THE BIRDS OF AUSTRALIA. 
Acanthiza pusilla. lingerandi Mathews. 
Lingerandi, Victoria. 
Acanthiza pusilla hamiltoni Mathews. 
Coonalpyn, South Australia. 
Fig. Acanthiza pusilla consobrina Mathews. 
Leigh’s Creek, Central Australia. 
Acanthiza pusilla whitlocki North. 
Lake Way, West Australia. 
Fig. Acanthiza pusilla tanami Mathews. 
Tanami, Central North Territory. 
Acanthiza pusilla nullarborensis White. 
East of West Australia. 
while 
Acanthiza pusilla arno Mathews. 
Eyre’s Peninsula, South Australia. 
Acanthiza pusilla. i venus Mathews. 
Venus Bay, South Australia. 
Acanthiza pusilla northi Mathews. 
Wilson’s Inlet, West Australia. 
Fig. Acanthiza pusilla apicalis Gould. 
Perth, West Australia. 
Fig. Acanthiza pusilla peroni Mathews. 
Peron Peninsula, West Australia. 
Acanthiza pusilla dundasi Mathews. 
Lake Dundas, West Australia, 
are nearer the former but vary towards the latter 
and 
Fig. Acanthiza pusilla bunya Mathews. 
South Queensland. 
Acanthiza pusilla Jcatherina De Vis. 
North Queensland. 
are another variation from the first-named. 
From the above it is suggested that we see here the process of the formation 
of species and that in more generations we should have three or four distinct 
representative species each with their own range and defined characters, whereas 
now the definition is indistinct, as an immature of the “ apicalis ” group is very 
like a mature of the “ pusilla ” group in the peculiar characters of the group 
showing the evolution of the form. 
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