Mar. 1898. NORTH AMERICAN MAMMALS ELLIOT. 209 



The examples in this great series show a considerable degree 

 of variation, as might be expected, caused by difference of sea- 

 son, age and individual peculiarities. Were only a few examples 

 from some localities available, it is not unlikely that new species 

 or subspecies might be created. Certainly not a few have been, 

 which exhibited less differences from other known forms than is 

 observable in this series. The Portola specimens were procured 

 from December to March; those from Alum Rock Park in May, 

 from Mt. Hamilton in June, from Snow Mountains in Septem- 

 ber and October, from Pyramid Peak in July, and from Silver 

 Lake in June and July. 



The Portola examples are in the winter pelage, and are gen- 

 erally darker than the others, while the summer specimens from 

 the interior and eastern part of the State are gray, certain ones 

 with much rufous on the upper parts and flanks, more like 

 the post-breeding pelage observed in Tamias. While the indi- 

 viduals from the interior are generally of a paler hue, they 

 can be matched by those from the coast, and there seems to be 

 no reasons for establishing even a separate race among them. 

 The present collection extends the range of the species consid- 

 erably, from the extreme east to the western borders of the state, 

 and through a greater part of the central portion from north to 

 south. 



The extreme style of coloring, viz. : the entire upper parts 

 deep rufous, of specimens from Hermit Valley, Calaveras Co., 

 resemble so exactly those of JP. t. sonoriensis from Woodford, 

 Alpine Co., and Mt. Siegel, Douglas Co., Nevada, on the other 

 side of the Sierras, that it is impossible to separate them, and it 

 would seem that among these mountains the two subspecies run 

 together and insensibly grade into the typical style of gambelii 

 on the coast. 



34. Peromyscus texanus sonoriensis. 



Hesperomys sonoriensis. Leconte, Proc. Acad. Nat. Scien., 

 Phila., vol. vi., 1853, p. 13. 



Three hundred and twenty-nine specimens from the following 

 localities: Woodford, Alpine Co., 52; Mt. Siegel, Douglas Co., 

 Nevada, lower slopes, 245 ; Anderson Ranch, Douglas Co., 17; 

 Winters Mines, Douglas Co., 15. 



The examples of this large series are of the ashy gray color of 

 typical sonoriensis, but there is considerable variation observable, 

 and some of the extreme individuals are not to be distinguished 



