126 The Mammals of Colorado 
beetles, scorpions, and small insects and occasionally parts 
of a lizard or mouse." It is no doubt at times responsible 
for the destruction, in the collector's traps, of specimens which 
are often eaten before the collector can get around to them, 
but other animals must take their share of the blame, for 
deer-mice and spermophiles will do the same thing. 
The Grasshopper Alice breed in spring and early summer, 
bringing forth from three to six young in a litter; probably, 
judging from examinations made of pregnant females, four 
is about the usual number. 
It seems probable that these mice may be regarded as 
rather beneficial than otherwise. They do not seem disposed 
to injure crops in any way, and must certainly destroy con- 
siderable numbers of noxious insects. 
Onychomys leucogaster brevicaudus (Lat. brevis, short, 
+ Cauda tail). Short-tailed Grasshopper blouse. 
Onychomys leucogaster brevicaudus Merriam, A'. A. Fawna, Xo. 5, 
p. 52 (1891). 
Type locality.— Blackfoot, Idaho (V. Bailey and B. H. Dutcher). 
Measurements. — Total length, 5.5; tail vert., 1.6; hind foot, 0.8. 
Description. — (From a specimen taken on the Snake River, west- 
em Routt Co., June 21st): Above, grayish, especially on shoulders, 
darker on rump; sides and flanks tawny; upper surfaces of feet and 
entire underparts white. White hairs in front of ear at base, and 
whole ear grayer than in pallescens. Basal two thirds of upper part 
tail dark tawny, tip white. 
Distribution. — This species is found in northwestern Colorado, 
on the sage plains of the North Park, in Larimer County, and north 
of the Bear River, Routt County. Cary took it at Canadian Creek, 
east of Walden, Xorth Park; Snake River, south of Sunny Peak, 
and Bear River south of Lay, Routt County. Allen records one 
from Honnold, Routt County. I took it at Craig, and on Snake 
River, seven miles north of Lily, Routt County. 
Habits. — The habits of this species are undoubtedly similar 
to those of the preceding. I have no special information 
regarding them. 
