Many species of this genus occur in India, the Indian Islands, New Guinea, and Polynesia; and five or six are comprised in the fauna of Australia, over every part of which country, including Van Diemen’s Land, one or other member of the group is found to exist. 129. Rhipidura albiscapa, _Gould_ Vol. II. Pl. 83. 130. Rhipidura rufifrons Vol. II. Pl. 84. 131. Rhipidura Dryas, _Gould_. Inhabits the north coast. I have not figured this species because it only differs from _R. rufifrons_ in being of a smaller size, and in the red colouring at the base of the tail-feathers being more extensive. 132. Rhipidura isura, _Gould_ Vol. II. Pl. 85. 133. Rhipidura Motacilloïdes, _Vig. & Horsf._ Vol. II. Pl. 86. 134. Rhipidura picata, _Gould_. Not figured, being similar in colour but much smaller than _R. Motacilloïdes_; it inhabits Port Essington. Genus SEÏSURA, _Vig. & Horsf._ The present genus and _Rhipidura_ are mere modifications of each other; a difference of structure, however, exists of sufficient importance to justify their separation, and, as is always the case, a corresponding difference is found in the habits of the species. The present form is restricted to Australia. 135. Seïsura inquieta Vol. II. Pl. 87. _Turdus muscicola_, Lath. Gen. Hist. vol. v. p. 123. —— _dubius_, Lath. Genus PIEZORHYNCHUS, _Gould_. Generic characters. _Bill_ longer than the head; deeper than broad, almost cylindrical; compressed on the sides, notched at the tip; _nostrils_ basal, small and round; _wings_ short; first primary moderate, the fourth the longest; _tail_ rather short and round; _tarsi_ moderately long and somewhat feeble; the inner and middle toes connected as far as the first joint, the outer one the longest. The only species of this genus yet discovered is a native of the northern parts of Australia, from Cape York to Port Essington, where it frequents the dense beds of Mangroves. 136. Piezorhynchus nitidus, _Gould_ Vol. II. Pl. 88. Genus MYIÄGRA, _Vig. & Horsf._ A group of insectivorous birds, the greater number of which inhabit the Indian Islands and Polynesia, and of which four species are found in Australia. 137. Myiägra plumbea, _Vig. & Horsf._ Vol. II. Pl. 89. 138. Myiägra concinna, _Gould_ Vol. II. Pl. 90. 139. Myiägra nitida, _Gould_ Vol. II. Pl. 91. 140. Myiägra latirostris, _Gould_ Vol. II. Pl. 92. Genus MICRŒCA, _Gould_. Generic characters.