Vol. XXII, pp. 23-28 March 10, 1909 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



ELEVEN NEW MAMMALS FROM LOWER CALIFORNIA. 

 BY E. AV. NELSON AND E. A. GOLDMAN. 



Among the mammals in the Biological Survey Collection 

 from Lower California, Mexico, are eleven undescribed species 

 and subspecies, all (>xcept one of which w^ere obtained by us 

 during our visit to the Peninsula in 1905-1906. The excep- 

 tion — a Bassarisrus — was collected by J. E. McLellan on San 

 Jose Island in the summer of LS9o. 



These descriptions are j)ublished in advance of our report on 

 the mammals of the Peninsula now in course of preparation. 



Eutamias merriami meridionalis snbsp. nov. 



LOWER CALIFORNIA CHIPMUNK. 



Ti/jic from Aguaje de San Estel)an, about 25 miles northwest of San 

 Ignacio, Lower California, Mexico (altitude about 1,200 ft.). No. i;)U,597, 

 U. S. National Museum, Biological Survey Collection. $ adult. Collected 

 October 5, 1905, by E. W. Nelson and E. A. Goldman. Original number 

 18,268. 



General characters. — Most nearly related to E. m. obscurus but smaller 

 and grayer. 



Color of type (sliglitly worn October j^elage). — Top of head grizzled 

 gray tinged with brownish and bordered by brownish line; markings on 

 sides of liead as in obscurus, Ijut paler; median dorsal stripe dull rusty 

 brownish, becoming blackish on posterior tliird and obsolescent on 

 rump; middle pair of dark stripes rusty brownish, similar to anterior half 

 of median stripe; outer pair of light stripes pale whitish gray; inner pair 

 of light stripes darker gray ; sides of body between fore and hind legs pale 

 dingy huffy; entire rump and outer sides of hind legs pale grizzled gray, 

 much paler than in obscurus and differing little from general shade of 

 back; fore and hind feet and front of forelegs pale grayish, with slight 

 tinge of dull Imlfy; top of tail blackish, washed with pale huffy gray; 

 black on tail underlaid l)y a huffy basal zone; middle of underside of tail 

 bright rusty rufous, bordered by black with an outer margin of gray. 



Skull. — Distinctly smaller and slenderer than in either merriami or ob- 

 scurus; zygomatic arches compressed, thus accenting general narrowness 

 2— Proc. Biol. Soc. Wash.. Vol. XXII, 1909. (23) 



