The Chipmunks of the Genus Eutamias. 207 



Post-breeding pelage: upper parts fulvous, brightest and richest on sides, 

 becoming paler and duller on rump ; dark dorsal stripes much redder than 

 in winter pelage, the median one only showing any clear black ; inner 

 pair of light stripes also suffused with fulvous ; outer pair grayish ; face 

 (sometimes including nose), anterior and inner part of ears, under parts, 

 and fore and hind feet strongly suffused with fulvous. 



Measurements. Type specimen: total length, 261; tail vertebrae, 113; 

 hind foot, 38. Average of 8 specimens from type locality: total length, 

 263 ; tail vertebrae, 115.5 ; hind foot, 38.5. Average of 18 specimens from 

 Cazadero and Gualala, California: total length, 260.5; tail vertebrae, 

 111.6; hind foot, 38.5. 



Remarks. In post-breeding pelage E. ochrogenys assumes a fulvous 

 pelage, which while differing conspicuously from the corresponding pelage 

 of hindsi is very much more like hindsi in worm spring pelage. In fact, 

 except for the dates on the labels it would be hard to tell from the color 

 whether certain specimens were the redwood Chipmunk in post-breeding 

 pelage or hindsi in spring pelage. Of course the post-breeding pelage is 

 fresher and less worn, and carries with it a salmon-fulvous suffusion on 

 the belly which is much less extensive in hindsi. In some specimens of 

 hindsi in summer pelage the fulvous of the sides washes across the belly, 

 but this wash is much less extensive and less intense than in the redwood 

 animal. There is also a difference in the color of the upper parts, although 

 this is sometimes hard to be sure of. The post auricular patches are 

 whiter than in hindsi, and the inner pair of light stripes are more strongly 

 suffused with yellowish. All of the stripes are shorter posteriorly, so 

 that the unmarked area of the rump is more extensive than in hindsi. 



Contrasting specimens in corresponding pelage, there is no difficulty in 

 separating the two animals. E. hindsi in summer pelage is a very red 

 Chipmunk, and the upper parts, particularly from the back of the neck 

 to the lumbar region, are very bright rich fulvous. In hindsi, moreover, 

 in post-breeding pelage the three dorsal dark stripes are black, and even 

 the external lateral stripe is distinctly marked, though washed with 

 fulvous. In the redwood animal the dark stripes are never black, and 

 the external lateral stripe is nearly obsolete. 



Eutamias oreocetes sp. nov. Timber-line Chipmunk. 



Type from timber-line near Summit, Teton Mts. [main range Rocky 

 Mts.], Montana. No. 72468, $ ad. (nursing). U. S. Nat. Mus., Biological 

 Survey Coll. Collected June 14, 1895, by Vernon Bailey. Grig. No. 5024. 



General characters. -In spring pelage similar in color and general ap 

 pearance to Eutamias minimus and alpinus, which very distinct species 

 bear a surprisingly close seperficial resemblance to one another ; dorsal 

 stripe longer, broader, and blacker than in either minimus or alpinus, in 

 this respect resembling the larger affinis in spring pelage. 



Color. Type in spring pelage [= left-over winter pelage] : upper parts 

 gray with a buffy yellowish suffusion on flanks and on side of neck just 

 in front of foreleg ; post-auricular spots whitish ; top of head grizzled 



