We are here again presented with another form, the structure, habits, and manners of which are all equally singular. The only species yet discovered inhabits New South Wales, where it frequents stony gullies and rocky situations in the neighbourhood of caverns, to the roofs of which it attaches its pendent nest, as shown in the Plate. 222. Origma rubricata Vol. II. Pl. 69. Genus CALAMANTHUS, _Gould_. Generic characters. _Bill_ shorter than the head, dilated at the base, compressed laterally towards the tip; _culmen_ sharp and advancing upon the forehead; _nostrils_ lateral, large, oval, and covered by an operculum; rictus destitute of bristles; _wings_ short, round, the fourth quill the longest, the third, fifth, sixth and seventh equal; _tail_ rather short and round; _tarsi_ moderately long, defended anteriorly with indistinct scales; hind-toe rather long, with a long claw; lateral toes uneven, the outer one the shortest. This group comprises two species, one inhabiting Van Diemen’s Land, the other Southern and Western Australia; they are terrestrial in their habits, but occasionally perch on the smaller branches of the trees. 223. Calamanthus fuliginosus Vol. II. Pl. 70. 224. Calamanthus campestris, _Gould_ Vol. II. Pl. 71. Genus CHTHONICOLA, _Gould_. Generic characters. _Bill_ short, gradually descending from the base; the upper mandible slightly notched at the tip, compressed laterally; _tomia_ curving inwards; _wings_ concave; the first primary very short, the third, fourth, fifth and sixth nearly equal and the longest; _tail_ slightly concave, and all the feathers of an equal length; _tarsi_ moderately long; _toes_ short, the hinder toe somewhat longer than the middle one; front claws more curved than in the genus _Anthus_. The single species known of this genus combines in a remarkable manner the outward appearance, habits and manners of the _Acanthizæ_ and _Anthi_, but is, I believe, more nearly allied to the former than to the latter. 225. Chthonicola minima Vol. II. Pl. 72. _Sylvia sagittata_, Lath. Gen. Hist. vol. vii. p. 136? Rather widely dispersed over the grassy flats of New South Wales, and constructs a domed nest in a depression of the ground like the true _Sylviæ_. Subfamily MOTACILLINÆ, _Bonap._ Genus ANTHUS, _Bechst._ Whether this Old World form is represented in Australia by more than a single species, is a point I have not satisfactorily determined; every part of its extra-tropical regions, including Van Diemen’s Land, is inhabited by Pipits which differ somewhat in size in almost every colony; still their difference is so slight that I have hitherto regarded them as mere varieties or local races. 226. Anthus Australis, _Vig. & Horsf._ Vol. II. Pl. 73. Subfamily ——?