643 
the Birds of North Queensland. 
roosting in the trees close together; in the morning they 
separate and go out in small flocks to their feeding-grounds 
and return to their roosting-place after sunset. They nip off 
all the leaves and smaller twigs from the trees on which they 
roost. Iris brown; feet and bill black; bare skin on the 
face bluish white ” (Olive). 
At least five forms of the larger Sulphur-crested Cockatoo 
have been described at different times, viz. :— 
C. galerita. Australia. 
C. licmetorhyncha. Tasmania. 
C. triton. Central Dutch New Guinea. 
C. macrolopha. Western Papuan Islands and Aru Islands. 
C. trobriandi. Louisiades and D’Entrecasteaux group. 
If all these forms, which are mainly founded on differences 
in dimensions, and only two of which, C. galerita and C. tri¬ 
ton, are generally recognized, are to be maintained, it becomes 
a question to which of them our specimens with the wing 
311-330 mm. are to be referred. The colour of the skin 
round the eye, noted by Mr. Olive as bluish white , seems to 
indicate an approach to the race occurring at Port Moresby , 
C. triton auct., to which species a female collected by 
Dr. Coppinger at Hammond Island, Torres Straits, has been 
referred by Salvadori (loc. cit.). In addition, the yellow 
tinge on the ear-coverts is less marked than in specimens 
from more southern parts of Australia. 
There is no doubt that if all the forms cited were inhabi¬ 
tants of one continental area, it would be considered by many 
unnecessary to distinguish specifically even such markedly 
different forms as C. trobriandi and C. galerita. 
If we compare specimens from Northern New Guinea 
with others from Tasmania or New South Wales, the differ¬ 
ence in dimensions is sufficiently striking, whilst the bare 
parts are also differently coloured. According to Salvadori, 
however (Orn. Pap. i. p. 95), specimens fully equal in size to 
the larger examples from Australia do occur in New Guinea, 
while, on the other hand, specimens from Northern Australia 
are undoubtedly smaller than many of those from New 
Guinea. 
