16 BIRDS OF AUSTRALIA. 



usually seen in small troops of from four to six in number. 

 It has many characters in common with the Black Cockatoos 

 of the south coast, but no species of the genus yet discovered 

 has the bill so largely developed, which development is doubt- 

 less requisite to enable it to procure some pecuhar kind of 

 food at present unknown to us ; it assimilates to the C. 

 banksii of New South Wales in the lengthened form of its 

 crest, but differs in having much shorter wings, and in the 

 mandibles being fully one-third larger. The females of the 

 two species also vary considerably in the colouring of the 

 bands across the tail-feathers, which in the C. bauhii is pure 

 scarlet, while the same part of the female of the present bird 

 is mingled yellow and scarlet. It differs from the C. naso of 

 Western Australia in having a larger bill than that species, 

 and in the much greater length of the crest. 



The male has the whole of the plumage glossy bluish black ; 

 lateral tail-feathers, except the external web of the outer one, 

 crossed by a broad band of fine scarlet ; bill horn-colour ; 

 irides blackish brown ; feet mealy blackish brown. 



The female has the general plumage as in the male, but 

 with the crest-feathers, those on the sides of the face and 

 neck, and the wing-coverts spotted with light yellow ; each 

 feather of the under surface, but particularly the chest, crossed 

 by several semicircular fasciae of yellowish buff; lateral tail- 

 feathers crossed on the under surface by numerous irregular 

 bands of dull yellow, which are broad and freckled with black 

 at the base of the tail, and become narrower and more irre- 

 gular as they approach the tip ; on the upper surface of the 

 tail these bands are bright yellow at the base of the feathers, 

 and gradually change into pale scarlet as they approach the 

 tip ; irides blackish brown. 



Total length 22 inches ; bill — length 1^, depth 3 ; wing 16 ; 

 tail 21 ; tarsi 1. 



