LONGBILLED COCKATOO. 
I have conjectured that this might be the case, but upon re-examination 
of records and specimens I find no proof, but rather the reverse. I have 
noted that Ramsay recorded a large specimen of Cacatua sanguined from 
Derby. This is the type locality of my Licmetis tenuirostris derbyi. Upon 
criticising Ramsay’s measurements, however, I find his specimen might 
belong to my form, and this suggests the acceptance of only one species. 
I here give the ranges of the forms. 
“ Ducorpsius ” sanguineus sanguineus (Gould). Northern Territory. 
“ Ducorpsius ” sanguineus distinctus Mathews. Northern Territory 
(West) Inland. 
“ Ducorpsius ” sanguineus subdistinctus Mathews. North-west 
Australia (Parry’s Creek). 
Licmetis tenuirostris derbyi Mathews. North-west Australia (Derby). 
“ Ducorpsius ” sanguineus westralensis Mathews. Mid-west Australia. 
Licmetis tenuirostris pastinator Gould. South-west Australia. 
Licmetis tenuirostris tenuirostris (Kuhl). South Australia, Victoria, 
New South Wales. 
Ducorpsius sanguineus ashbyi Mathews. Inland New South Wales, 
Northern (Inland) South Australia, Inland South Queensland. 
Ducorpsius sanguineus normantoni Mathews Normanton, Queensland. 
The points to note in this are as follows : 
D. s. distinctus is unlike D. s. sanguineus and is very near to L. t. pastinator. 
L. t. derbyi is so like D. s . sanguineus that apparently it was recorded 
under the latter name by Ramsay. 
If the two species were found inhabiting the same district their validity 
would be proven, and then we have D. s. westralensis, the next form to L. t. 
pastinator , but these are very distinct. This is the best argument for the 
retention of the two species, but the validity of the two genera is still left 
doubtful. 
An interesting item I had nearly overlooked must be here commented upon. 
Writing about the Birds of the Brunette Downs, Northern Territory, in the 
Emu, Vol. XIII., p. 206, 1914, Barnard has recorded : “ Licmetis tenuirostris. 
Long-billed Cockatoo (Corella). Seen in flocks of hundreds. A few were found 
breeding during February and March in hollows in the coolibah trees.” 
These are probably the birds I call D. s. distinctus , but it is pleasing to 
have confirmatory independent evidence of their nearness to Licmetis. This 
record makes it certain that more field work must be done and that this matter 
is not yet settled. 
I give the few field notes relative to the Western form hereafter, and point 
to the confusion between the forms in West Australia as worthy of investigation. 
219 
