134 The Mammals of Colorado 
Measurements. — Total length, 6.8; tail vert., 3.5; hind foot, 0.8. 
Description. — (From a specimen taken in western Montezuma 
Co., April 9th): Hair long and silky; above bright buff or tawny, 
lightest on the sides and flanks, a slight admixture of black hairs in 
the dorsal region. Feet and under parts white, except yellow spot 
on breast between fore legs. Tail with distinct pencil; upper part 
quite dark. Very different from any of the other Colorado deer-mice. 
Recognized by the yellow breast spot. 
Distribution. — The Golden-breasted Deer-mouse has been taken 
in southeastern Utah, northeastern Arizona, New Mexico, and 
Colorado. In the latter State it has been met with in Montezuma, 
Montrose, Mesa, and Garfield counties. The most northeastern 
record is a specimen taken by myself in the Grand River Canon, 
about twelve miles above Glenwood Springs. It does not seem 
to range much, if any, higher than 7,000 feet elevation, and as it 
lives exclusively among rocks, its distribution all through this 
area is no doubt rather spotted. Grand Junction is the most 
northern point on the west boundary of the State from which there 
is a record at present, but probably it will be found north of that 
point. 
Habits. — This species, like all the big-eared deer -mice, 
lives almost exclusively in rocky places, where it makes its 
home among the holes and crevices in the rocks. Its food 
and other habits seem to be the same as those of the other 
species already described. 
Peromyscus boyleii rowleyi (boyleii for Dr. C. C. Boyle; 
rowleyi for C. P. Rowley, who took the type 
specimens). Rowley's Deer-Mouse. 
Sitomys rowleyi Allen, Bull. Am. Mus. N. H., v., p. 76 (1893). 
Type locality. — Nolan's Ranch, San Juan Co., Utah. 
Measurements. — Total length, 7.25; tail vert., 3.6 ; hind foot, 0.8. 
Description. — (From a specimen taken at Cortez, Montezuma 
Co., April 6th): Above, brown, dorsal region with many black and 
a few white hairs intermixed. Upper surface of the tail like the 
back. Feet and under parts white. Distinguished from next 
species by shorter ear, which measures 0.8 in the dry skin. 
Distribution. — Rowley's Deer-mouse has been recorded from Utah, 
Colorado, Arizona, New Mexico, western Texas, and southern 
California; Lower California, and south in Mexico along the Sierra 
Madre to central Zacatecas. In Colorado it has been taken in 
