ALLEN : MAMMALIA : MURID^. 



55 



This species was described by Waterhouse from a single specimen ob- 

 tained by Darwin at Bahia Blanca. It has since been recorded by Thomas 

 from Chubut, East Patagonia, and therefore must be included in the 

 present work. Mr. Waterhouse's description, in his account of the Mam- 

 malia of the voyage of the Beagle, is as follows : 



"General color pale yellowish brown, a tint produced by the admixture 

 of black and pale fawn colour; the hairs of the ordinary fur being of the 

 latter tint near the apex, and dusky at the apex, whilst the longer hairs 

 are black. The feet, tail and under parts of the body and sides of the 

 muzzle, are pure white. All the hairs of the body (which are soft, and of 

 moderate length), are deep gray at the base. The ears are of moderate 

 size, well clothed with hairs, of which those on the inner side are yellow- 

 ish, and those on the outer are brown on the anterior part, and white on 

 the posterior. A small tuft of white hairs springs from the neck immedi- 

 ately behind the ears ; this tuft is hidden when the ears are folded back. 

 The tail is slender and short (being not quite equal to the body in length) 

 of a pale flesh-colour, and sparingly furnished with minute white hairs. 

 The feet are very small and slender, and the naked parts are of a flesh- 

 colour. The sole of the foot is covered with hairs ; the toes beneath and 

 the tubercles (which are as in Miis Mnsat/its), however, are naked. The 

 hairs of the moustaches are of moderate length, and of a blackish colour, 

 some of them, however, are grayish white. 



Inches. Lines. [mm.] 



" Length from nose to root of tail 2 10 [53] 



Length of tail i 7 j-^qJ 



Length from no.se to eye o 4^ [5. i] 



Length from nose to ear o 84 [i c] 



Length of tarsus (claws included) o 6J [141 



Length of ear o 4| [9] 



" Habitat, Bahia Blanca (September)." 



Mr. Durnford {cf. Thomas, /. c.) refers to this species as less common 

 at Chubut than the other species of Eligmodontia found there, and that it 

 " makes its nest in a thick bush about a foot above the ground and of 

 grass torn into fragments." 



Eligmodontia griseoflava (Waterhouse). 



Mils [Phyllotis) gnseoflavus Waterhouse, P. Z. S., 1837 (Nov. 21, 1837), 

 28, Rio Negro. 



