4 University of California Publications in Zoology [ Vou. 17 
7000 feet. These localities all he in either the Canadian Zone or the 
upper part of the Transition Zone. 
Remarks.—The form here described is the southernmost and palest 
representative of the amoenus group, occurring on the arid crest and 
east wall of the central Sierra Nevada, where it is characteristic of the 
Canadian Zone. Specimens from Independence Lake, Nevada County, 
indicate intergradation toward true amoenus. Measurements of total 
length, tail and hind foot, as tabulated by us (in MS), show no 
significant differences. 
Fifteen topotype specimens of Eutamias amoenus amoenus, taken 
in the vicinity of Fort Klamath, Oregon, and loaned to us from the 
collection of the United States Bureau of Biological Survey, through 
Mr. E. W. Nelson, are in pelage comparable with our Mono series. 
These proved invaluable for demonstrating the differences distinguish- 
ing the race here newly named. é 
Eutamias merriami mariposae, new subspecies 
Mariposa Chipmunk 
Type.—Female adult, skull and skin, in full winter pelage; no. 
21855, Mus. Vert. Zool.; El Portal, 2000 feet altitude, Mariposa 
County, California; November 24, 1914; collected by Walter P. Taylor; 
original no. 7099. 
Diagnosis—Sinilar to Eutamias merriami merriami in correspond- 
ing pelage, but general tone of coloration grayer, less brownish; dorsal 
pair of light stripes with ashy predominating; rump less brownish; 
sides much grayer, with but a trace of the ochraceous-buft of merriami; 
tail darker, the dorsal hairs banded and tipped with buffy white. 
Material—Fifteen specimens from the Upper Sonoran and low 
Transition zones of the west flank of the central Sierras of Cal- 
fornia: Madera County: Raymond, 940 feet; Mariposa County ;: three 
miles east of Coulterville, 3200 feet; El Portal, 2000 feet; Yosemite 
Valley, 4000-5000 feet. 
Remarks —The series at hand consists of specimens in either fresh 
or worn winter pelage, with but two exceptions. One of these excep- 
tions, a juvenal, as compared with merriama of the same age, is 
decidedly paler and grayer, but not quite so gray as juvenals of 
kernensis. The other exception, our only specimen showing summer 
(post-breeding) pelage, is practically indistinguishable from merriami 
in the same coat. It is thus quite different from the grayish kernensis, 
though the tail is the same. 
