YELLOW-CHEEKED PARROT. 
black, the tail-feathers are deep blue, but the rump is still greenish. It may 
be that a series from the Margaret River or the Coast would never show this 
red phase, but remain always green as the birds seem to do at Wilson’s Inlet. 
Platycercus icterotis xcmthogenys Salvadori. Interior. 
The interior birds apparently from the nest assume a grey coloration 
on the back, the feathers having black bases, the rump grey and the middle 
tail-feathers blue. The grey tips of the back soon become red, such red feathers 
certainly showing in the first or second year. The gradation between this 
and the green phase is seen in the series available, but it is also probable that 
more than one subspecies will hereafter be recognised. Thus, the Southern 
Cross series are purely grey, while the Lake Dundas lot show greenish rumps, 
though the back feathers are black with red and grey tips intermixed. These 
were regarded by Whitlock as immature birds of the first year. 
The evolution of this interior grey phase from a purely green coastal phase 
is quite novel in the genus ; on the East side of Australia under similar circum- 
stances a yellow phase has evolved, and it seems that the green immature is 
more persistent on the West coastal regions than it is in the East coastal. It 
is somewhat obvious that the species arrived in West Australia via the South 
Coast in the universal green plumage, apparently even before the blue cheeks 
were evolved. If this be admitted, it has developed the red coloration more 
slowly than its Eastern analogue, and the xanthochroistic tendency seen in 
the yellow cheeks has been otherwise entirely suppressed. 
