10 



unc. lin. 

 Longitudo ab apice rostri ad caudrc basin. ... 53 



cttudčc 3 5 



tarsi digitorumque 1 H 



• — auris O 95 



Hab. Bolivia, near Potosi. 



The most striking features of this species are the large size of its 

 ears, combined with its delicate ochre-yellow colouring. It is ap- 

 parently a stout-bodied animal, and has long and soft fur, which on 

 all parts of the body is of a deep slate-grey colour next the skin ; on 

 the under parts each hair has the outer haif ■vvhite ; on the sides of 

 the body the visible portions of the hairs are ochreous, obscurely 

 tinted -vvith rufous on the rump : the hairs on the back are similarly 

 coloured, but they are brown at the point, and many of them are 

 blackish. The feet are •white, but slightly sufFused with yellowish ; 

 the tail is well-clothed for a mouse, vvhite beneath, and of a pale 

 yellow colour above ; the eyes are margined \vith brown ; the ears 

 are clothed with small pale yellow hairs intemally, and the hairs on 

 the outer surface, which are much longer, are of a rūsty yellow hue. 

 The hairs of the moustaches are numerous and very long, some of 

 them vvhite and some black. The incisor teeth, \vhich are narrow 

 in proportion to the animal, are of a very pale orange colour. The 

 fore-feet are small ; the tarsi moderate. 



The Hesperomys Boliviensis, in the large size of its ears, mušt ap- 

 proach the Mus auritus of Desmarest ; but judging from the descrip- 

 tion of that animal, it should difFer in being of a larger size, in having 

 the tarsi shorter in proportion, and its colouring mušt be very dis- 

 similar, the M. auritus being described aa of a grey hue. — G. W. 



