1913] Grinnell-Swarth: Birds and Mammals of San Jacinto 377 



Our one specimen (male, no. 2167) probably represents the 

 form occupying the San Jacinto region above the Sonoran zone. 

 Its features in comparison with arizom nsis from northern 

 Nevada, have been commented upon at length by Taylor (1911, 

 p. 299). We now have for comparison four summer adults from 

 the Mount Whitney region of the extreme southern Sierra 

 Nevada. The San Jacinto animal is closely similar to these, but 

 slightly paler, especially in the brownness of the head, and is 

 somewhat smaller. It measures, length 328 mm., tail vertebrae 

 113, hind foot 37. 



There is very great variation among all the California speci- 

 mens of this species in extent of facial white markings; for 

 instance, one example (no. 16272, female, Monache Meadows. 

 8000 feet, Tulare County) has as much white on the cheeks and 

 between the eyes as the extreme of Mush hi xanthogi nys. It does 

 not appear that good characters are to be sought in this direction, 

 but rather in size, proportions, and general tone of coloration. 



C. H. Merriam (1896, p. 25) has suggested that M. xantho- 

 genys seems to grade into arizom nsis up the mountains. If this 

 be true (though not shown by our rather limited material) 

 then arizonensis of San Jacinto Peak might be considered nearest 

 related to xanthogi nys of the adjacent lowlands of southern Cali- 

 fornia — in fact merely a mountain form directly derived from 

 that species, and not to be thought of as an isolated colony of a 

 species having its nearest relative on the high southern Sierras. 

 The same material lends itself equally to the two theories. Be- 

 cause of parallel distribution among other mammals of the two 

 regions in question, however, we lean to the latter notion. 



San Jacinto Peak is the southernmost station for arizonensis 

 in California. 



Sorex ornatus C. H. Merriam 



Adorned Shrew 



Found only in Strawberry Valley, 6000 feet, and Tahquitz 

 Valley, 8000 feet. Four specimens were trapped (nos. 2090, 

 2149-2151), the first in the former locality, July 18, and the last 

 three in the later locality July 20, 25 and August 1. All are 

 adults in summer pelage, and fairly typical of ornatus. 



