Muiit mala f ram I'cru and Bolivia. \^6 



Oxi/tnt/cterus I'n's^ sp. n. 



Size rather less than in 0. inca, Thos. General colour 

 nifous, heavily lined with black, es|)ccially along the middle 

 of the back, so that the dorsal area is noticeably darker than 

 the sides, which are a clearer fulvous rulous. Black tips of 

 dorsal hairs with a distinct greenish iridescence. Head 

 browner. Under surface ochraceous rufous, not sharply 

 defined laterally from the rutbus of the sides; chin whitish. 

 Ears, upper surface of hands and feet, and whole of tail 

 black, or a lew whitish iiairs on the terminal part of the tail 

 below. 



ISkull, as compared to that of 0. inca, with the nasals more 

 pointed and less trumpet-shaped anteriorly and more rounded 

 posteriorly. Brain-case slightly broader and shorter and 

 without any indications of rudimentary postorbital processes. 

 Back of palate level with middle of 7».\ Incisors narrower 

 and weaker than in O. inca. 



Dimensions of the type (taken in the flesh) : — 

 Head and body 160 millim. ; tail 102; hind foot, s. u. 30, 

 c. u. 33 ; ear 2'2. 



Skull: greatest length 37 ; basilar length 29; breadth of 

 nasal opening 3"5; nasals 14*5 x -I'S ; interorbital breadth 

 6*5; breadth of brain-case 15 ; palate length from heuselion 

 14'5 ; diastema 9*7; palatal foramina 8 1x3-4; length of 

 upj;er molar series 5*7. 



Hab. San Ernesto, near Mapiri, Upper Beni Kiver. Alt. 

 lOuO m. 



2)/jjc. Male. B.M. no. 1. 1. 1. 76. Original number 

 121«. Collected 5th .September, 1900, by Mr. B. O. Simons. 

 Eleven specimens examined, three from San Ernesto and the 

 others from Mapiri itself. 



From Dr. Allen's O.Juliacw this species differs by having 

 its underside coloured exactly as in 0. inca. The latter 

 again diflers by having its rufous darker and more chestnut 

 in tone and spread more unitbrnily over the body, so that the 

 back is little darker than the sides; nor is there any irides- 

 cence in the dorsal hairs. The cranial differences have already 

 been referred to. 



Oxymycterus viinnis^ sp. n. 



A member of the group ol small Alcodon-\\)n.^ Oxyinycteri^ 

 the nearest ally being (J. boyolenni.f^ Thos. 



Ciencial appearance that of the common small Akodons, in 

 colour intermediate between A. caliyino.iun und A. boliviensia. 



