SOUTH AND CENTRAL AUSTRALIA 191 



terminals at a, b, c. The species d is found in the 

 centre of the continent. 



The Rufous species is the western representa- 

 tive of the Brown species. The rufous seems to 

 be the result of the particular country acting on 

 the brown plumage! The young of the White- 

 throated species has its upper tail coverts rufous, 

 which entirely disappear with the next moult. 

 What is the relation to the rufous species? Can it 

 be the remnant of a sporadic migration from the 

 desert! The forest would have the tendency to 

 obscure its rufous and convert it into grey. In 

 some species, the young, the male parent and the 

 female all differ in colouration. 



In the Red-browed species it is the female that is 

 more beautiful in plumage than the male, a re- 

 vision of the sexual law in relation to colour. 



They have their food beats, travelling along a 

 line of trees in the morning, and returning in the 

 afternoon. 



PARROT-LIKE BIRDS AND THEIR RACES 



Anyone leisurely walking a hundred miles across 

 country will emerge from one forest with one type 

 of bird to enter another containing a race of that 

 species. 



He or she, may pass from the southern mallee to 

 the northern part of it, and there see a race of the 

 species previously seen. It is quite possible when 

 passing from the mainland to an island to find on it 



