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Show 1878.] MR. H. SAUNDERS ON THE LARIN.E. 211 men of this Gull should ever have been obtained in any part of California; and Mr. Salvin inclines to think the Californian locality an erroneous one, in view of similar mistakes known to have been made with the birds collected during the voyage of the ' Venus.' It is on the other hand somewhat strange that if the head quarters of this Gull, of which the appearance is sufficiently striking to attract attention, are in the Galapagos group, none of the other visitors or naturalists should have brought any news of it. Creagrus is one of Bonaparte's arbitrary aud undefined genera ; and there seems to be no structural difference to warrant the generic separation of this species from Xema sabinii. In this paper I have from time to time acknowledged with much pleasure the assistance I have received from my friends and correspondents ; and I have now to render m y especial thanks to the authorities of the British and Cambridge Museums, and of the Smithsonian Institution, Washington, and to Dr. Brewer of Boston, to Professor Peters of Berlin, Professor Reinhardt of Copenhagen, M. Oustalet, M . Bouvier, Mr. O. Salvin, Mr. H. Seebohm, Mr. Harvie-Brown, Mr. Gervase Matthew, R.N., and Mr. E. Hargitt, for the opportunities they have severally afforded me of examining examples of rare species find also series of specimens. P.S. (April 1st).-I take this opportunity of correcting an error in my paper on the Sterninee (P.Z.S. 1876, p. 671) where two species are united under the name of Anous cceruleus. At that time I had not seen a specimen of the real A. cceruleus, Bennett; and that species and A. cinereus, Gould, are so very much alike that, until examples were available for comparison, the descriptions and plates might easily have been taken to refer to the same species in different stages of plumage. Seen by the light of further experience they appear to be distinct; and the following is their synonymy and habitat:- ANOUS CERULEUS (Bennett). Sterna cerulea, F. D. Bennett, Narr. Whaling-Voy. round Globe, ii. App. p. 248 (1840), Christmas Island, Pacific. "Sterne cendre," Neboux, Rev. Zool. Oct. 1840, p. 291, et Stolida cinerea. id. Voy. 'Venus,' Atlas, pl. 9 (1846); nee Anous cinereus, Gould, P. Z. S. 1845 (Pacific, N. of Equator). Sterna teretirostris, Lafresnaye, Rev. Zool. 1840, p. 242, et Procelsterna tereticollis, id. Mag. de Zool. 1842, pl. 29 : no locality ; both described from a single specimen purchased from a dealer at Havre. Anous parvulus, Gould, P. Z. S. 1845, p. 104 (described from a specimen obtained by Bennett at Christmas Island); Cassin, U.S. Expl. Exp., Birds, p. 393 (Honden Island, Low archip 14° S 138° W . ). Megalopterus plumbeus, Peale, U.S. Expl. Exp. p. 285 (1848) Honden Island. 14* |