Four new South- American Maminah. 219 



The skin on which this species is founded is that men- 

 tioned under ^^ JLsperomi/s {Ilabrothriw) xanthorhinus^^ in 

 my account of the 'Ah'it' culk-ctions (P. Z.S. ISf^l, p. 5). 

 Tliat dt'tciinination was based mainly on the spirit-specimen 

 referred to at the same time, which is undoubtedly a true 

 Alcodon { = Hithruthrij-). A comparison of the skulls now 

 shows not only that the two, like as they arc externally, are 

 dilferent as species, but that the Monteith Bay skin belongs 

 to the Oxymycterus group, as is especially shown by its 

 narrow slanting zygoma-root, slender muzzle, and broad 

 brain-case. In that group no species as yet described bears 

 any resemblance to it. 



Dasyprocta Kalinowshit, sp. n. 



Size rather large. Fur ringed with black and yellowish 

 rufous, the elongated hairs of the rump white with black 

 tips, contrasting markedly with the rest of the body. Area 

 round the root of tail black, abruptly defined from the white 

 crest-hairs. Under surface yellowish, grizzled with brown. 

 Feet blackish. Tail about an inch in length, naked. 



Skull elongate, not unlike that of D. variegata and fali- 

 gtnosa, but with the muzzle rather broader and more trumpet- 

 shaped. 



Dimensions of the type, an adult male : — 



Head and body (measured in flesh by collector) 6*30 

 millim. j hind foot 125. 



Skull : basilar length 89, greatest breadth 54 ; nasals 

 46 X 22 ; interorbital breadth 33'5 ; diastema 30 ; upper 

 molar series 20"5. 



Ilab. Idnia, Valley of Santa Ana, Cuzco, Peru. Alt. 

 4600 ft. Coll. J. Kalinowski, Nov. 2, 1894. 



This handsome Aguti may be readily distinguished from 

 any species hitherto described by the peculiar coloration of 

 its long rump-hairs, which, white with black tips, are quite 

 unlike tiiose of any other species. 



It was obtained by, and is named in honour of, Mr. J. 

 Kalinowski, the well-known Polish collector, to whom 

 science is already indebted for the discovery of so many 

 interesting Peruvian mammals. 



Peramys adustus, sp. n. 



Size small. Fur close and short, only about 4 millim. long 

 on the back. Colour all over above uniform finely grizzled 

 brown, with a slight yellowish tinge ; tip of muzzle blackish. 

 Under surface coloured about as in Mus musculus ; line of 

 demarcation on sides little marked. Ears very short, prac- 

 tically naked. Hands and feet greyish brown, digits naked. 

 Tail practically naked, its few fine hairs black. 



