_Psittacus Novæ-Hollandiæ_, Lath., Ind. Orn., vol. i. p. 102.—Gmel. Linn., vol. i. p. 323. _Crested Parrakeet_, Lath. Gen. Syn., vol. i. p. 250.—Ib. Gen. Hist., vol. ii. p. 174, No. 88.—Shaw, Zool., vol. viii. p. 452. _Palæornis Novæ-Hollandiæ_, Lear, Ill. Psitt. Pl. 27. _Nymphicus Novæ-Hollandiæ_, Wagl., Mon. Psitt. in Abhand, &c., pp. 490 and 522.—Selb., Nat. Lib., vol. vi. Parrots, p. 186, Pl. 30.—G. R. Gray, List of Gen. of Birds, 2nd Edit., p. 66. _Leptolophus auricomis_, Swains. Zool. Ill. 2nd Ser. Pl. 112.—Ib. Class. of Birds, vol. ii. p. 305. _Calopsitta Guy_, Less., Ill. Zool. vol. iii. 2nd sp., Pl 112., female. The interior portion of the vast continent of Australia may be said to possess a Fauna almost peculiar to itself, but of which our present knowledge is extremely limited. New forms therefore of great interest may be expected when the difficulties which the explorer has to encounter in his journey towards the centre shall be overcome. The beautiful and elegant bird forming the subject of the present Plate is one of its denizens; I have it is true seen it cross the great mountain ranges and breed on the flats between them and the sea; still this is an unusual occurrence, and the few there found compared to the thousands observed on the plains stretching from the interior side of the mountains, proves that they have as it were overstepped their natural boundary. Its range is extended over the whole of the southern portion of Australia, and being strictly a migratory bird, it makes a simultaneous movement southward to within one hundred miles of the coast in September, arriving in the York district near Swan River in Western Australia precisely at the same time that it appears on the Liverpool Plains in the eastern portion of the country. After breeding and rearing a numerous progeny, the whole again retire northwards in February and March, but to what degree of latitude towards the tropics they wend their way I have not been able satisfactorily to ascertain. I have never received it from Port Essington, or any other part in the same latitude, which, however, is no proof that it does not visit that part of the continent, since it is merely the country near the coast that has yet been traversed; in all probability it will be found at a little distance in the interior, wherever there are situations suitable to its habits, but doubtless at opposite periods to those in which it occurs in New South Wales. It would appear to be more numerous in the eastern division of Australia than in the western. During the summer of 1839 it was breeding in all the apple-tree (_Angophora_) flats on the Upper Hunter, as well as on all similar districts on the Peel, and other rivers which flow northwards. After the breeding-season is over it congregates in immense flocks before taking its departure. I have seen the ground quite covered by them while engaged in procuring food, and it was not an