KAKATOE. 
value. Nevertheless, the genus has been commonly accepted ever since its 
introduction by Wagler in 1832. 
However, leaving out the coloured species, which is quite obviously not 
congeneric, there appears to be two kinds of crest formation among the 
White Cockatoos. The evolution of an ornament of this kind, which is 
quite independent of food-habits, would appear to have more phylogenetic 
value and has been so considered by some systematic workers. We would 
thus arrive at four groups in one step instead of only two used by Salvador!. 
With this conclusion in view the birds were examined in order to group them 
for my “ List of the Birds of Australia.” The result was as follows : 
Cacatoes 
Lophochroa 
Ducorpsius 
Eolophus 
Licmetis 
Cacatoes galerita. 
Lophochroa leadbeateri. 
Ducorpsius sanguineus and gymnopis . 
Eolophus roseicapillus. 
Licmetis tenuirostris. 
It has been suggested that such mono ty pic genera are not desirable, 
but how else these birds can be accurately arranged is a matter not easily 
decided. As already stated, if colour only were used, all the white ones 
would go together and the coloured one separated. I had selected as type 
of Cacatoes the species galerita , and this species has the bill of the nature of 
the species commonly accepted as generically distinct under the name Licmetis . 
It varies as a subspecific character, so that a form sixty years ago was dis- 
tinguished under the name licmetorhyncha. The species varies somewhat 
in size, but is the largest of the White Cockatoos, and has a long erectile crest 
of narrow feathers. I have already detailed the generic characters, so here 
note the differences other species show. 
An absolutely similarly coloured series of birds are of smaller size, a 
somewhat similarly foimed bill, a notable bare eye space, though lores ^re 
feathered and the cere is also covered by feathers, the nostrils quite hiddten. 
A peculiar crest has been, however, developed by these birds, short, rounded, 
broad feathers, somewhat resembling the crest of the Umbrella bird. If 
Licmetis be recognised, this group certainly must be, and hence I used the 
name provided by Bonaparte, Ducorpsius. 
Another species has a pink flush through its plumage, thus separating 
it rather widely from the previous three groups, Cacatoes , Licmetis , and 
Ducorpsius. It possesses a crest recalling very closely that of the first- 
named, but the feathers are broader. It might have been classed with that, 
the difference in coloration being ignored, were it not for the fact that it had 
evolved a distinct wing formula. As the wing formula of the above three 
165 
