Big-eared Harvest Mouse 123 
fallen or been cut down. I found one at Barr under an old 
piece of sheet iron lying on the prairie. 
Its food is seeds and grains, very likely insects, and any 
meat it may have a chance to get. 
One taken at Barr, May 31st, contained four embryos. 
Reithrodontomys megalotis (Grk. megas, great, + ous 
[otis] ear). Big-eared Harvest Mouse. 
Reithrodontomys megalotis Baird, Mamm. N. Am., p. 451 (1857). 
Type locality. — Between Janos and San Luis Springs, State of 
Sonora, Mexico (Dr. C. B. R. Kennerly). 
Measurements. — Total length, 5.75 ; tail vert., 2.45 ; hind foot, 0.45. 
Description. — (From a specimen taken at Cortez, Montezuma 
Co., April 6th) : Above yellowish brown, with but few of the blackish 
hairs found in the preceding species; feet and under parts, including 
tail, white ; tail above blackish. In specimen at hand distinguished 
from R. nehrascensis principally by lighter color without blackish 
hairs. 
Distribution. — This species has been recorded from Mexico, 
Arizona, New Mexico, Texas, Utah, and Colorado. There are only 
two records for Colorado at present, Grand Junction, Mesa County, 
and Cortez, Montezuma County. 
Habits. — Little is known about its habits, but they are 
probably similar to those of the preceding species. My 
specimen from Cortez was taken among rocks. 
Reithrodontomys montanus. Mountain Harvest Mouse 
Reithrodontomys montanus Baird, Proc. Acad. Nat. Sci. Phila., 
p. 335 (1855). 
Type locality. — San Luis Valley, probably in Saguache County, 
but possibly on the northern edge of Costilla County, Colorado 
(Kreutzfeldt). 
Measurements. — (Type from Baird): Total length, 4.2; tail 
to end of hairs, 2.0 ; hind foot, 0.5. Specimen in Warren Collection 
from Crestone: total length, 5.6; tail vert., 2.43; hind foot, 0.5. 
Description. — Color above very similar to that of the common 
house mouse, but somewhat more fulvous; a rusty spot at anterior 
base of ear; beneath dull white with pale buffy tinge or wash on 
throat and between fore legs; the fulvous along the sides is almost 
