LÖNNBERG, ON SOME MAMMALS FROM THE ARGENTINE CHACO. 1 1 



Condylobasal length 170 min. 173,5 mm. 



Preorbital length 87 » 89,5 » 



Zygomatic breadth 78,4 » 80,5 >■ 



Interorbital breadtli 41 » 42,3 » 



Occipital breadth 50,3 > öl » 



Least vertical distance between orbital biim and 



alveolar margin of m- 2'2,5 » 24,5 ^- 



Breadth of braincase ö7 » 50 



» between outer sides of m- ö4 » 57,5 » 



Maxillary tooth row (56)55 » (57,6)50.4 ; 



Greatest length of nasals 56 » 51 » 



» breadth of nasals 21 » 21 » 



Breadth of skull across posterior end of pre- 



maxillaries 24,7 » 29 » 



Greatest breadth of m- ll.S > 11,8 ^^ 



Diastema of lower jaw 38,7 » 38,4 » 



Gnathion to front of anterior premolar .... 53,4 » 56.S » 



Length of antler from the burr 90,5 » — 



Diameter of pedieel 13,6 » — 



The premaxillaries do not reach the nasals, but are not 

 far from them in the male. 



The following description is based on the skin of the 

 female, which I consider as the type, because the skin of the 

 male does not exist. 



The general colour of the upper parts is a rather light 

 grey brown which partly gets its peculiar shade from faint 

 subapical light rings to the hairs, This general colour al- 

 though more greyish bears a certain resemblance to Ober- 

 THtJR & Dauthénay's »snuff-brown» (Rép. de Coul. 303 

 between i and 2). The upper parts of the neck are more 

 grey, somewhat resembling »otterbrown» (354,2). The hairs 

 of the upper neck are not reversed, but there is a whirl 

 between the ears on the occiput. The lengthened hairs on 

 the forehead are more brown, somewhat resembling a light 

 shade of »raw umber» (Oberthur & Dauthénay 301, 1). 

 Anteriorly it blends into the dark brown of the upper parts 

 of the nose the colour of which perhaps might be said to 

 be between »chocolate» (343,2) and »warm sepia» (305, 1). 

 The sides of the head are paler and might be compared with 

 the palest shade of »otterbrown» (354, 1), a little more buff- 



