CHAPTER XVIII. 
THE DISTRIBUTION OF THE FAMILIES AND GENERA OF BIRDS, 
Order I. — PAS8ERES. 
Family 1. — TUKDIDiE. (21 Genera, 205 Species.) 
General Distribution. 
Neotropical 
Sob-regions. 
N E ARCTIC 
Sub-regions. 
Pal^: arctic 
Sub-regions. 
Ethiopian 
SUB-REGION3. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
1 . 2 . 3 . 4 
1 . 2 . 3 .4 
1 . 2 . 3. 4 
| 1 . 2 . 3.4 | 
1 . 2.3 4 
1 . 2 . 3 - 
The extensive and familiar group of Thrushes ranges over 
every region and sub-region, except New Zealand. It abounds 
most in the North Temperate regions, and has its least develop- 
ment in the Australian region. Thrushes are among the most 
perfectly organized of birds, and it is to this cause, perhaps, as 
well as to their omnivorous diet, that they have been enabled to 
establish themselves on a number of remote islands. Peculiar 
species of true thrush are found in Norfolk Island, and in the 
small Lord Howes’ Island nearer Australia ; the Island of St. 
Thomas in the Gulf of Guinea has a peculiar species ; while the 
Mid- Atlantic island Tristan d’Acunha, — one of the most remote 
and isolated spots on the globe, — has a peculiarly modified form 
of thrush. Several of the smaller West Indian Islands have 
also peculiar species or. genera of thrushes. 
The family is of somewhat uncertain extent, blending insensibly 
with the warblers (Sylviidse) as well as with the. Indian bulbuls 
