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Vol. XXII, pp. 105-106 June 25, 1909 



PROCEEDINGS 



\ OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



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Lu L 

 A NEW CHIPMUNK FROM COLORADO. V^' 



BY EDWARD R. WARREN. 





In the spring of 1905 I collected a single specimen of a chip- 

 munk at Gaimie's Ranch, Shell Rock Canon, in the northwest 

 corner of Baca County, Colorado, which seemed to belong to an 

 undescrihed form. In April of this year (1909) I was success- 

 ful in collecting two more specimens of the same animal at 

 Irwin's Ranch, in Tp. 29 S., R. 52 W., Las Animas County, 

 Colorado, about twelve miles due west of the other locality. 



The region where these animals were found is at an elevation 

 of 5,000 feet and a little more, a sandstone mesa cut up by 

 many gulches and shallow canons, and covered with "cedar" 

 (juniper) and pinon trees; locally it is known as " The Cedars." 

 It is a very dry region, with practically no running streams and 

 but few springs and water-holes. Evidently as a result of this 

 dryness the colors of the animal are very pale and apparently 

 faded, but an examination of the pelage of the specimens shows 

 it to be practically unworn, and as the three at hand are quite 

 identical in color and other characteristics I have no hesitation 

 in describing it as a subspecies of Eutamias qtiadrivittatvs, to 

 which it is evidently closely allied, though differing much in 

 color. 



Eutamias quadrivittatus animosus 8ubsp. nov. 



LAS ANIMAS CHIPMUNK. 



Tyjye from Irwin's Ranch, Tp. 29 S., R. 52 W., Las Animas County, 

 Colorado (elevation 5,000 feet). No. 3428, collection of E. R. Warren. 

 9 adult. April 29, 1909. E. R. Warren. (This will be deposited in the 

 U. S. National Museum. ) 



Characters. — Size as in quadrivittatus, possibly a little larger. The 

 animal has a very pale rusty appearance, and the three specimens in my 

 15— Proc. Biol. Soc. Wash., Vol. XXII. 1909. (105) 



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