128 The Mammals of Colorado 
C. Ears very large; their length quite equal to or exceeding their 
distance from tip of nose. Tail distinctly pencilled, 
about equal to half the total length. 
a. Fulvous, rather grayish above. Ears larger, about 0.95. 
P. truei, p. 135 
b. Darker above, mixed blackish and grayish with dull fulvous 
ground color. Ears smaller, about 0.8. P. nasutus, p. 136 
Peromyscus maniculatus rufinus (Lat. rufus, reddish). 
Tawny Deer-Mouse. 
Hesperomys leucopus ritfiiius Merriam, N. A. Fauna, No. 3, p. 65 
(1890). 
Type locality. — San Francisco Mountain, Arizona (altitude 9,000 
feet). 
Measurements. — Total length, 6.3 ; tail vert., 2.75 ; hind foot, 0.78. 
Description. — (From specimen taken at Crested Butte, Oct. 19th) : 
Above tawny brown, darkest on dorsal region, brightest on sides 
of flanks ; white at base of ear ; upper surface of tail blackish ; feet and 
all under parts white. The color varies much, and may be much 
darker than the specimen from which the description was drawn 
up, and the differences seem to be independent of sex, season, or 
locality. The color of the dark portion of the tail may vary from 
that of the body to quite black. 
Distribution. — The Tawny Deer-mouse is found in eastern Arizona, 
eastern Utah, Colorado, and New Mexico. Its range in Colorado 
may be defined as follows: from the eastern foot-hills of the Conti- 
nental Divide, and from west of the Pike's Peak Range, west to the 
Utah line, and from the north to the south boundary of the State, 
excepting that in most of Routt and Rio Blanco, and western Gar- 
field and Mesa counties it is replaced by P. nehrascensis. The 
following list of localities shows its distribution better than it can 
be described otherwise: Canadian Creek, Pearl, Rabbit Ear Mts., 
Estes Park, and Long's Peak, Larimer County; Boulder, Nederland, 
and Gold Hill, Boulder County (these are all noted by Osgood as 
approaching nehrascensis); Black Hawk, Gilpin County; Golden, 
Jefferson County; Mt. McClellan, Clear Creek County; Grand Lake, 
Sulphur Springs, Kremmling, Coulter, Sheephorn Pass and Whiteley, 
Grand County; McCoy and AUenton, Eagle County; Toponas and 
Elkhead Mountains, Routt County; Mud Springs, White River 
Plateau, 12 miles above Glenwood Springs, and Rifle, Garfield 
County; Debeque, Mesa County; Boreas Pass, Summit County; 
Tarryall Creek, above Puma City, Park County; Irwin, Crested 
Butte, Almont, Muddy Creek and Sapinero, Gunnison County; 
