282 On new Mammals from Bolivia. 



Ears of medium length, thickly hairy, blackish grey ter- 

 minally, more whitish grey basally, a lighter greyish patch 

 present behind their posterior bases. Under surface strongly 

 contrasted white, the bases of tlie hairs slaty, their tips snowy 

 white. Hands and feet wholly white above. Anterior claws 

 rather more elongate than in the allied forms. Tail about 

 equal in length to the body without the head, well-haired, 

 prominently bicolor, black above and white below for ita 

 whole length, except that the tip below is also blackish. 



Skull almost precisely similar to that of A. mollis; inter- 

 orbital region broad, its edges square, not ridged. Inter- 

 parietal quite minute. Palatine foramina reaching back 

 beyond the middle of m}. 



Dimensions of the type, measured in skin : — 



Head and body * 104 millim. ; tail 75; hind foot (wet) 20 ; 

 ear (wet) 13. 



Skull : back of interparietal to front of nasals 24' 2 ; 

 greatest breadth 13"o; nasals 13"6 x 3*2; interorbital breadth 5; 

 palate length from henselion LI ; diastema 6'9 ; palatal fora- 

 mina 6 X 2'1 ; length of upper molar series 4"1. 



Type B.M. no. 98. 3. 16. 7; original number 1695. 

 Killed 28th April, 1897. 



While as regards the skull this mouse can scarcely be 

 distinguished from A. mollis^ its colour is entirely different 

 both from that and every other known Akodon. 



1 have named this species in honour of Count von Berlepsch, 

 the eminent ornithologist, by whose assistance Mr. Garlepp 

 was enabled to make his explorations and through whose 

 courtesy the British Museum has been allowed to acquire the 

 mammals he collected. 



Cavia niata, sp. n. 



Size small, about as in C. aastralis. Fur of medium 

 length, the hairs 15-18 millim. long on the back. General 

 colour a peculiar pale yellowish buff, quite unlike that of any 

 other Cavy. Face, cheeks, hairs on and at base of ears more 

 whitish buff. Whole of under surface and anal area white, 

 with a slight buffy tinge, not sharply defined on the sides ; 

 bases of hairs pale slaty. Upper surface of hands and feet 

 also buffy white. 



Skull very peculiarly shortened and rounded, in exaggera- 

 tion of the characteristics of that of G. australis. Upper 

 profile very strongly convex, the muzzle bent down to an 

 unusual angle with the basicranial axis. Nasals short and 



* " Total length 175 millim." {G. G.). 



