THE BIRDS OF AUSTRALIA. 
When I drew up my “ Reference List ” in 1912 I arranged : 
Ptilotis unicolor unicolor Gould. 
Northern Territory. 
Ptilotis unicolor yarra Mathews. 
“ Differs from P. u. unicolor in its much greener coloration above. 
Inkerman, Queensland.” 
Queensland. 
Ptilotis unicolor darbiski Mathews. 
“ Differs from P. u. unicolor in its paler coloration above and below, 
especially noticeable on the abdomen. Fitzroy River, North-west Australia. 
North-west Australia. 
I later added 
Ptilotis unicolor brenda. 
“ Differs from P. u. unicolor in its lighter coloration and larger size. Melville 
Island.” 
Melville Island, Northern Territory. 
I accepted these four in my 1913 "List,” referring them to the genus 
Stomiopera proposed sixty years previously. 
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