188 DR. P. L. SCLATER ON A NEW COCKATOO. [May 10, 
sary to give a new name to the Cockatoo which I have heretofore 
erroneously called ducorpsii, and figured under that name in the 
‘Proceedings’ for 1862. I propose, therefore, to call it Cacatua 
ophthalmica, as its most distinguishing characteristic when living is 
the blue naked skin which surrounds the eye, and renders it at 
first sight distinguishable from every other bird of the genus. 
Before giving the specific characters of this new species, I may 
remark that the White Cockatoos, of the genus Cacatwa, may be 
divided into two very easily distinguished sections. The first em- 
braces those species which have a narrow medial head-crest, with the 
slender point recurved at the extremity, and appearing above the 
surface of the adjoining feathers when the crest is in a state of repose. 
The second contains those species which have the crest broadened 
and comprising the greater part of the head-feathers, rising when 
erect into a sphere more or less pyramidal in shape, but showing 
when in a state of repose no recurved point. The following diagnoses 
may assist in determining the species :— 
Sect. A. Crista angustata ad apicem recurva. 
1. galerita, ex Australia. 
Majores candidz, crista flava ......... 2. triton, ex Nov. Guinea et Moluce. 
Minores candide, crista aurantiaca... 3. citrinocristata, ex Timor. 
4. sulphurea, ex Timor, Flores, Lombock 
crista flava ......... et Celebes. 
5. e@quatorialis, ex Noy. Guin. et Moluce. 
Major, crista tricolore ............0e+008 6. leadbeateri, ex Australia. 
Sect. B. Crista lata incumbente. 
Candida major; crista alba ............ 7. cristata, ex Ternate. 
eristarubral ccce<s.<. 8. moluccensis, ex Ceram, Batchian et 
Ternate. 
crista limonacea ... 9. ophthalmica, ex ins. Salomon. 
minor; crista alba, intus li- 
monaceo tincta... 10. ducorpsii, ex ins. Salomon. 
genis rubro tinctis.. 11. sanguinea, ex Australia. 
crisso rubro ......... 12. philippinarum, ex ins. Philipp. 
LG Sefer Wegeemae acdicar oc coe st seoctas sae “ene 13. roseicapilla, ex Austral. 
The new species may be shortly characterized as follows :— 
CACATUA OPHTHALMICA, Sp. nov. 
Cacatua ducorpsii, Sclater, P. Z. 8.1862, p. 141, pl. xrv. 
Alba: criste plumis elongatis, intus pallide limonaceis : subala- 
ribus et caude tectricibus inferioribus limonaceo tinctis : rostro 
et pedibus nigris: annulo oculari in ave viva ceruleo: cras- 
sitie vix minore quam in Cacatua cristata. 
Hab. In ins. Salomon. 
In conclusion I may remark that the Society’s living series of 
Cockatoos contains examples of nine out of the thirteen known species, 
the deficiencies being only four, namely, C. triton, C. sulphurea, 
C. sanguinea, and C. philippinarum. 
