Genus ANTHOCHÆRA, _Vig. & Horsf._ A genus peculiarly Australian, three species of which are exclusively confined to the southern or extra-tropical parts of the country, and one to Van Diemen’s Land. 305. Anthochæra inauris, _Gould_ Vol. IV. Pl. 54. 306. Anthochæra carunculata Vol. IV. Pl. 55. 307. Anthochæra mellivora Vol. IV. Pl. 56. 308. Anthochæra lunulata, _Gould_ Vol. IV. Pl. 57. These four birds might with propriety be separated into two genera, those with auricular appendages, _A. inauris_ and _A. carunculata_, having many characters differing from those of _A. mellivora_ and _A. lunulata_. Genus TROPIDORHYNCHUS, _Vig. & Horsf._ The law of representation in Australia is chiefly confined to the species inhabiting the eastern and western coasts, but with the members of this genus it takes the opposite direction, or north and south, for more singular and perfect representatives of each other cannot be found than are the _T. corniculatus_ and _T. citreogularis_ of the south-eastern parts of the country, the _T. argenticeps_ and _T. sordidus_ of the north-western. Extra Australian species inhabit New Guinea and the neighbouring countries. 309. Tropidorhynchus corniculatus Vol. IV. Pl. 58. 310. Tropidorhynchus argenticeps, _Gould_ Vol. IV. Pl. 59. 311. Tropidorhynchus citreogularis, _Gould_ Vol. IV. Pl. 60. 312. Tropidorhynchus sordidus. Inhabits the Cobourg Peninsula, and is precisely similar to _T. citreogularis_, but is smaller in all its admeasurements except in the bill, which is more developed. Genus ACANTHORHYNCHUS, _Gould_. _Bill_ elongated, slender and acute, compressed on the sides; _tomia_ incurved; _culmen_ acute and elevated; _nostrils_ basal, elongated, and covered with an operculum; _wings_ moderate in size and semi-rotund; first and fifth primaries equal; the third and fourth nearly equal in length, and the longest; _tail_ moderate in size and slightly forked; _tarsi_ lengthened and strong; middle toe long and robust, external toe exceeding the inner one in length. This genus, like many others of the family, may be regarded as strictly Australian: it comprises two, if not three, well-marked species, each of which is confined to a particular part of the country; the _A. tenuirostris_ dwelling in the eastern, and the _A. superciliosus_ in the western districts: both inhabit countries precisely in the same degree of latitude, and form beautiful representatives of each other. Van Diemen’s Land is the native habitat of the species I have named _A. dubius_, which, as will be seen, I had made synonymous with _A. tenuirostris_, but which I am now inclined to consider distinct, an opinion in which Mr. Blyth coincides.