_Acanthiza Ewingii_, Gould in Proc. of Zool. Soc., August 13, 1844. This species of _Acanthiza_ is a native of Van Diemen’s Land, and has been named after the Reverend Thomas James Ewing, a gentleman ardently attached to the study of Natural History, and a sincere friend to all who have the advantage of his acquaintance. That there were two nearly allied species of this genus inhabiting Van Diemen’s Land was an opinion I had entertained before my visit to that country, and I have since ascertained that this opinion was a correct one, although I did not reside there long enough to ascertain what difference may exist in the habits and economy of the two birds. The _Acanthiza Ewingii_ is more elegant in all its proportions than its near ally, the _Acanthiza Diemenensis_, for although it is a smaller bird, its tarsi are longer and more slender. There is also a rich brown mark at the base of the primaries of _A. Ewingii_, which does not occur in any other known species; the markings of the breast also are more indistinct and clouded with blue-grey, while in _A. Diemenensis_ this part of the plumage is lighter and more inclined to brown. I have never seen this little bird on the continent of Australia, and I believe that it never occurs there. Crown of the head light brown; all the upper surface brownish olive; wings dark brown; primaries margined at the base with sandy buff; tail rich brown, crossed by a broad band of black near the tip; the lateral feathers tipped with white; throat speckled black and white; under surface pale olive; irides dark brown; bill and feet brown. The Plate represents the two sexes of the natural size. [Illustration: ACANTHIZA UROPYGIALIS: _Gould_. _J. Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] ACANTHIZA UROPYGIALIS, _Gould_. Chestnut-rumped Acanthiza. _Acanthiza uropygialis_, Gould in Proc. of Zool. Soc., Part V. p. 146; and in Syn. Birds of Australia, Part IV. I received this new and well-marked species from New South Wales, with the belief that it had been collected either on the Liverpool Plains or the country immediately to the northward of them; but as there is some degree of uncertainty as to the locality in which it was procured, a knowledge of its true habitat would be very desirable, and I should have been happy to have cleared up this point had it been in my power so to do. The chestnut colour pervading the basal half of the tail and the tail-coverts forms a very conspicuous mark, and presents a strong contrast to the remainder of the plumage. That its habits, actions and economy are very similar to those of the other members of the genus there can be no doubt, but on these points also I am compelled to silence, no notes of any kind having been sent with the specimens.