LÖNNBERG, ON SOME MAMMALS FROM THE ARGENTINE CHACO. 5 



Tlie hind legs are broadly coloured with dark brown in the 

 tarsal tract, and this extends on the posterior side down on 

 the metatarsus, the frontside of which is, however, rufous 

 like the toes down to the hoofs. 



The tail is rufous like the back above, white below. 



The hoofs of the hind legs measure along the upper 

 ridge 30,5 mm. in length, and the breadth from the upper 

 ridge proximally across the upper or lateral surface to the 

 outer lower margin is 18,5 mm. 



Mazama nifa rosii n. subsp. 



A male signed: »Gama: Gu^ Guazu colorado. Ind. Ca- 

 hita. 1. 



Chaco Austral. Rio de Oro. Rep. Arg. April 1896. 

 A. Ros.»; and a young female with the same signature except 

 for the sex. 



The great size of this race is jDroved b}^ the following 

 eranial measurements. 



Total length of skull 227 mm. 



Condylobasal length 213 >> 



Occipitonasal length 200 » 



Preorbital length 119,6 » 



Zygomatic breadth 97,S » 



Occipital (mastoid) breadth 74,5 » 



Least interorbital breadth 50,3 » 



Breadth of braincase öG » 



Least vertical distance betvveen lower orbital brim and alveolar 



margin of m' 32,6 » 



Maxillary tooth row (mueh worn !) 02,5 » 



Ratio of preorbital to condjdobasal lengtli 56 "o 



Length of nasals 77,2 mm. 



Breadth of nasals 29,9 » 



Breadth of skull across posterior end of premaxillaries .... 35,8 » 



Greatest breadth of m' (much worn) 16 » 



» » » m^ > » 14,5 » 



Diastema of lower jaw 57,8 » 



Gnathion to front of anterior premolar 71,5 » 



