13S ^Ir. O. Thomas on 



breadth 12-7; length of nasals 10; interorbital bieailth 5-2; 

 breadth of brain-case 12 ; palate length 10*7 ; diastema 7*2 ; 

 palatal foramina 6*2 ; upper molar series 4. 



JIah. as above. 



7\pe. Old female. Original number 1437. Collected 

 lOtli May, 1901. 



This species is much darker than the other members of the 

 present group, though not so d-^rk as A. caliginosus. From 

 A. lutescens, Allen, the onlv allied species whose type 1 have 

 not examined, it may be distinguished by its broader inter- 

 orbital region. It is probably a southern representative of 

 A. 7)wllis, while A. pncijicus is equally a northern represen- 

 tative of A. olivaceus. It has a close external resemblance 

 to Oxymycterus mimus, but its zygoma-root is as in typical 

 Akodun. 



22. AJcodon caliginosus ^ Tome.'. 



4 (J, 5 ?. Charuplaya, 1350 m. 22nd May to 2nd Julv, 

 1901. 



23. Akodon hacchante, sp. n. 



(J. Choro. 2nd May, 1901. 



Allied to A. puJcherrimus, but with rufous points. 



Size and general cliaracters as in A. piilc/ierrtmus, the fur 

 of similar length and thickness, a white patch present behind 

 the ear, and the line of demarcation on sides similarly high. 

 Fur of back 10 to 12 millim. in length. General colour above 

 olivaceous grey, about as in A. p. cruceri, uniform on back 

 and sides. Underside sharply defined wliite, the hairs dark 

 slaty basally, white terminally. Muzzle, ears, metacarpals, 

 hind feet, and upperside of tail bright fulvous, similar to the 

 small patch on the sides of iha muzzle m A. pulcherrimus. 

 On the head the fulvous covers the whole of the nose and 

 surrounds the eye, fading off on the crown into the general 

 greyish colour. Visible part of ears bright fulvous, especially 

 basally ; a white patch on the side of the neck behind each 

 ear, and of about its size, so as just to he covered by it when 

 folded back ; the patch, as in A. p. cruceri, widely separated 

 from the white of the lower surface. ]\Ietacarpal3 lulvous, 

 fingers white. Under surface of tail whitish, and a narrow 

 line along its terminal half black, but the greater part of the 

 upper surface fulvous. 



k>kull broken in the only specimen, but apparently very 

 much as in A. puJchtrrimus. Nasals long and narrow, 

 l^alatal foramina extending to the middle of m\ 



