THE BIRDS OF AUSTRALIA. 
or sex marked ; I am therefore unable to point out the exact characters 
by which this form is to be discriminated from the two preceding ones.” 
North discussed this species more fully than was his wont in the Austr. 
Mus. Spec. Cat., No. 1, Vol. III., p. 65 et seq., and I therefore reproduce his 
remarks : “ The typical Calyptorhynchus banksi is an inhabitant of the 
coastal brushes and contiguous mountain ranges of Southern Queensland 
and Eastern New South Wales, where the type was obtained. It is the 
largest of all the Red- tailed Black Cockatoos, although I regard Calyptorhynchus 
stellatus Wagler and C. macrorhynchus Gould only as geographical variations 
of C. banksi, and not as distinct species, all merging into one another. 
C. banksi is also an inhabitant of the western portions of Southern Queensland 
and New South Wales, its range extending into the adjoining portions of 
South Australia, but I have never heard of its occurrence in the south- 
eastern portions of the latter state. Specimens from the north-eastern 
parts of Queensland, about Cairns and the Bellenden Ker Range, are smaller 
than examples obtained in Southern Queensland and New South Wales, and 
approach the western form, C. stellatus, but from which the adult females 
may be chiefly distinguished by the larger amount of red on the tail-feathers, 
although this is by no means a constant character, as a specimen in the 
Australian Museum Collection from Western Australia has as much red on 
the tail-feathers as eastern examples. The (wing) measurement of an adult 
female from Cairns is 15.7 inches.” Then, on p. 68, “ Calyptorhynchus 
stellatus is a slightly smaller South-western and Central-Australian form of 
C. banksi ; the more rounded forms of the crest referred to by Gould are 
not apparent in the Australian Museum series of adult males from Western 
Australia. An adult male from Central Australia has the red band on the 
tail-feathers mingled with yellow, and these are crossed by several narrow, 
irregular black bands. Adult females from Western Australia may be chiefly 
distinguished by the larger amount of yellow in the tail-feathers ; again, 
this is not a constant character, for I have seen a specimen from the south- 
west with as much red on the tail-feathers as examples from the Bellenden 
Ker Range, North-eastern Queensland. Wing of adult male from Western 
Australia 16 inches ; of adult female 15.2 inches.” On p. 69 is added : 
“ Calyptorhynchus macrorhynchus is a Northern and North-west Australian 
form of C. banksi. Typically, as its name implies, it may be distinguished 
chiefly by its larger bill. . . . While typically the bills of specimens from the 
Northern Territory and North-western Australia are larger, there is proof 
that it is by no means a constant character. When one has to ask the 
locality of a specimen, before supplying a name, it is time that all these forms 
should be united under that of the first described species, Calyptorhynchus 
116 
