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Show 1871.] ON NEOTROPICAL LARID/E. 577 Chroicocephalus atricilla, Baird, B. N. A. 850 ; Coues, Ibis, 1864, p. 388; Gundl. Rep. F. N . i. p. 391; Newton, Ibis, 1859, p. 371. Xema atricilla, Cab. in Schomb. Guian. iii. p. 761. Hab. West Indies, Jamaica (Gosse), St. Croix (Newton), St. Bartholomew (Sund.) ; Cuba (Gundl.); Atlantic and Pacific coasts of Guatemala (Salvin); Guiana (Schomb.) ; Lower Amazon, near Para (Natterer). 8. LARUS SERRANUS. Larus serranus, Tsch. Wiegm. Arch. 1844, p. 314; Faun. Per. Aves, p. 307; Burm. Syst. Ueb. iii. p. 449, et La Plata-Reise, ii. p. 519; Scl. et Salv. P. Z. S. 1869, p. 158. Larus bonapartii, Scl. et Salv. P. Z. S. 1868, p. 178. Chroicocephalus personatus, Bruch, Journ. f. Orn. 1855, p. 289. Larus personatus, Schlegel, Mus. des P.-B. Lari, p. 35. Gavia personata, Blasius, J. f. Orn. 1865, p. 372. Hab. Sierra and Puna regions of Peru (Tsch.) ; Islay and Tinta (Whitely); Bolivia (D'Orb.) ; rep. Argentina, Mendoza (Burm.). The first skin of this Gull received from Mr. Whitely was in immature plumage, and was wrongly identified by us with L. bonapartii. It is, however, unquestionably identical with skins of birds in full plumage of the present species subsequently received from the same collector. In its adult dress L. serranus is an unmistakable species, from its large size and deep-black head. 9. LARUS FRANKLINI. Larus franklinii, Swains. F. B. A. ii. p. 424, pl. 71 (1831); Sund. Ofv. af K. V. A. F. 1869, p. 590. Chroicocephalus franklinii, Bruch, J. f. O. 1853, p. 289; Baird, B. N. A. p. 851. Larus pipixcan, Wagl. Isis, 1831, p. 515*. Chroicocephalus kittlizii, Bruch, J. f. O. 1853, p. 104(?). Larus cinereo-caudatus, Ph. et Landb. Wiegm. Arch. 1861, p. 293. Larus cucullatus, Licht. Nomencl. p. 98 (descr. nulla). Chroicocephalus cucullatus, Bruch, Journ. f. O. 1853, p. 290; Baird, B. N . A. 851; Coues, Ibis, 1864, p. 388; Salvin, Ibis, 1866, p. 198. Hab. Lakes of Mexico (Keerl et Boucard) ; Pacific coast of Guatemala (Salvin) ; St. Bartholomew (Sund.) ; Panama (Suckley) ; coast of Chili, north of Concepcion (Ph. et Landb.). After what Blasius has said in his critical remarks upon the Laridee (Journ. f. Orn. 1865, p. 371), there can be little doubt that L. cucullatus is identical with L. franklini. W e have ourselves gone carefully into this question, and can arrive at no other conclusion, although the American ornithologists appear to be of a different opinion. * In the Munich Museum there are six specimens of this Gull, which are probably Wagler's types, as they are named Larus pipixcan, and are labelled as coming from Mexico. All these specimens are immature, but are of different ages. They belong, no doubt, to L. franklini.-O. S. PROC. ZOOL. Soc-1871, No. XXXVII. |
