BROWN HAWK. 
Firstly, no Striped birds were noted from Tasmania : this was 
independently noted, and North has also recorded it, while Littler also 
accepts this fact. 
Secondly, Victorian birds were all seen to belong to the Brown bird, and 
recourse to literature confirmed this, only a few stray references being made 
to the Striped form, proving, if at all, it occurred only as a straggler. 
Thirdly, South Australian birds from most places, as admitted by 
Gould, belong to the Striped bird. West Australian birds are not peculiarly 
Striped ones, but both Brown and Striped ones are commonly reported 
together. 
Fourthly. All Interior birds so far are Striped birds, and from the 
Northern Territory, Queensland and New South Wales, wherever access to 
the interior occurs. Striped birds are recognised. But, just as commonly 
in the three last-named places, coastal birds are recorded as Brown Hawks. 
Fifthly. All Cape York birds are Brown Birds and 
Finally. The species occurs in New Guinea and is separated as a 
subspecies, which I will later discuss, but which is a Brown Hawk. 
Whether there are one or two species I cannot decide even as North 
concluded, but in view of the above I am only recognising one. The above 
results, however, need names for their expression, so that I subdivide the 
species into subspecies in order to emphasize the facts. 
I am suggesting that the Striped form is the oldest and that the Brown 
Hawk is the later evolution. I have not absolute facts to prove this, but 
can quote the tendency of Australia to produce melanistic forms evidenced 
by the Wedge-tailed Eagle, the Black Falcon, and the Little Eagle. In the 
latter we have a case of the immature plumage apparently being retained at 
times. 
The Striped Hawk is the Interior bird occurring in the Northern 
Territory, North Queensland, New South Wales, Victoria (?), South Australia 
and West Australia only where there is open access to the Interior. ' 
The Brown Hawk occurs alone at Cape York, Tasmania and probably 
Victoria : on the coastal districts of Queensland, New South Wales and the 
Northern Territory. 
As access to the coast is practically unrestricted all along the West Coast, 
we have a Striped Brown Hawk series ; that is, a dark Brown Hawk 
showing stripes. The only method whereby we can show these facts is 
by using trinomial names for the predominant forms, and we forcibly 
see here the usage of subtrinomials, proposed by Meyer and Wiglesworth, 
indicated. Thus, however we diagnose any race, the characters given 
will not exclude individuals from other localities. We can therefore only 
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