The Chipmunks of the Genus Eutamias. 209 



General characters. Eutamias palmeri resembles E. dorsalis in size and 

 in the pallid grayish color of the upper parts in winter pelage, but differs 

 in having the stripes more distinct, and in other particulars. In size it 

 agrees very well with typical quadrivittatus, though the body is a little 

 larger and the tail a little shorter, but it differs radically from quadrivit 

 tatus in coloration, resembling panamintinus much more closely, though 

 differing in having the upper side of the tail black, and in other respects. 

 Its real affinities are with the quadrivittatus group, as shown by cranial 

 characters. The ears are rather small. The dorsal stripes are short at 

 both ends, except the median one, which reaches the occiput. In the 

 clear gray of the neck it resembles the pigmy E. pictus. 



Color. Winter pelage : upper parts gray ; no fulvous on back of neck ; 

 flanks suffused with pale fulvous ; light stripes hoary gray, the outer pair 

 whitish ; the three dark dorsal stripes pale ferruginous, the middle one 

 blackish or umber along the median line ; outer pair of dark stripes obso 

 lete ; facial stripes faintly developed, the lower (cheek) pair failing an 

 teriorly ; post-auricular spots dull whitish and not well denned ; ear 

 stripes distinct, the posterior dull bluish-white ; the anterior dusky, 

 edged along the anterior base with fulvous ; feet grayish, faintly suffused 

 with fulvous. Tail : upper side black for three-fourths its length (the 

 base grayish), the extreme tips of the hairs on the base and sides (except 

 the terminal part which is solid black) yellowish ; under surface rufous, 

 bordered with black, and edged on the sides only with yellowish. 

 Summer pelage unknown. 



Cranial and dental characters. Skull slightly larger than that of quad 

 rivittatus, with larger audital bullre, and larger and heavier molar teeth , 

 both above and below. The lower premolar is longer and narrower an 

 teriorly than in quadrivittatus, and the last lower molar is broader. 



Measurements of type specimen (taken in flesh). Total length, 219; tail 

 vertebrae, 98 ; hind foot, 33. Average measurements of 13 specimens 

 from type locality : total length, 219.3 ; tail vertebrae, 93.4 ; hind foot, 33.3. 

 General remarks. Palmer's Chipmunk has one of the most restricted 

 ranges of any known mammal, being confined to the boreal summit of 

 Charleston Peak a lofty isolated mountain in southern Nevada. This 

 mountain is completely surrounded by arid deserts which prevent the 

 spread of the species as effectually as an ocean. Though Eutamias palmeri 

 bears points of resemblance to several species it is not closely related to 

 any. Still it was evidently derived from the quadrivittatus- speciosus stock. 

 The complete isolation of the mountain peak on which it lives sufficiently 

 explains its peculiarities. 



Dr. Palmer has given me the following memorandum respecting the 

 place where his chipmunk was obtained. He says : "Thirteen specimens 

 of this species were secured at an altitude of about 8,000 feet on the north 

 west side of Charleston Peak, where Mr. Nelson and I camped for two 

 days, Feb. 12-14, 1891, in the bottom of a deep east and west canon. At 

 this time snow lay on the ground to the depth of a foot or more in the 

 bottom of the canon and covered the upper parts of the main ridge of the 

 Charleston Mountains, but on the north slope of the canon there was little 



