_Rictus_ totally devoid of bristles; _bill_ as long as the head, compressed laterally; the upper mandible distinctly notched at the tip; _gonys_ ascending from the rictus and then following the line of the bill; _culmen_ ascending high in front; _nostrils_ moderately large, covered with an operculum, and placed in a groove near the base of the bill; _wings_ short, round, concave, the first three primaries graduated, the fourth, fifth, sixth and seventh equal; _tail_ lengthened, rounded, the stems rigid, the webs loose and decomposed; _tarsi_ and feet robust, the hind-toe armed with a strong nail; outer and inner toes equal in length. The only species of this genus yet discovered is as singular in its structure as it is shy and retiring in its habits; the total absence of vibrissæ in a bird apparently closely allied to _Dasyornis_, in which they are so much developed, renders it one of the anomalies of the Australian fauna. 187. Atrichia clamosa, _Gould_ Vol. II. Pl. 34. Subfamily ——? Genus SPHENŒACUS, _Strickl._ A group of reed- and grass-frequenting birds, which are found not only in every part of Australia, but also in the Indian Islands and India. 188. Sphenœacus galactotes Vol. II. Pl. 35. 189. Sphenœacus gramineus, _Gould_ Vol. II. Pl. 36. Genus ACROCEPHALUS, _Naum._ Of this European and Indian form two species inhabit Australia, where they frequent the reed-beds and the dense herbage of marshy situations. 190. Acrocephalus Australis, _Gould_ Vol. II. Pl. 37. 191. Acrocephalus longirostris, _Gould_ Vol. II. Pl. 38. Subfamily ——? Genus HYLACOLA, _Gould_. _Bill_ shorter than the head, compressed; equally broad and high at the base; _culmen_ gradually declining from the base to the tip; slightly notched at the apex; _rictus_ beset with a few fine hairs; _nostrils_ basal, oblong, rather large and defended by an operculum; _wings_ short, round and concave; first, second and third primaries graduated; the fourth, fifth and sixth equal, and the longest; _tail_ rather long and round; _tarsi_ moderate in size; _toes_ rather lengthened, the lateral toes equal. A genus comprising two species peculiar to the southern parts of the country, one of which enjoys an extensive range from South Australia to Moreton Bay; the other has, as yet, only been found in the Great Murray Scrub. 192. Hylacola pyrrhopygia Vol. II. Pl. 39. 193. Hylacola cauta, _Gould_ Vol. II. Pl. 40.