BROWN HAWK. 
together. The majority I have seen are dark birds, but light specimens have 
been examined from Perth, Whlson’s Islet, Broome Hill and Parry’s Creek, 
and conversely dark birds from Lake Way. 
In the preceding I give seven names, and the only alternative to their 
usage is the binomial. As the latter hides all the peculiarities known of the 
variation of this interesting bird, it seems certain that the comparative 
multiplicity of trinomials is a benefit. That there is more to be learnt from 
the usage of these is the note that the King Island bird was recorded 
as H. herigora by A. G. Campbell, while Mellor and White wrote : “A 
specimen procured by Dr. J. Burton Cleland was certainly more like 
H. occidentalis than H. herigora {—orientalis). The bird was very light and 
striped on the breast.” 
All birds known from Coastal Victoria and Tasmania are of the 
orientalis type, so that it is remarkable that the birds of the islands between 
should be of the herigora (true) type. 
I have treated the birds as referable to one species only ; I have studied 
them also as referable to two, but the distribution is even more complex 
than as above : thus the two earliest names are /. herigora and I. orientalis, 
as /. occidentalis is undoubtedly equivalent to the former. 
We would then have 
I. orientalis. 
Coastal Eastern Australia (Queensland, New South Wales, Victoria). 
Tasmania, South-west Australia, Mid- west Australia, North-west Australia, 
Coastal Northern Territory. Apparently not South Australia. 
I. herigora. 
Inland New South Wales, possibly North-west Victoria, all South 
Australia, Central Australia, West Australia even on the coast. Interior 
Northern Territory and South Queensland, King Island and Flinders Island, 
Bass Straits. 
I. orientalis x I. herigora. 
Melville Island. 
A majority of the birds from many localities would look like my third 
group, and I do not recommend this disposition. I am quite certain 
that neither proposals will satisfy everybody, but at least I have shown 
that I have attempted to deal with this problem which has puzzled 
every ornithologist who has studied Australian birds, and I do not claim 
to have solved the problem. I only hope I have prepared a workable 
basis for future research. 
The species occurs also in New Guinea, and in conclusion I would quote 
from the pens of the recognised authorities on New Guinea, also written as 
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