Afammah from Bolivia. 129 



(Rio Sccnid) si(l(i of the watershed. Had lie done so they 

 would presumably have been of the G. amnzonicus type. 



7. Sciurus cuscinun, Thos. 



2 $ . Charuplaya, 1350 m. 8th to 22iid June, 1901. 

 Native name " Antara." 



8. Nectomys Garleppi, Thos. 



3 c? , 3 9 . Charuplaya, 1350 m. 21th May to 27th June, 

 1901. 



9. Oryzomys levipes, sp. n. 



Iinm. $ . Choro, 3200 m. 27th July, 1901. 



(Type from Limbane, Peru.) 



Allied to 0. Keaysi, Allen, but smaller. 



General appearance very much as in 0. Keaym', the fur of 

 the same quality, and the colour similar throughout except 

 that, at least in typical specimens, the under surface in 

 0. levipes is buffy, not defined on the sides, and in 0. Kenysi 

 dull whitish, defined laterally. But in this respect there is 

 considerable variation, and 1 do not lay much stress on the 

 distinction. 



Skull, as compared with that of a topotypical 0. Keaysi, 

 smaller and lighter throughout, as may be seen by the 

 measurements. Interorbital region narrow, finely beaded. 

 Palatal foramina large and widely open, extending back 

 almost to the level of the front of m^. 



Dimensions of the type : — 



Head and body 130 millim. ; tail 160 ; hind foot (s. u.) 31 ; 

 ear 27. 



Skull : greatest length 35"7 ; basilar length 28 ; zygomatic 

 breadth ]8"5; length of nasals 13'2 ; interorbital breadth 5 ; 

 breadth of brain-case 14:"2 j palate length lo'O; diastema 9*5 : 

 palatal foramina 6"5x3'3; length of upper molar series 6. 



Hah. Limbane, Dept. of Puno, S.E. Peru. Alt. 2200 m. 



Typ)e. Old female. B,M. no. 1. 1. 1.21. Original number 

 1132. Collected 6th July, 1900, by P. O. Simons. 



Of this smaller form of 0. Keaysi, also distinguished by its 

 large palatal foramina, the Museum possesses the type from 

 Limbane, a couple from Yuncas, N.W. Bolivia, '2,2{)\) m., a 

 young one from Astillero, Bolivia, 2700 m., and tlie imma- 

 ture skin in the present collection. The determination of the 

 last-named is a little doubtful, but it appears to be an example 

 in changing pelage. 



