The Chipimmks of the Genus Eittamias. 209 



Gcti.cr(tl <-li<nncters.—En(amia.H paltiicri resembles E. dorsalis in size and 

 ill the i)allid grayish color of the upper parts in winter j)elage, but differs 

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

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

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

 txUiis in coloration, resembling panamirdmus much more closely, though 

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

 Its real atHuities are with the quadrlrlttutm group, as shown by cranial 

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

 both ends, exc-ept the median one, which reaches the occiput. In the 

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



Color. — Whiter 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 defined; 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 (excei)t 

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

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

 Summer i^elage unknown. 



Cranicd and denial characters. — Skull slightly larger than that of quad- 

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

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

 teriorly than in qiuulrlvittatits, 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, 219.8 ; tail vertebrpe, 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 

 sjjread of the species as effectually as an ocean. Though Eatamias pcdmeri 

 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 chii)munk 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 camj^ed for two 

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

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

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

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



