GEOGBAPHICAL EELATIONS Or BIEDS. 24 1 



It is made up of six subregions, very imperfectly defined as 

 yet:— 



I. The Fatagonian subregion, or Tierra del Fuego and the 

 Continent thence northwards to a little north of Bahia Blanca 

 on the East coast, and a line running thence north-west, east of 

 Mendoza to the Andes ; also aU the higher slopes of the Andes 

 to north of the Equator, and the land west of the Andes from 

 about Truxillo southwards, including the island of Chiloe and 

 the other islands back to Tierra del Fuego. 



II. The Brazilian subregion, or the Continent east of the last 

 subregion to Potosi, and thence north-east, south and east of 

 the watershed of the Amazons, to the mouth of the Paranahyba. 



III. The Amazonian subregion iucludes the basin of the 

 Amazons as far west as the tributary of it named the Huallaga, 

 from the mouth of which its boundary passes obliquely and 

 irregularly to the mouth of the Orinoco. 



IV. The Peruvian region, consisting of the lands interrening 

 between the Andes and the Brazilian and Amazonian regions, 

 together with the rest of the Continent north of Truxillo 

 and the Oriaoco, the Galapogos Islands and those of Trinidad 

 and Tobago, 



Y. The Gentral-American subregion, or the region from the 

 Isthmus of Panama to the boundaries of the Nearctic region. 



VI. The Antillean region, or the West Indies excluding 

 Trinidad and Tobago. 



The AUSTRALIAN region is made up of Australia, Tas- 

 mania, and New Zealand, with the Moluccan Archipelago, up 

 to and including the island of Lombock, with Celebes and the 

 islands of the Pacific to the Sandwich Islands in the north. 



It is divisible into four sabregions : — 



I. The Papuan subregion, or New Guinea and all the islands 

 belonging to this region, as far as and including Celebes, 

 New Ireland, and the Solomon Islands. 



II. The Proper Australian subregion, or Australia and Tas- 

 mania. 



in. The Polynesian subregion, or the islands from New Cale- 

 donia, Fiji, and the New Hebrides to the Society and Sandwich 

 Islands. 



IV. The New-Zealand subregion, or New Zealand with the 

 Norfolk, Chatham, Auckland, and Macquarie Islands. 



The number of species which migrate and the extent of their 

 migrations may appear to oppose a great difficulty to the group- 



B 



