The sexes are alike in colouring, but the female is much smaller than her mate; the young, as will be seen in the accompanying Plate, resembles the immature Petroicas in the character of its plumage. Head and all the upper surface brown, passing into rufous brown on the upper tail-coverts; wings dark brown, the coverts and primaries edged with dull white; primaries and secondaries crossed near the base on their inner webs with pure white; tail rich brown, all but the two middle feathers tipped with white; under surface greyish brown, passing into buff on the under tail-coverts; irides, bill and feet blackish brown. The Plate represents an adult male and a young bird of the natural size. [Illustration: EÖPSALTRIA AUSTRALIS: _Swains._ _J. Gould and H. C. Richter del et lith._ _C. Hullmandel Imp._ ] EÖPSALTRIA AUSTRALIS. Yellow-breasted Robin. _Muscicapa Australis_, Lath. Ind. Orn. Supp., p. li. _Southern Motacilla_, _Motacilla Australis_, White’s Journ., pl. in p. 239. _Southern Flycatcher_, Lath. Gen. Syn. Supp., vol. ii. p. 219.—Shaw, Gen. Zool., vol. x. p. 369.—Lath. Gen. Hist., vol. vi. p. 216. _Pachycephala Australis_, Vig. & Horsf. in Linn. Trans., vol. xv. p. 242. _Muscipeta_, sp. 15, _Muscicapa Australis_, Less. Traité d’Orn., p. 385. _Eöpsaltria flavicollis_, Swains. Class, of Birds, vol. ii. p. 250. —— _Australis_, G. R. Gray, List of Gen. of Birds, 2nd edit. p. 45. _Yellow-breasted Thrush_, Lewin, Birds of New Holl., pl. 23. _Eöpsaltria parvula_, Gould in Proc. of Zool. Soc., Part V. p. 144. female? _Yellow Robin_, Colonists of New South Wales. This is a very common species in all the brushes of New South Wales; I also observed it in most of the gardens in the neighbourhood of Sydney, as well as in those of the settlers in the interior. It is very Robin-like in its actions, particularly in the habit of raising its tail at the moment of perching, and in the sprightly air with which it moves about. It is by no means shy, and may often be seen crossing the garden walks, perching on some stump or railing, regardless of one’s presence, at which time the fine yellow mark on its rump is very conspicuous. Its powers of flight are but feeble, and are seldom employed to do more than enable it to flit from bush to bush or from tree to tree, in a peculiarly quiet Robin-like manner; never displaying the restless activity of the Pardalotes, Acanthizas, and many other tribes of birds. Its food consists entirely of insects, which are more frequently taken on the ground than on the trees.