196 Merricmi — The Chipmunhs of the Genus Eatamias. 



Butamias senex (Allen). Allen's Cliii)nmnk. 



Geiu'val diararfcrs. — Tail rather short, narrow, and pale fnlvons 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- 

 si)icuous; general color of upper parts in winter pelage gray, in summer 

 fnlvons, exce])t on head and rum]); outer pair of light stripes whitish, 

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

 by fulvous; toj>of head and runip grizzled grayish in all pelages, onlyslightly 

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

 stripe only slightly marked ; sides of face never suffused with yellowish ; 

 dark dorsal stripes obscured l)y 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 INIerced River in 

 Yosemite National Pai'k. 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 noi'th. It occurs also at the Paulina 

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

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

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

 Siskiyons along the boundary between Oregon and California. In the 

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

 does not ap})roach base level on either slope. East of the Sierra proi)er, 

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



Eutamias hindsi (Gray). Hinds' Cbipnuink. 



General cJiaraclers. — General coloration redder than in any other mem- 

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

 pelage, when they ai'e faintly washed Avith fulvous; ear sti'ii)es and post- 

 auricular spots fairly well defined, more cons])icuous than in merri<(.mi, 

 but nuicli less conspicnous than in toiviisendi or ncJirogengs ; general color 

 of upi^er parts in winter pelage grizzled grayish and dull fulvous ; in sum- 

 mer i)elage 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 stri|)e. The outer light stripe is 

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

 ])elage 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 senez in hav- 

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

 It is evidently not an intergrade between seue.r and qaadrirnaculalas, but 

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



