LIST OF WESTERN AUSTRALIAN BIRDS COLLECTED BY MR. CAIRN, AND MR. W. H. BOYER-BOWER, AT DERBY AND ITS VICINITY, WITH REMARKS ON THE SPECIES. By Dr. E. P. Ramsay, F.R.S.E. Part I. Mr. Cairn's Collection. The Australian Museum has recently become enriched by a fine collection of Birds from Western Australia, obtained at Derby and its vicinity by Mr. Cairn, who, it will be remembed, made some important zoological collections during 1882-3 in New Guinea. The following is a list of the species which have already come to hand, for, unfortunately, two boxes containing a large portion of the collection are still missing. 1. Astur approximans, Vig. & Horsf. Although Gould has given the name of Astur cruentus to the western species I have not yet seen any specimens that can be distinguished from the birds known to us from Eastern Australia. Salvadori (Orn. Pap. et Molucc. I. p. 60), places Gould's A. cruentus with Cuvier's Falco (Urospizias) torquatus, and my Astur sharpei and others ; but in this I cannot concur. Gould's A. cruentus, may be the same as the Timor bird, but it is certainly not identical with A. sliarpei. The figures of A. approximans, given by Gould, (fol. Yol. I. pi. 17), have been taken from immature birds ; when fullv adult the bars in the under surface of the body are of a rich vinous red. Younger specimens closely resemble Accipiter torquatus in plumage (p. 1096).