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Show 322 MR. R. B. SHARPE ON THE BIRDS OF LABUAN. [Apr. 1, Order ACCIPITRES. Suborder F A L C O N E S . Family FALCONID^E. Subfamily ACCIPITRIN^;. 1. CIRCUS SPILONOTUS, Kaup. Circus spilonotus, Sharpe, Cat. B. i. p. 58; id. Ibis, 1877, p. A new species for Labuan, where Mr. Ussher obtained an immature male in September 1876 and a fine adult male in January 1877. This Harrier was first introduced to the notice of naturalists as a Bornean bird by Mr. Alfred Everett (cf. Sharpe, Ibis, 1876, p. 30). Governor Ussher has also sent it from Brunei, as will be seen by the list of birds published by me in the ' Ibis' for the present year. Mr. Treacher sent a pair of young birds from Labuan, but without indication of the native name beyond the word " Alang," which means " Hawk." Subfamily BUTEONIN^E. 2. BUTASTUR INDICUS (Gm.). Butastur indicus, Sharpe, Cat. B. i. p. 297 (1874). Poliornis indica, Salvad. t. c. p. 9. Included in his work by Count Salvadori, with a query, no specimen having been sent from Borneo up to the time he wrote. Governor Ussher was therefore the first discoverer of the species in the Bornean avifauna. Five specimens were shot by him in different plumage in September and October 1876. Mr. Treacher also sends five specimens, and gives the native name as "Alang alap alap." Four of them are fine adult birds ; and one is young ; the latter, in addition to the mottled plumage and streaked breast, has five dark brown bands on the tail, much narrower than in the adult. One of Mr. Treacher's skins (the young bird) had the same native name "Alang juali" as the Peregrine Falcon, showing apparently that the natives have a different name for the young bird, or else that the collector mistook it for the young of the Peregrine. Subfamily AQUILIN^E. 3 SPIZAETUS LIMNAETUS (Horsf.). Spizaetus limnaetus, Sharpe, t. c. p. 272 ; Salvad. t. c. p. " Not uncommon, but extremely shy and difficult of approach ; it is a great foe to poultry, and also feeds on shell-fish " (H. T. U.). Mr. Low sends a nestling, nearly full-grown, which is black all over, like the adult, of which three specimens are in Mr. Ussher's collection. This seems to show that I am wrong in considering the the S. caligatus of Raffles to be the young of S. limnaetus, as I put forward in my ' Catalogue of Birds ' (/. c.) ; but in Mr. Treacher's collection was a young bird in the striped plumage (similar to S. cirratus), with five bands on the middle and seven on the outer feathers. Although I at present keep only one species of Spizaetus |