200 Merriam The Chipmunks of the Genus Eutamias. 



known to occur are San Jacinto, San Bernardino, Mt. Pinos, the 

 Inyo and White Mts., and the High Sierra. The type locality 

 of the species is Mt. San Bernardino, and the typical form occurs 

 also on San Jacinto Peak, and on the eastern crest of the southern 

 part of the High Sierra in the neighborhood of Mt. Whitney. 

 Owing to the high altitudes it inhabits, its range is nowhere con 

 tinuous except in the High Sierra. 



Curiously enough, the northern form in the Sierra (neighbor 

 hood of Donner and Lake Tahoe) differs very appreciably from 

 typical speciosus and may be known as subspecies frater (Allen). 



The form from the White and Inyo Mts. is also subspecifically 

 separable and may be known as inyoensis nob. 



The form inhabiting the summit of Mt. Pifios is still different 

 and may be known as subspecies callipeplus (Merriam). A closely 

 related form, differing so little that it is included under the same 

 name, inhabits the western crest of the southern Sierra. 



In studying the distribution of these Chipmunks it is interest 

 ing to observe that with the single exception of Mt. Pinos the 

 mountains which encircle the west end of the Mohave Desert are 

 too low to furnish a home for any member of the group, so that 

 the colony of subspecies callipeplus inhabiting Mt. Pinos is sepa 

 rated widely not only from the nearest colony of typical speciosus, 

 but also from the nearest part of the range of the Sierra colony 

 of its own subspecies. 



Recapitulating, it appears that there are four forms of speciosus 

 which seem worthy of recognition by name : (1) speciosus proper, 

 inhabiting the San Jacinto and San Bernardino Mts. and the 

 eastern crest of the High Sierra from Olancha Peak and Mt. 

 Whitney northward an unknown distance, but not reaching the 

 headwaters of the San Joaquin river; (2) callipeplus, inhabiting 

 the summit of Mt. Pinos and the western slope of the Sierra from 

 the headwaters of Tule river northward nearly to the Yosernite 

 Valley; (3) inyoensis, inhabiting the higher parts of the Inyo 

 and White Mts., and (4) frater t inhabiting the higher parts of 

 the main Sierra in the Lake Tahoe region of central California. 



It is difficult to understand why there should be three recog 

 nizable forms within a distance of 150 miles in the Sierra Nevada 

 while two of these forms reappear on isolated mountains 100 and 

 150 miles south of the southernmost limit of their ranges in the 

 Sierra. This seems the more remarkable since in the Sierra the 



