232 
JOURNAL OF MAMMALOGY 
TWO NEW RODENTS FROM OREGON AND NEVADA 
By E. a. Goldman 
Golden-mantled chipmunks representing the various geographic 
races of Callospermophztus lateralis (Say) occur throughout most of 
the higher mouhtains of the western United States, and outlying forms 
reach Canadian and Mexican territory. A readily distinguished sub- 
species appears to be isolated on the upper slopes of the Charleston 
Mountains, southern Nevada. These mountains are completely 
surrounded by Lower Sonoran deserts which are doubtless effective 
barriers limiting the distribution of this species and responsible for 
the differentiation noted. 
This chipmunk and a heretofore undetected form of one of the rarer 
kangaroo rats, Perodipus microps, are characterized as follows: 
Callospermophilus lateralis certus subsp. nov. 
NEVADA GOLDEN-MANTLED CHIPMUNK 
Type from Charleston Peak (north base), Charleston Mountains, Nevada. 
No. 208891, cf adult (teeth slightly worn), U. S. National Museum (Biological 
Survey Collection), collected by Luther J. Goldman, June 29, 1915. Original 
number 2270. 
Distribution. — Known only from the Charleston Mountains in southern 
Nevada. 
General characters. — Distinguished by pale general coloration in combination 
with dark russet under side of tail; most closely allied to C. 1. trepidus, but ground 
color paler, the under side of tail however, of a dark, rich russet, instead of 
ochraceous-buff or ochraceous-tawny tone. Similar in color to C. bernardinus 
but paler and cranial characters distinctive. 
Color (summer molt nearly complete). — Head, neck and shoulders between 
tawny and ochraceous-tawny, varying in intensity but tending to become paler 
on sides of neck and shoulders, more or less mixed with grizzled gray or pre- 
senting a patched appearance during the molt; median dorsal area grizzled gray- 
ish brown becoming darker on rump; inner black stripes broad and distinct; 
flanks light grayish; underparts whitish or dull grayish, the dark basal color of 
hairs showing through; throat and chin ochraceous-buffy in some specimens; 
feet dull whitish, or pale buffy; tail above mixed black and ochraceous-buff 
changing to grizzled grayish brown near base, below rich russet interrupted by 
a narrow black lateral line and ochraceous-buffy edging. 
Skull. — Closely resembling that of C. 1. trepidus, but slightly smaller and 
lighter, with narrower ascending branches of premaxillse, and rather narrow 
basioccipital. Compared with C. 1. chrysodeirus and C. bernardinus the nasals 
are more wedge-shaped, narrower posteriorly and nearly conterminous with 
premaxillse (usually extending posteriorly well beyond premaxillse in chrysodeirus 
and bernardinus). 
