted with grasshoppers. Officers and men, nearly 
all who were not on duty, would crowd to the banks of the 
beautiful mountain streams, and catch as many as the whole 
command of three hundred men could eat every day, and 
with tackle of all kinds, from a rude stick with a piece of 
common twine and a large hook, to the most refined outfit 
of the genuine trout-fisher. The form differs very much from 
the figure given in Dr. Girard’s Report, and in the Natural 
History of Washington Territory, being, as the specimens 
show, much more elongated, like most other species. I also 
took specimens of small size across, to compare with those 
on the western slope, and am very doubtful whether these 
can be considered a distinct species, though a comparison of 
larger specimens may prove them to be so. If distinct, the 
trout of the western slope is exceedingly near S. Lewisii. 
It is equally abundant down to the crossing of the Bitterroot, 
but less so in the streams on both sides of the Cœur d'Alene 
Range, probably from their excessively shallow and rapid 
current. I saw no difference, however, in those taken at 
Cœur d’Alene Mission from those of the Little Blackfoot. 
The differences noticed between these and those of the 
Missouri were as follows :— Evidently fatter and in better 

