MAMMALIA. 47 



moustaches are rather short and slender, and of a brownish colour. Thumb 

 nail small and rounded. 



Length from nose to root of tail 

 of tail 

 from nose to ear 



In. 



Lines. 





3 



9 



Length of tarsus 



4 



1* 



of ear 



1 









In. Lines. 



u 



Habitat, Maldonado, La Plata, (June.) 



This species is slightly larger than the common mouse; the head is rather 

 larger in proportion ; the ears are rather smaller and more distinctly clothed with 

 hair ; the tail and tarsi are much longer in proportion. Its bright yellow colouring 

 and proportions distinguish it from any of the species described in this work. Of 

 this animal I do not possess the skull, nor of the teeth do I possess more than the 

 first and second molars of the upper jaw, and the second and last of the lower 

 jaw. These are figured in Plate 34, figs. 5. a, and 5. b. 



Mus Magellanicus. 



Plate XIV. 

 Mus Magellanicus, Bennett, Proceedings of the Zoological Society of London for December 1835, p. 191. 



M. supra fuscus, subtiis cinerescenti-albus, pallideflavo lavatus ; auribus mediocribus 

 pilis fuscis obsitis ; cauda corpus caputque cequante; tarsis longis, pilis sordide 

 albis obsitis. 



Description.— Fur very long and moderately soft, general colour deep brown; 

 the hairs of the ordinary fur are gray, tipped with yellowish brown ; the 

 longer hairs are black ; the sides of the body are yellowish ; the under parts 

 are gray-white with a faint yellowish tint, each hair being gray tipped with 

 yellowish white. The ears are rather small, well clothed with hairs ; those on 

 the inner side are blackish tipped with yellow, and on the outer side they are 

 blackish on the fore part and dusky on the hinder part. The fore feet are of 

 moderate size, the thumb nail is short and rounded ; the tarsi are rather 

 long ; both fore and hinder feet are of a brownish colour, and covered above 

 with dirty gray hairs. The tail rather exceeds the head and body in length ; 

 it is brown above and dirty white beneath. The hairs of the moustaches are 

 numerous and long, of a brownish colour at the apex and black at the base. 



