19(5 Merriam The Chipmunks of the Genus Eutamias. 



Butamias senex (Allen). Allen's Chipmunk. 



General characters. Tail rather short, narrow, and pale fulvous under 

 neath and at base of hairs on upper side ; under parts white in both 

 pelages ; ear stripes and post-auricular spots sharply defined and con 

 spicuous; general color of upper parts in winter pelage gray, in summer 

 fulvous, except on head and rump; outer pair of light stripes whitish, 

 inner pair grizzled grayish, in post-breeding pelage obscured anteriorly 

 by fulvous ; top of head and rump grizzled grayish in all pelages, only slightly 

 more fulvous in post-breeding pelage ; ant-orbital part of middle facial 

 stripe only slightly marked ; sides efface never suffused with yellowish ; 

 dark dorsal stripes obscured by fulvous, the black showing through, par 

 ticularly on the median stripe. 



Range. The Sierra-Cascade system from Farewell Bend on the Des 

 Chutes River in Oregon south to the headwaters of the Merced River in 

 Yosemite National Park. In Oregon senex follows the east slope of the 

 Cascade range down to base level, being common at Fort Klamath, as 

 well as at similar elevations farther north. It occurs also at the Paulina 

 Lakes, in the Paulina Mts., which range is connected with the main body 

 of the Cascades by continuity of Boreal forest. The species was found 

 at Prospect, in the Upper Rogue River Valley, and is common also in the 

 Siskiyous along the boundary between Oregon and California. In the 

 Sierra Nevada of central California it is confined to high altitudes, and 

 does not approach base level on either slope. East of the Sierra proper, 

 in Lassen Co., it inhabits the Big Valley Mts.* 



Eutamias hindsi (Gray). Hinds' Chipmunk. 



General characters. General coloration redder than in any other mem 

 ber of the tmvnsendi series ; under parts white, except in post-breeding 

 pelage, when they are faintly washed with fulvous ; ear stripes and post- 

 auricular spots fairly well denned, more conspicuous than in merriami, 

 but much less conspicuous than in lownsendi or ochrogenys ; general color 

 of upper parts in winter pelage grizzled grayish and dull fulvous ; in sum 

 mer pelage intense ferruginous anteriorly and on sides, becoming pale 

 posteriorly. In winter pelage the dark dorsal stripes, except the median 

 one, are obscured by fulvous, but in post-breeding pelage there are always 

 three distinctly black dorsal stripes, and in some specimens the black 

 shows through in the external lateral stripe. The outer light stripe is 

 whitish, more or less suffused with yellowish in summer pelage ; in winter 

 pelage it is bluish gray. In winter pelage the fulvous is most marked on 

 the lateral dark stripes which enclose the outer pair of light stripes, so 

 that the striped effect is much more pronounced in winter pelage than in 



*The form from the Big Valley Mts. differs from typical senex in hav 

 ing the post-auricular patches and outer pair of light stripes much whiter. 

 It is evidently not an intergrade between senex and quadrimaculatus, but 

 may be regarded as an incipient subspecies, not yet requiring a name. 



