44:2 On a new Cotton-tail from Colomhia. 



same general ])lan, but tlie ground-colour is dark grizzled 

 grey, which, however, is only present on the anterior two- 

 fliirds of the body, the liead and rump deep chestnut-rufous. 

 Dorsal lines almost obsolete, the median one rej)reseiited by 

 segments of a few millimetres on the nose and nape and an 

 ill-defined line on the ])03terior back ending level with the 

 hips ; the outer lines only about an inch in length, ill-defined 

 and scarcely perceptible. Under surface soiled greyish, the 

 ends of the hairs drabby white. Cheeks, like crown, rich 

 rufous ; chin pale rufous. Hands brown. Feet with the 

 outer side of the metatarsus brown, inner dull whitish ; digits 

 naked. Tail brown above, lighter below. 



Skull not so flattened as in iheringi, more of the general 

 shape of that of americana, the brain-case comparatively high 

 and rounded. 



Dimensions of tiie type (measured on a spirit-specimen) : — 



Head and body 80 mm.; tail 36; hind foot 14; 

 ear 10. 



Skull : greatest length 25*2 ; condylo-basal length 25 ; 

 zygomatic breadth 13*5; nasals 10x3*8; interorbital 

 breadth 5'4 ; palatal length 14-5; maxillary tooth-row 107; 

 three anterior molariform teeth 4*6. 



Hah. Theresopolis, Organ Mts., Brazil. 



Type. Adult female. B.M. no. 21. 8. 6. 2. Received 

 in exchange from Prof. J. P. Hill. 



This pretty little species is readily distinguishable from 

 M. ihsringi by its rufous iiead and rump, its greyish fore- 

 back, and its obsolescent dark dorsal lines. 



XLV. — A new Cotton-tail (Sylvilagus) from Colomhia. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 

 The British Museum owes to Fr^re Niceforo Maria of 

 JMedellin an example of a fine Sylvilagus which seems to be 

 different from any described species. It may be called 



Sylvilagus nicefori^ sp. n. 



A member of the short-eared group, the tail almost obsolete. 



Fur fairly soft, htiirs of back about 23-25 mm. in length. 



General colour dark, mixed buffy and blackish, the buffy 

 comparatively pale, not strong and ociiraceous. Sides paler 

 buffy. Under surface dull whitish anteriorly, dull buffy 

 posteriorly, the hairs slaty at base. Forehead and nape 

 buflfy ociiraceous, tiie na[)e-patcli extending beyond the ends 

 of the short ears. Proectote blackish, slightly suffused with 



