210 Mcrrlajii — The Chipmunks of the Gcnas Eutamias. 



or no snow. Tlie timber in tlie caiion was composed mainly of yellow 

 jiines {Piii.as poadcrosa scopulonun), which formed a belt extending at least 

 1,000 feet above the altitude of camp. On the north side of the canon 

 I'inits moiioplijilla and Juniperus californica utahensis were the characteristic 

 trees and here reach their highest altitude, owing to the effects of slope 

 exposure. 



"The chiiinnmks were abundant during tlie warm part of the day, run- 

 ning along the logs and in open spaces on the sunny nortli side of the 

 canon. Nearly all the specimens were taken within a mile of camp. On 

 the loth of February an ascent was made of tlie main ridge northwest of 

 Charleston Peak, but no chipmunks were seen more than 1,000 feet above 

 the camp, doubtless owing to the snow and cold." 



Eutamias dorsalis utahensis subsp. nov. Utah Cliff Chipmunk. 



Ti/pe from Ogden, Utah. No. till, cf fid., Merriam Collection. Col- 

 lected by Vernon Bailey Oct. 9, 1888. Original No. 289. 



Genevdl cliaracters. — Similar t(j E. dorsullj!, but slightlj' smaller and paler, 

 W'ith all of the mai'kings less distinct, i)articularly the post-auricular 

 patches and facial stripes ; underside of tail fulvous instead of rufous. 



Color. — ■ Winter pelage: Upper parts hoary buff, darker on the top of the 

 head, which is grizzled from the admixture of rusty hairs, suffused with 

 pale fulvous on the sides ; post-auricular spots small, indistinct, and pale 

 buffy ; dorsal strijjes nearly obsolete, the median only being noticeable 

 in ordinary lights ; facial stripes distinct, but pale and ))allid contrasted 

 with those of typical doi^saUs ; under side of tail fulvous, bordered with 

 black and edged with yellowish. 



Summer pelage : Similar, but paler and more hoary from bleaching of 

 the old hairs. In the young all of the strijjes are distinct. 



Cranial cJiaraeterx. — The skull of sul)sitecies atahevais differs from that of 

 typical dors(dis in smaller size, conspicuously shorter rostrum, and smaller 

 teeth. The length of the nasal b(nies is conspicuously shorter than the 

 combined length of the Inisioccipital and basispheuoid. In E. dorsalis 

 the length of the nasals equals or exceeds the occipital-sphenoid length. 



Meeisuremevts of tijpe specimen (taken in Hesh). — Total length, 220; tail 

 vertebra', 97; hind foot, 33. Ear from notch, 16 (in dry skin). Average 

 of 10 specimens from ty])e locality: total length, 223.6; tail vertebrie, 

 102; hind foot, 32.9. 



General remarks. — The type .specimen of 'Tainias dorsalis' 

 Baircl * came from the Silver mines in the Mirabres or Piiios 

 Altos Mountains, about tlie sources of the Gila River in western 

 New Mexico. INfr. Clark P. Streator was sent to the type local- 

 ity late in November, 181J2, and obtained 17 specimens in fres?i 

 winter i)ehv.fe. The contrast between these specimens and the 



*Tamias dorsalis Baird, Troc. Acad. Nat. Sci., Phila., VII, 332, 1855. 



