Vol. XVIII, pp. 233-236 December 9, 1905 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF APPARENTLY NEW SPECIES AND 



SUBSPECIES OF MAMMALS FROM MEXICO 



AND SAN DOMINGO. 



BY D. G. ELLIOT, F. R. S. E. etc. 



With one exception all the species described in this paper 

 were obtained in Mexico l)y the collectors for the Field Colum- 

 bian Museum, INIessrs. Heller and Barber. The Phyllovj/cteris 

 has been in the museum collection for several years, but failing 

 to obtain more examples it is now described in hopes that at- 

 tention may be drawn to it and more specimens thereby pro- 

 cured. * 



Tamias nexus sp. nov. 



Ti/pe from Coyotes, Duiango, Mexico. Field Columbian Museum. Col- 

 lector's No. 4293. 



General, cliaraclers. — Darker generally than either T. bulleri or T. dur- 

 arig.'c. Liglit dorsal stripes reddish not gray ; rump and thighs much 

 darker; light face stripes not so pure white; underparts mostly plumb- 

 eous on sides and belly, not white, and middle of tail beneath chestnut, not 

 buff nor ochraceous buff as in the two forms named above. 



Color. — Top of head iron gray, black stripe from nose above eye nearly 

 to ear, and one from nose to eye, becoming dark chestnut behind eye to 

 ear ; yellowish white stripe from nose between the black ones becoming a 

 narrow line above eye and a broader one beneath eye; broad chestnut 

 stripe from nose across cheeks to beneatli ear. Grayish white imtches be- 

 hind ears ; back of neck, shoulders, flanks, upper side of arms from wrists 

 and thighs to ankles dark gray tinged on shoulders and flanks with yel- 

 lowish ; median black dorsal stripe from head to root of tail bordered on 

 either side with a rufous and gray stripe, followed by a blackish chestnut 

 stripe, succeeded by an outermost stri])e of ocliraceous, the outermost of all 

 being dark chestnut. There are thus five dark stripes and four lighter ones, 

 the middle pale ones being so tinged with red as to give the dorsal region 

 a chestnut hue. Rump rufous; underparts from chin to and including 

 breast white, remainder plumbeous with a whitish line through center of 

 abdomen. Tail above black edged with white, beneath chestnut bordered 

 with black and edged with white, tip black also edged with white. Hands 

 48— Prog. Biol.. Soc. Wash., Vol. XVIII, 1905. (233) 



