The circumstance of this species never having been characterized until I described it in the “Proceedings of the Zoological Society,” above quoted, may doubtless be attributed to its being solely an inhabitant of the north and north-west coasts of Australia, portions of the country where few collections have been formed. With the exception of a specimen brought home by Captain Chambers, R.N., and another in the collection of Mr. Bankier, my own specimens are all that I have ever seen; the whole of these were collected at Port Essington. The Blood-stained Cockatoo inhabits swamps and wet grassy meadows, and is often to be seen in company with its near ally the _Cacatua galerita_, but I am informed it is even more shy and difficult of approach than that bird. It is doubtless attracted to the swampy districts by the various species of Orchidaceous plants that grow in such localities, upon the roots of which at some seasons it mainly subsists. But little difference occurs either in the size or the colouring of the sexes, and I have young birds, which, although a third less in size, closely assimilate in every respect to the adult, so much so that an examination of the bill, which during immaturity is soft and yielding to the touch, is necessary to distinguish them. I have never yet observed this species in collections from New Guinea; but I think it more than likely that its range may extend to that island, the fauna of which is at present so imperfectly known to us. All the plumage white; base of the feathers of the lores and sides of the face stained with patches of blood-red; base of the inner webs of the primaries, secondaries and tail-feathers fine sulphur-yellow; bill yellowish white; feet mealy brown. The figures are those of a male and a female about the natural size. [Illustration: CACATUA EOS. _J. Gould and H.C. Richter del et lith._ _Hullmandel & Walton Imp._ ] CACATUA EOS. Rose-breasted Cockatoo. _Psittacus Eos_, Kuhl, Nova Acta, tom. x. p. 88.—Temm. Pl. Col., 81. _Cacatua rosea_, Vieill. Gal. des Ois., tom. ii. p. 5. pl. 25.—Ib. Ency. Méth. Orn., Part iii. p. 1414.—Less. Traité d’Orn., p. 183. _Plyctolophus Eos_, Vig. and Horsf. in Linn. Trans., vol. xv. p. 269. _Rose-coloured Cockatoo_, Lath. Gen. Hist., vol. ii. p. 207. _Cacatua roseicapilla_, Wagl. Mon. Psitt, in Abhand., pp. 504, 691. —— _Eos_, Less. Man. d’Orn., tom. ii. p. 143. _The Rose Cockatoo_, Sturt’s Travels in Australia, vol. ii. pl. in p. 79.