THE BIRDS OF AUSTRALIA. 
ten specimens from the Aroe Islands measuring : wing 310-357 mm., 
culmen 69-95 mm. ; ??, wing 318-346 mm., culmen 73-92 mm. The Leyden 
Museum possess seven specimens from Waigeoe, one from Gemein, three from 
Salawatti and three from Misool. These are, as a rule, larger than those 
from the Aroe Islands, measuring : wing 342-382 mm., culmen 94-112 
mm. ; $$, wing 335—370 mm., culmen 74—87 mm. Specimens from Misool 
seem to be smaller than those from the other three islands. The largest 
specimens in the collection are those from the north-western peninsula of 
New Guinea (3 from Dorei, 1 from Andai, 1 from Doktur, and 1 from Sorong) 
and from Skroe, west coast of New Guinea (3 specimens), measuring : 
“wing 386-400 mm., culmen 97-103 mm. ; $$, wing, 380-400 mm., culmen 
79-108 mm. Much smaller are the specimens (15) from the Noord River, 
South New Guinea, measuring : <?<?, wing 373-374 mm., culmen 101-111 mm. ; 
9?» wing 334-365 mm., culmen 72-84 mm. Individuals from all the named 
localities differ only in size, not in plumage. I have not seen examples from 
Australia, but according to Schlegel and to Finsch these are smaller than 
those from North-west New Guinea, Waigeoe, and Salawatti. They likely 
agree with examples from South New Guinea. The material at my disposal 
is too insufficient as to say how many forms, except that of the Aroe 
Islands, are to be recognised. When the examples from Australia and from 
South New Guinea are constantly smaller, then the large examples from 
North-west New Guinea also must be separated sub specifically. 
“ There are, however, in the Leyden Museum two adult black cockatoos 
from the north coast of New Guinea, a male from the Humboldt Bay, 
23 March, 1903, and a female from Lake Sentani 28 June, 1903, collected 
by Messrs, de Beaufort and Lorentz during the Wichmann Expedition. 
These birds are quite differing from the other specimens in our collection by 
the shape of the crest-feathers. These feathers are much narrower, about 
the half, and more pointed than those of the specimens from the other 
localities, except a specimen from the island of Jobi in the Geelvink Bay, 
in which the crest-feathers are also narrower, but less than in the two above- 
named birds. The difference is so conspicuous that I separate the birds from 
the Humboldt Bay under the name of Microglo-ssus aterrimus stenolophus 
nov. subsp. They measure: <$, wing 393 mm., culmen 114 mm.: $, wing 
359 mm., culmen 87 mm. The specimen from Jobi has the crest-feathers 
a little broader, but still much narrower than those of the specimens from 
Dorei and other localities ; it is intermediate between those from the 
Humboldt Bay and from West New Guinea, and probably belongs to 
another subspecies. This specimen, a male, measures : wing, 362, culmen 
96 mm,” 
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