210 Merriam The Chipmunks of the Genus Eutamias. 



or no snow. The timber in the canon was composed mainly of yellow 

 pines (Pinus ponderosascopulorurn), which formed a belt extending at least 

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

 Pinus monophylla and Jumperus calif ornica utahensis were the characteristic 

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

 exposure. 



" The chipmunks were abundant during the warm part of the day, run 

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

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

 the 13th of February an ascent was made of the 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. 



Type from Ogden, Utah. No. f||f, $ ad., Merriam Collection. Col 

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



General characters. Similar to E. dorsalis, but slightly smaller and paler, 

 with all of the markings less distinct, particularly the post-auricular 

 patches and facial stripes ; under side 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 stripes nearly obsolete, the median only being noticeable 

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

 with those of typical dorsalis ; 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. Tn the young all of the stripes are distinct. 



Cranial characters. The skull of subspecies utaJiensis differs from that of 

 typical dorsalis in smaller size, conspicuously shorter rostrum, and smaller 

 teeth. The length of the nasal bones is conspicuously shorter than the 

 combined length of the basioccipital and basisphenoid. In E. dorsalis 

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



Measurements of type specimen (taken in flesh). Total length, 220; tail 

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

 of 10 specimens from type locality: total length, 223.6; tail vertebrae, 

 102 ; hind foot, 32.9. 



General remarks. The type specimen of ' Tamias dorsalis' 

 Baird,* came from the Silver mines in the Mimbres or Pinos 

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

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

 ity late in November, 1892, and obtained 17 specimens in fresh 

 winter pelage. The contrast between these specimens and the 



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



