DISTRIBUTION IN SPACE 139 



various parts of the Neotropical Region. The 

 Chaparral Cocks and allied birds (Neomorphinae) 

 are found in Sub-tropical North America, and 

 in Borneo and Sumatra. The American Cuckoos 

 forming the fifth sub-family (Diplopterinae) range 

 between Mexico, Ecuador, and Brazil. The Anis 

 (Crotophaginae) are also peculiar to the New 

 World, ranging from the Southern United 

 States over most parts of the Neotropical Region. 

 Cuckoos are most abundant in the Oriental or 

 Indian Region ; whilst the complete isolation of 

 the American species is significantly reflected 

 in the exceptional number of peculiar genera. 



With a brief glance at the distribution of the 

 Passeriformes, we shall bring our review of 

 avine dispersal to a close. As an order we may 

 safely describe it as absolutely cosmopolitan. Its 

 representatives are found in every clime from 

 the ice-bound Arctic Regions to the torrid zone ; 

 there is scarcely an island that does not boast a 

 Passere of some kind. As a group these birds 

 dominate the earth ; in the grand scheme of 

 evolution the present era is particularly theirs. 

 If, however, the present order is cosmopolitan, 

 the various families that compose it are by no 

 means so widely dispersed. Among the most 

 cosmopolitan families may be mentioned the 



