THE BIRDS OF AUSTRALIA. 
also show individual variation. The nestling is greyer and the streaking on the 
fore-head and cheeks as also on the breast is less marked. 
The interior bird which will be called : 
Acanthiza pusilla whitlocki North 
The type from Lake Way, Mid- West Australia is a very pallid form, the upper 
coloration being pale grey, no brown shade at all, the rump very pale huffish, 
the tail with distinct white tips, and the abdomen and flanks almost pure 
white. 
H. L. White has just recently written : “ I have classed this Acanthiza 
in the pusilla series, and it most resembles apicalis, of which whitlocki appears 
a lighter phase. The bird of the Nullarbor is still lighter coloured, having the 
upper-surface greyish-olive except the coverts, which are wood- brown, while 
the scales on the forehead are nearly white, thus differing in this respect from 
all other Acanthizee in the “ H. L. White Collection.” With the approval of 
ornithologists I think this little Nullarbor bud might be known in the vernacular 
as the “ White-scaled Tit ” or 
Acanthiza pusilla nullarbor ensis. 
There are four skins from Zanthus and Naretha.” 
I have named the Peron Peninsula form : 
Acanthiza pusilla peroni 
and it is much paler than typical Acanthiza pusilla apicalis but is not so pale as 
the preceding form. Specimens from Geraldton may for the present be classed 
with the Perth birds, but may easily represent another subspecies as there are so 
many variations, which seem geographically fixed, round the coast. The interior 
birds are not so easily separable but I admit 
Acanthiza pusilla tanami 
from Tanami, West Northern Territory, a puzzling form which I at first regarded 
as a distinct species, the characters have been given. 
The Central Australian birds as collected by Captain S. A. White may 
represent more than one subspecies but I here only recognise one : 
Acanthiza pusilla consobrina 
as ranging through the interior from Leigh’s Creek to the McDonnell Ranges 
and I am inclined to class with them the Gawler Range birds for the present, 
but later when more material is collected these may be separable. All are darker 
than the preceding Acanthiza pusilla whitlocki but are similarly grey above, and 
referable to the pyrrhopygia series. Of this Acanthiza pusilla jayi Mathews 
may be a synonym. 
An overlooked subspecies which must be named is : 
Acanthiza pusilla cobborensis subsp. nov. 
from Cobbora, New South Wales. 
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