Although the _Monarcha trivirgata_ has been known to naturalists for many years it is still a scarce bird, very few specimens occurring in any of the numerous collections sent home from Australia, which is doubtless occasioned by its true habitat not having been yet discovered. All the specimens I have seen have been procured in the Moreton Bay district of the east coast. I have never yet seen what may be considered the female of this bird; all the examples that have come under my notice being males and marked precisely alike, with the exception of one procured during the early part of Dr. Leichardt’s expedition from Moreton Bay to Port Essington, which differs in being destitute of the rufous tint on the flanks. Forehead, throat, space round the eye, and the ears jet-black; upper surface dark grey; tail black, the three outer feathers on each side largely tipped with white; cheeks, chest and flanks rufous; abdomen and tail-coverts white; bill lead-colour; feet black. The figures are of the natural size, and represent the bird as usually seen, and also the variation in colouring above-mentioned. [Illustration: GERYGONE ALBOGULARIS: _Gould_. _J. Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] GERYGONE ALBOGULARIS, _Gould_. White-throated Gerygone. _Psilopus albogularis_, Gould in Proc. of Zool. Soc., Part V. p. 147; and in Syn. Birds of Australia, Part IV. This sprightly and active little bird is a stationary species and is abundantly dispersed over all parts of New South Wales, but evinces a greater preference for the open forests of _Eucalypti_ than for the brushes near the coast. I found it in considerable numbers in every part of the Upper Hunter district, nearly always among the gum-trees, and constantly uttering a peculiar and not very harmonious strain. Like its near allies it is very active among the small leafy branches of the trees, where it searches with the greatest avidity for insects, upon which it almost exclusively subsists; resorting for this purpose to trees of all heights, from the low sapling of two yards high to those of the loftiest growth. I believe that a species very nearly allied to the present inhabits the north coast of Australia: it is very readily distinguished by the markings of the tail; and must not be confounded with the bird here represented. I have killed young birds in January which had not long left the nest, but was not so fortunate as to discover the nest itself. The sexes are nearly alike in plumage; but the young of the year are distinguished from the adult by the throat being of the same colour as the breast, instead of white.