154 On new small Mammals from South America. 



Skull : basilar length 46'3 ; occipito-nasal length 58'5 ; 

 greatest breadth 28-5 ; nasals 17 X 6*5 ; interorbital breadth 

 15 ; palate length from henselion 25 ; palatal foramina 6 x 1*8 ; 

 length of upper molar series (crowns) 12"8. 



Hab. Caicara, Orinoco. 



Type B.M. no. 98. 12. 1. 18. Original number 11039. 

 Collected July 2, 1898, by Geo. K. & Stella M. Oherrie. 

 Three specimens obtained, two adult and one young. 



This tine species may be readily distinguished from others 

 by the prominent white punctulation of the posterior back, 

 due to the broad white tips to the spines in that region. It 

 may prove to be most nearly allied to L. semivillosus, Geoff., 

 from Colombia, which has, however, the back " tiquete* de 

 jaune " and other differences. 



A bad skin, which has been in the Museum since 1852, I 

 also refer provisionally to L. punctatus. It was said to have 

 come from Caracas. 



Peramys brevicaudatus ortnoci, subsp. n. 



Much paler than in the typical form, coloured more nearly 

 as in P. dimidiatus. Fur short and velvety, about 5 millim. 

 long on the back. Upper surface from nose to rump pale 

 grey, near " olive-grey " or " smoke-grey " of Ridgway. 

 Sides of head and body ferruginous, this colour extending 

 from the bases of the whiskers along the sides of the head 

 and neck to flanks, and down to the wrists and ankles ; at 

 the anterior base of the ear it extends further dorsally than 

 elsewhere, so as to form a ferruginous patch on the head at 

 the back of the ear. Under surface pale buffy, not sharply 

 defined, the hairs dark slaty at their bases. Upper surface 

 of hands and feet blackish brown. Tail furry and dull 

 rufous for its basal half-inch above, the rest thinly haired, 

 blackish. 



Skull apparently not distinguishable from that of P. b. typicus. 



Dimensions of the type (a slightly immature male, measured 

 in the flesh by collector) : — 



Head and body 111 millim.*; tail 75*; hind foot s. u. 18; 

 ear 17. 



Skull: basal length 29; greatest breadth 17; nasals 145 x 5; 

 combined length of ms. 1 ' 2 5*8. 



Hab. Caicara, Orinoco. 



Type B.M. no. 98. 12. 1. 22. Collected Aug. 10, 1898, 

 by Geo. K. & Stella M. Cherrie. Original number 11100. 



* Judging by the skin, I should have considered the body rather 

 longer and the tail rather shorter than the above ; but I think it best to 

 accept Mr. Chenie's measurements as they stand. 



