i9i8.] 



Platycercine Parrots of Australia. 



125 



Throughout the series the colour-pattern is unchanged, 

 although the colour itself has undergone many changes. 

 Further, the young seem now to skip the immature plumage 

 in some cases and in some species. Had this stage been 

 achieved before this time, we would have had to guess at the 

 evolution of the species, even as we now must in the case of 

 the White Cockatoos. At the present time we have many 

 facts, but little connection. One thing is certain, that we 

 have here a colour-genus, though the colours are different. 



Text-figure 2. 



Side-view of beads and outline of frontal view of bills of — 

 A. Puvpureicephalus, B. Platycercus, C. Barnardius. 



The next genus, Barnardius (Text-figure 2, C), is separated 

 by the larger size of the birds and different coloration, though 

 no strikiug character can be cited, as regards structural 



