CH. Il] TAPIRS AND EDENTATES. Ill 



the late Prof. Garrod showed to be most nearly related to 

 the " Courser " of the old world, is one of the most typical 

 of the sub-region. The Tinamou genus Calodromas, with 

 caeca unique in their complicated branching, is also 

 confined to the sub-region. Rhea is equally limited to 

 this part of the world, and there are numerous other 

 genera of birds belonging to many families, which exist 

 only in the Chilian sub-region. Among earthworms it 

 contains all or nearly all of the genera Acanthodrilus and 

 Microscolex; this group of animals offering one of the 

 best reasons for its separation. 



II. The Brazilian sub-region. This sub-region includes 

 all the forest region of South America and is practically 

 coextensive with the political division of the continent 

 known as Brazil. It reaches up to the sea on the north 

 and across the Andes on the west. The monkeys, Lago- 

 thrix, Brachyurus and Pithecia, are limited to this region, 

 which indeed contains nearly all of the arboreal animals of 

 South America. The Tapirs of the genus Tapirus are 

 found here only. The Great Anteater (Myrmecophaga), 

 the Sloth Bradypus and a few Armadillos are confined to 

 the sub-region. Among birds it has the isolated genera 

 Psophia and Eurypyga, besides innumerable genera be- 

 longing to the CotingidsB and other families. 



III. The Mexican sub-region. This sub-region is in 

 some respects intermediate between the rest of the Neo- 

 tropical and the Nearctic regions. It is not so rich in 

 peculiar types of South American animals as are either of 

 the sub-regions already described. There are however not 

 a few types entirely restricted to tropical Mexico. Among 



