12 2 The Mammals of Colorado 
This genus, of which some thirty species have been de- 
scribed, is found in the southern part of the United States, 
in Mexico and Central America, the bulk of the species 
coming from Mexico. Only three species have been obtained 
within the limits of Colorado. They can be distinguished 
as follows: 
A. Above yellowish brown, mingled with black; sides and rump 
washed with fulvous; ears small. 
R. dychei nebrascensis, p. 122 
B. Above yellowish brown, tinged with rufous; much less black; 
ears large. R. megalotis, p. 123 
C. Above mouse-color (like common house mouse), with some 
fulvous. R. montanus, p. 123 
Reithrodontomys dychei nebrascensis {dychei, for L. L. 
Dyche; nebrascensis, of Nebraska). Nebraska 
Harvest Mouse. 
Reithrodontomys dychei nebrascensis Allen, Bull. Amer. Mus. Nat. 
Hist., vii., p. 122 (1895). 
Type locality. — Kennedy, Cherry County, Nebraska. 
Measurements. — Total length, 5.1 ; tail vert., 2.55 ; hind foot, 0.45. 
Description. — (From a specimen taken at Wray, Yuma Co., 
Mar. ist): Above yellowish brown, mingled with blackish hairs, 
especially on dorsal region, bright rufous hairs at base of ears in 
front ; feet and entire underparts white ; upper surface of tail black- 
ish, under part white. 
Distribution. — The Nebraska Harvest Mouse has been reported 
from Nebraska, Kansas, South Dakota, and Colorado. In Colorado it 
is probably found over much of the eastern part of the State , below the 
foot-hills, as indicated by the records at hand, it having been taken 
in Fremont, Boulder, Larimer, Denver, Adams, and Yuma counties. 
There is still of course much to be learned about its range. 
Habits. — This species seems to frequent the weedy borders 
of fields as much as any other place, and to a certain extent 
at least lives in nests made of fine grass and other material, 
and placed on the ground, either among thick bunches 
of grass or weeds, or under piles of weeds that may have 
