MAMMALIA. 



ii"> 



the base, broadly annulated with pale cinnamon yellow near the apex, and 

 brownish at the apex ; the hairs of the belly are deep-gray at the base, and 

 white externally, those on the throat are pale gray at the base. 



In. Lines. 

 Length from nose to root of tail . .60 



of tail 4 9 



from nose to ear . . . I 4| 



Habitat, Coquimbo, Chile, {May.) 



In. LiDes. 



Length of tarsus (claws included) . .1 *2 



of ear . . . • . llj 



Width of ear 1 0J* 



This species is evidently allied to the two preceding ; and perhaps the " Rat 

 quatrieme, ou Rat oreillard" of Azara, {Mus auritus, Desm.) will form one of this 

 little group. The molar teeth of the upper jaw are figured in Plate 34, fig. 17, a — 

 those of the lower jaw, fig. 17, b. 



" Inhabits dry stony places." — D. 



26. Mus Galapagoensis. 



Plate XXIV. 



M. supra fuscus, flavo-lavatus, ad laterajlavescens, subtiis albus : pedibus pilis sordide 

 albis tectis : auribus mediocribus ; cauda, quoad longitudinem, caput corpusque fere 

 cpquante : vellere longo. 



Description. — Ears moderate, slightly pointed; tarsi moderate; tail slender, 

 nearly as long as the head and body ; fur long, and not very soft ; upper 

 parts of the body of a brownish hue, a tint produced by the admixture of 

 black and palish yellow hairs ; on the sides of the body the longer black 

 hairs are less abundant, -and the prevailing colour is yellow ; under parts of 

 the body white, with a very faint yellow tint ; feet furnished above with dirty 

 white hairs ; ears rather sparingly clothed with hairs, those on the inner side 

 of a yellow colour, and those on the outer side dusky ; tail above brown, and 

 beneath whitish ; the hairs of the moustaches black ; the incisors deep yel- 

 low ; the hairs on the back are deep gray at the base, broadly annulated with 

 palish yellow near the apex, and blackish at the apex ; the longer hairs 

 black ; on the belly the hairs are gray at the base, and broadly tipped with 

 yellowish white. 



* It is not easy to measure the width of the ears in these animals : upon measuring with a thread over the 

 curve of the outer side I have found the width of the ears of the present animal to be as above given,—the 

 dimension slightly exceeding that stated in the Proceedings of the Zool. Soc. 



K 



