THE NEOTROPICAL REGION 



77 



those confined within the limits of the whole Region ; (3) 

 the " American " genera, i.e. those occurring in other parts 

 of the New World, but not beyond ; and (4) the " Cosmo- 

 politan," i.e. those of general distribution : — 



Section VII. — The Patagonian Sub-region 



The Patagonian Sub-region may be most conveniently 

 taken to begin on the south side of the bay of Guyaquil, 

 and to extend thence southwards, embracing the whole 

 western slope of the Andes of Ecuador and Peru. In 

 Bolivia it widens out and includes the high plateau of 

 Titicaca, extending thence over the whole of the Argentine 

 Republic, Chili, and Patagonia. 



The most characteristic form of the mammals of this 

 Sub-region is the Lama, which, with its allies, consti- 

 tutes the genus Lama. Four forms, usually regarded as 

 distinct species, are recognised by naturalists. Of these 

 two, the Lama (L. peruana) and the Alpaca (L. pacos) 

 are only met with in a domestic state, and are very 

 variable in size and colour. Of the other two, which are 

 met with wild, the Guanaco (L. huanacos) has the most 



