130 Proceedings of the Biological Society of Washington. 



Penasco Creek at various points from 6 to 12 miles east of Cloudcroft and 

 from 7000 to 8000 feet altitude, in the yellow pine zone. Four of these 

 are adults, and six are young of the year, nearly full grown but still in 

 immature pelage. 



Remarks. — In cranial characters this chipmunk shows so little similar- 

 ity to E. operarius, its apparently nearest relative, that I have given it 

 full specific rank. A thorough revision of the genus may show some 

 other species to which it is more nearly related, but its range is widely 

 separated from that of any other small species and it occupies the same 

 ground with the much larger E. canipes. 



Eutamias cinereicollis cinereus subsp. now 



Type from the Magdalena Mountains, New Mexico (alt. 8200 feet), in 

 Copper Canyon. No. 167,029, c? ad., U. S. National Museum, Biological 

 Survey Collection. Collected by E. A. Goldman, September 1, 1909. 

 Original number, 20,435. 



General characters. — Similar to cinereicollis but much paler and grayer, 

 the rufescent areas not only lighter colored but more restricted ; crown, 

 shoulders and rump clear ashy gray; w T hite of belly clearer and more 

 extensive; hind feet pale huffy; dorsal stripes, I! black, 2 gray and 2 

 white, broad, clear and sharply defined. 



Measurements of tyjie, taken in the flesh by collector: Total length, 

 225 ; tail vertebrae, 91 ; hind foot, 33. Average of three other males from 

 type locality, 224; 93; 33.6. Skull of type : Greatest length, 35.7 ; basal 

 length, 30; nasals, 9.5; zygomatic breadth, 19.4; alveolar length of 

 upper molar series, 5.6. 



Specimens examined. — From the type locality, 5; from the San Mateo 

 Mountains, 6. 



Remarks. — Series of specimens of cinereicollis from the Mogollon and 

 Mimbres Mts. show a slight tendency toward this pale gray form but are 

 not sufficiently marked to be referred to it. From canipes on the east it 

 differs more than from cinereicollis on the west, the feet being less gray 

 and the general coloration far more grayish. 



Callospermophilus lateralis arizonensis subsp. now 



Type from San Francisco Mts., Arizona, No. sfffl) <? a ^-> t T - S. National 

 Museum, Biological Survey Collection. Collected August 8, 1889, by 

 C. Hart Merriam and Vernon Bailey. Original number, 308. 



General characters. — Larger and richer colored than C. lateralis, with 

 under surface of tail of adults dull gray at all seasons. 



Color. — In post-breeding or late summer pelage, upperparts brownish 

 gray with broad black and buff stripe along each side; head and shoulders 

 suffused with golden chestnut; rump and hams with deep chestnut shad- 

 ing to yellowish and to buffy on feet; belly huffy or soiled whitish. 

 Winter pelage much duller and grayer, with but a trace of vinaceous 

 chestnut over head and rump. Tail gray, scarcely lighter below than 

 above. Young. — Similar to adults but often with 2 black strijjes on each 



