ACANTHIZA PYRRHOPYGIA, _Gould_. Red-rumped Acanthiza. _Acanthiza pyrrhopygia_, Gould in Proc. of Zool. Soc., 1847. This species differs from the _Acanthizæ Diemenensis_, _pusilla_, _Ewingii_, and _apicalis_, in having a shorter and more robust bill, and in the greater depth of the red colouring on the rump and upper tail-coverts; it also differs from the three former in having the tail tipped with white, in which respect it assimilates to the _A. apicalis_ and _A. uropygialis_, to the former of which it is most nearly allied. I discovered this species in the Belts of the Murray, where it inhabits the small shrubby trees; upon first seeing it, I at once perceived that it was a distinct species by the red colouring of the rump, which showed very conspicuously at the distance of several yards, and also by the peculiarity of its note. In its actions it very closely assimilates to the other members of the genus, being an alert and quick little bird, carrying its tail above the level of the back, and showing the red colouring of the coverts to the greatest advantage. I succeeded in killing both sexes, and found that they exhibit no outward difference, and are only to be distinguished with certainty by dissection. All the upper surface and wings olive-brown, the feathers of the forehead margined with buff; wings brown with pale edges; throat white, each feather margined with black; abdomen whitish; flanks pale buff; upper tail-coverts rufous; tail olive, crossed by a broad band of black, and tipped on the outer webs with pale olive, on the inner webs with white; bill blackish brown, under mandible somewhat lighter; feet brown; irides reddish brown. The figures are of the natural size. [Illustration: ACANTHIZA INORNATA: _Gould_. _J. Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] ACANTHIZA INORNATA, _Gould_. Plain-coloured Acanthiza. _Acanthiza inornata_, Gould in Proc. of Zool. Soc., Part VIII. p. 171. _Djo-b̏ul-djo-b̏ul_, Aborigines of the lowland districts of Western Australia. Although neither elegant in form nor characterized by any beauty of plumage, the present little bird demands as much of our attention as any other species of the group. Its true habitat seems to be the south-western parts of Australia, for it is numerously dispersed over the colony of Swan River; it is equally abundant at King George’s Sound; and as I killed specimens on the small low islands at the mouths of Spencer’s and St. Vincent’s Gulfs, it is most probable that its range extends all along the coast between those localities. Independently of its plainer colouring, the truncated form of its tail serves at once to distinguish it from the _Acanthiza apicalis_, with which it is often seen in company; unlike the latter bird however it does not erect its tail, but carries it in a line with the body.