The members of this genus are exclusively Australian and appear to be confined to the extra-tropical parts of the country, no species having yet been seen from the north coast. Our knowledge of this group has been extended from three to seven species, all of which are abundantly distributed over the southern portions of the continent, and two of them over Van Diemen’s Land. 398. Euphema chrysostoma Vol. V. Pl. 37. 399. Euphema elegans, _Gould_ Vol. V. Pl. 38. 400. Euphema aurantia, _Gould_ Vol. V. Pl. 39. 401. Euphema petrophila, _Gould_ Vol. V. Pl. 40. 402. Euphema pulchella Vol. V. Pl. 41. 403. Euphema splendida, _Gould_ Vol. V. Pl. 42. Captain Sturt procured a single male example of this beautiful bird during his journey into the interior of South Australia. 404. Euphema Bourkii Vol. V. Pl. 43. Captain Sturt found this species in abundance at the Depôt in Central Australia. Genus MELOPSITTACUS, _Gould_. Generic characters. _Bill_ moderate; _culmen_ arched; _tomia_ descending at the base, then ascending and curving downwards to the tip; _nostrils_ basal, lateral, open, and seated in a broad swollen cere; _wings_ rather long, pointed, first primary very long, the second the longest; _tail_ long and much graduated; _tarsi_ moderate and covered with minute scales; _toes_ slender, the outer toe much longer than the inner one. The only known species of this form is strictly gregarious, assembles in vast flocks, and is admirably adapted for plains and downs covered with grasses, upon the seeds of which it entirely subsists. 405. Melopsittacus undulatus Vol. V. Pl. 44. In all probability this bird is universally dispersed over the whole of the interior of Australia, since independently of its previously known range from Swan River on the west to New South Wales on the east, Mr. Gilbert observed it in every part of the country between Moreton Bay and the Gulf of Carpentaria. Genus NYMPHICUS, _Wagl._ As of _Melopsittacus_, there is only one species known of this genus. It is strictly Australian, and will doubtless hereafter be found to be universally distributed over that vast country; it is equally adapted for the plains, and the two birds are frequently found associated. 406. Nymphicus Novæ-Hollandiæ Vol. V. Pl. 45. There are two distinct varieties of this species, one having a much darker colouring than the other. Genus PEZOPORUS, _Ill._ Of this terrestrial form but one species is known, which is very generally distributed over the temperate portions of Australia, the islands in Bass’s Straits and Van Diemen’s Land. The eggs are laid on the bare ground.