192 Merriam The Chipmunks of the Genus Eutamias. 



the southern High Sierra, and does not reach so far north as 

 Lake Tahoe. E. amcenus, on the other hand, is not found so far 

 south as Mt. Whitney, but begins apparently in the latitude of 

 Independence Creek, and ranges thence northward to British 

 Columbia. True speciosus seems to be restricted to the east crest 

 of the High Sierra and the San Bernardino and San Jacinto Mts. 

 on the other side of the Mohave Desert.* In the mountains about 

 Lake Tahoe it is replaced by a closely related form, E.frater, 

 which does not reach northern California. The large E. senex 

 begins near the headwaters of the Merced in the Yosemite Na 

 tional Park and extends northward over the Sierra and eastern 

 slope of the Cascades to a point in Oregon between latitude 44 

 and latitude 45, where it is replaced by townsendi. E. toivnsendi 

 continues northerly to British Columbia, and on the west side 

 of the mountains reaches southward nearly to Rogue River. 

 South of the mouth of Rogue River it is replaced by an allied 

 form, E. ochrogenys, which follows the coast southward almost to 

 San Francisco Bay. This form is restricted to the narrow coast 

 strip known as the ' redwood belt.' Immediately east of this belt 

 its range abuts against that of E. hindsi, which latter animal is 

 replaced in the coast ranges south of San Francisco Bay by the 

 allied E. merriami. E. merriami not only inhabits the coast ranges 

 from San Francisco Bay south to the Santa Ynez Mts., but pushes 

 on in a southeasterly direction along the San Gabriel. San Ber 

 nardino, and San Jacinto Mts. to the Cuyamaca Mts., and north 

 easterly by way of Mt. Pinos and Tehachapi Mt. to the west slope 

 of the Sierra, which it follows northward along the lower slopes 

 as far at least as the Yosemite National Park. 



2. SEASONAL CHANGES IN PELAGE. 



The seasonal color changes in the genus Eutamias are startling, 

 the difference in most species between the gray winter coat and 

 the ' red ' or bright golden-fulvous post-breeding pelage being 

 almost incredible. In fact, in some instances, the same animal 

 in different pelages has been named as two different species. 



Dr. J. A. Allen, in his elaborate and admirable paper on the 

 Chipmunks,! has pointed out the striking color change that takes 



* For interesting facts respecting the distribution of members of the 

 speciosus group, see pages 199-201. 



fBull. Am. Mus. Nat. Hist., New York, vol. Ill, No. 1, pp. 45-116, 

 1890. 



