40 Mr. O. Thomas on some small 



III. — On some small Mammals from the District of Cuzco, 

 Peru. By Oldfield Thomas. 



The British Museum has received a small collection of 

 mammals obtained in the district of Cuzco by Herr Otto 

 Garlepp, brother of the Herr Gustav Garlepp to whom 

 science is indebted for the discovery of the remarkable 

 mammals from Sahama, Bolivia, described in the ' Annals ' 

 for April 1898 *. 



In the present series there are examples of Cebus albifrons, 

 Lagotlirix Humboldti, a species of Myotis, Sturnira lilium, 

 Putorius macrurus, JDasyprocta isthmica, Rhipidomys leuco- 

 dactylus, Oryzomys Stohmanni, Akodon caliginosus, and of the 

 four following new forms : — 



Sciurus 03stua?is cusci?ius, subsp. n. 



Allied to the form of the S. aistuans group described by 

 Gray as " Macroxus irroratus " f from specimens brought by 

 Bartlett from the Ucayali River, probably from near Sara- 

 yacu. Similar in size, dorsal coloration, and other characters 

 to that animal, but distinguished by its much brighter and 

 more sharply defined under surface, which is a bright yellowish 

 buff throughout, except on the chin and throat, which are 

 whitish. The extreme bases of the belly-hairs are slaty, but 

 this does not show on the surface. Feet becoming more 

 yellowish terminally, the digits, both anterior and posterior, 

 deep orange-yellow. Yellowish ear-patches well-marked. 

 Tail-hairs orange or ringed orange and black for their basal 

 halves, their tips dull orange with a subterminal band of black. 



Skull as in S. irroratus, but with much shorter nasals, 

 which are very considerably surpassed posteriorly by the 

 prem axillary processes. One upper premolar. 



Dimensions of the type (an adult male, in skin) : — 



Head and body (c.) 205 millim. ; tail (c.) 180 ; hind foot 

 s. u.J (wet) 46 ; ear (wet) 20. 



Skull: basilar length 36*1; greatest breadth 28-4; nasals, 

 length (diagonally) 12*2 ; palate length from henselion 19*6 ; 

 diastema 11'6 ; length of upper tooth-series 73. 



Bab. Ocabamba, Cuzco. 



Type B.M. no. 98. 11. 6. 8. Collected by Herr Otto 

 Garlepp, Nov. 1, 1897. 



* Ann. & Mag. Nat. Hist. (7) i. p. 277 



t Ann. & Mag. Nat. Hist. (3) xx. p. 431 (1867). 



% s. u.=sine ungue. 



