PURPLE -CROWNED LORIKEET. 
Chandler, in the next volume, p. 36, 1913, confirmed this note adding : 
“ It was noticed that from nearly every nest which contained eggs, if 
the tree were tapped in the late morning or early afternoon, two birds were 
flushed.” 
In 1912 I selected New South Wales as the type locality of this species, 
a locality where it does not occur. As a matter of fact, the species seems to 
be extending its range into eastern Victoria and may even occur in south- 
west New South Wales, but it is a South and West Australian bird, 
strictly limited to the south. Whether it originated in West Australia and 
travelled eastwards, an unlikely proposition, or travelled from the east to 
the west is not easy of decision. At the present time it is equally common 
in South and West Australia, and is certainly travelling eastward from the 
former into Victoria. 
The eastern and western forms are easily separable by the obviously 
paler coloration of the latter, and two subspecies must be recognised. 
Glossopsitta porphyrocephala porphyrocephala (Dietrichsen), South 
Australia ; Victoria. 
Glossopsitta porphyrocephala whitlocki Mathews, South-west Australia. 
The last named seem to be slightly smaller, with shorter tails and shorter 
tarsus and toes. This suggests nothing. I make this remark, as I have just 
seen two papers dealing with geographical distribution ; one writer argues 
that the centre of distribution of a species is where it is strongest, while the 
other maintains that the original habitat of a species would show its weakest 
form. Neither is generally right, as the environmental factors work in 
different ways in each case, and what might be true in one case would be 
wrong in another. I will deal later with some aspects in this connection. 
VOL. VI 
57 
