Nebraska Deer-Mouse 
Peromyscus maniculatus nebrascensis. Nebraska 
Deer-Mouse. 
Hespcromys leucopus nehraccnsis Mearns, Bull. Am. Mus. N . H., 
ii., p. 287 (1890). 
Type locality. — Calf Creek, Custer County, Montana. 
Measurements. — Total length, 6; tail vert. 2.6; hind foot, 0.78. 
Description. — It is very difficult to draw up a description of this 
species which will differentiate it from the preceding. But as a 
rule it is a paler, less fulvous form. This difference is not so 
noticeable in individual specimens, but when series of each form are 
compared en masse the difference is at once apparent. 
FIG. 43. NEBRASKA DEER-MOUSE, Peromyscus m. nebrascensis 
Skull showing dentition x 4 
The Nebraska Mouse also averages somewhat smaller than the 
Tawny, though extremes of both are about the same. The color of 
this species varies somewhat with locahty; those taken by myself, 
near Wray, Yuma Co., being very light tawny and were labelled by 
Mr. Osgood of the Biological Survey as "approaching luteus." 
Specimens from Routt and Rio Blanco counties seem to grade 
toward rufinus. 
Distribution. — The Nebraska Deer-mouse is found from Alberta 
southwards through Montana, western North and South Dakota, 
