MISSOURI xAIOUSE. 
328 
the hairs on the sides are broadly tipped with yellowish-fawn, and 
on the back, are first fawn, and then slightly tipped with black ; on 
the under surface, the hairs are at the roots plumbeous, broadly tipped 
with white. The ears are nearly white, having a slight tinge of buft’ on 
the outer and inner surfaces, edged with pure white ; on the sides of the 
checks, and an irregular and indistinct line along the sides, the colours 
are brighter than those on the flanks, and may be described as light yel- 
lowish-brown. The feet, on both surfaces, belly, and under surface of tail, 
white ; from this admixture, this species is on the back, light fawn, with 
an indistinct line on the back, and upper surface of tail, of a shade dark- 
er colour. 
DIMENSIONS. 
Inches. 
From point of nose to root of tail. 
Height of ear, posteriorly. 
HABITS. 
We close our second volume with this new species of mouse, of which 
we have given three figures. This pretty little animal was discovered for 
us by Mr Dejuo, during our sojourn at, and in the neighbourhood of Fort 
Union in 1843. It was in full summer pelage, having been killed on the 
14th of July. At that time being in quest of antelopes and large animals, 
we did not give it that close attention, which we should have done. A 
glance at our plate, or an examination of our description, will suffice to 
convince any one of its being entirely new. This species is much larger, 
and has a thicker and shorter tail than mus leucojms. 
Expecting to get more of them we did not make any notes of the 
habits of those killed at that time, and which had doubtless been observed 
by the hunters, who procured them. The next day after they were 
brought in, we left the fort on an expedition to the Yellow-Stone river, 
from which we did not return for some time. 
As a short description of our mode of travelling, &c., the first day’s 
journal is here given. “ July 15, Saturday, we were all up pretty early, 
making preparations for our trip to the Yellow-Stone river. After break- 
fast all the party who were going, announced themselves as ready, and 
with a wagon, a cart, and two extra men from the fort, we crossed the 
Missouri, and at 7 o’clock, were fairly under way ; Harris, Belu, Cul- 
bertson, and ourself in the wagon. Squires, Provost, and Owen on horse- 
