WHITE-TAILED BLACK COCKATOO. 
the material available. Further collections may prove the existence of the 
narrow-billed inland form, and that my coastal specimens are simply erratic 
occurrences due to the movements of the species. This has continually been 
proved in connection with Palsearctic birds, and when we have studied 
Australian birds better we may clear up some of these points. With regard 
to the species, North wrote : “It has no ally.” It is, however, simply a 
bird like funereus, with the pale yellow of the ear-coverts and tail changed 
to white. 
In many similar cases only subspecific value has been allotted such a 
distinction, and it may be that such will later be only given here. In the 
meanwhile, the fact that no intermediates whatever are known allows of full 
specific value being accepted, but it is very possible that such may hereafter 
be recognised. 
vol. vi. 137 
lit xlil" iVi'VMi T * EB| B 1 I I '* * ' * 
