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Show 578 MESSRS. SCLATER AND SALVIN [ JllllC 20, Fine adult specimens of this Gull received from the lakes of Mexico agree well with Wagler's description of his Larus pipixcan from the same locality. On the Pacific coast of Guatemala Salvin obtained one specimen in immature plumage, and saw others. The skin thus collected was identified by Dr. Coues as Larus cucullatus, who likewise records the occurrence of this species under this name as far south as Panama (Proc. Acad. Sc. Phil. 1862, p. 309). The fact of this Gull extending still further southwards, to Peru and Chili, is somewhat remarkable, but there seems to be little doubt on the subject. A specimen of Larus franklini in the British Museum is stated to have been obtained at Valparaiso by Burnett and Fitzroy; and a skin in immature plumage (exactly resembling the Guatemalan specimen) was purchased of the Maison Verreaux, marked " Chili." Besides this evidence, Messrs. Philippi and Land-beck's description of their L. cinereo-caudatus agrees accurately with L. franklini (cf. Sclater, P. Z. S. 1867, p. 336). _ In the immature birds of this species the primaries are nearly uniform dark brown, whitish on the inner web, and the tail has a broad black subterminal band. 10. LARUS GLAUCODES. Larus glaucodes, Meyen, Obs. Zool. p. 115, pl. 24 ; Burm. Syst. Ueb. iii. p. 449 ; Cassin, Gilliss's Exp. ii. p. 204 ; Ph. et Landb. Cat. Av. Chil. p. 48. Larus glaucotis, Schlegel, Mus. des P.-B. Lari, p. 42. Gavia glaucotis, Blasius, J. f. Orn. 1865, p. 374. Larus albipennis, Licht. M S . Gavia roseiventris, Gould, P. Z. S. 1859, p. 97. Larus roseiventris, Scl. P. Z. S. 1860, p. 391; Abbott, Ibis, 1861, p. 166. Hab. Coast of Chili (Meyen) ; Falkland Islands (Abbott et Pack). All the Patagonian and Chilian specimens of this Gull that we have met with belong, in our opinion, to one species, for which Meyen's name is the first. Skins from the Falkland Islands (Gavia roseiventris, Gould) are quite undistinguishable from Chilian examples, as Prof. Blasius (after examining Gould's type) has already stated*. 11. LARUS CIRRHOCEPHALUS. Gaviota cenicienta, Azara, Apunt. iii. p. 350. Larus cirrhocephalus, Vieill. N. D. xxi. p. 500, et E. M . p. 345 ; Gal. Ois. ii. t. 289 ; Scl. et Salv. P. Z. S. 1869, p. 146 ; Hudson, P. Z. S. 1870, p. 802. Larus poliocephalus, Temm. Man. d'Orn. ii. p. 780 (1820) ; Max. Beitr. iv. p. 854. Cirrhocephalus plumbeiceps, Bruch, Journ. f. O. 1855, p. 288. Larus maculipennis, Burm. Syst. Ueb. iii. p. 448, et La Plata- Reise, ii. p. 518. Hab. Pampas of La Plata (Azara, Burm.). * Journ. f. Orn. 1865, p. 374. |