586 Mr. O. Thomas on certain of 



between the species, M. americana, for example, having 

 generallj a naso-premaxillary articulation, while the species 

 now described as M. zetta has not. The preorbital pits are 

 fairly deep in M. rufina and hricenii, shallow in all the other 

 species. I may note that a fine male specimen of M. hricenii, 

 recently received, is considerably larger than the typical 

 female, its skull having a condylo-basal length of 168 ram. 

 The following forms appear to need description : — 



Mazama zetta, sp. n. 



A brown species related to M. americana. 



Size about as in M. americana, but form rather stouter. 

 General colour rufous brown, browner and less rufous than in 

 americana. Head distinctly brown, with indistinct rufous 

 markings above and below eyes and on sides of muzzle. 

 Ears brown, their bases below whitish. Chin and inter- 

 ramia dull whitish. Neck brown, the hairs along the whole 

 centre of its upper side reversed (in all three specimens 

 available). Body dark rufous brown above, becoming more 

 rufous posteriorly. Chest and belly rufous brown, the extent 

 to which the brown is tinged with rufous varying considerably. 

 Limbs dark brown, paler rufous on their internal aspect 

 proximally, darker rufous terminally. Tail dark rufous 

 brown above, white below. 



Skull shorter and more stoutly built than that of M. ameri- 

 cana. Premaxillse shorter than in that species, often falling 

 far short of the nasals, and only rarely just reaching them. 



Upper tooth-row of the type, a small subadult female, 

 60 mm. 



Dimensions of fully adult male and female skulls 

 (85. 4. 22. 6 and 8) :— 



Condylo-basal length 187, 190 mm.; zygomatic breadth 

 96, 95 ; length of nasals 60, 62 ; interorbital breadth 42, 46 ; 

 gnathion to front of anterior premolar 63, 63; palatal length 

 124, 121 ; breadth between outer sides of w^ 65, ^&', upper 

 tooth-row 60, 61. 



Hah. Medellin, Antioquia, Colombia. 



Type. Young adult female. B.M. no. 78. 8. 31. 3. Col- 

 lected by Mr. J. K. Salmon. A stuffed specimen, two skins, 

 and seven skulls examined. 



This beautiful little Deer was determined by Sir Victor 

 Brooke as M. rufina, Pucheran, but there is no doubt that 

 that is a mountain form allied to M. hricenii. M. zetta, on 

 the other hand, is a representative of M. americana, from 

 which it differs by its stouter form, browner colour, shorter 



