THE BIRDS OF AUSTRALIA. 
seemed to show considerable variation which I was unable to account 
for. I have again studied these birds and I think that the differences 
observed seem constant, notwithstanding the plumage variation which appears 
due to age. 
I have separated the two forms and anticipate that more material wiU 
emphasize the differences. It will be observed that little is known of the 
economics of either race, but that particularly we know nothing of that of the 
typical or Western form. 
The bird figured and described is a male collected on Herdsman’s Lake, 
West Australia, on the 7th of September, 1901, and is the type of westralis. 
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