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Show 1871.] ON NEOTROPICAL LARID.E. 579 Not having been able to examine authentic specimens of this species (from La Plata and South Brazil), we reserve our remarks on it for a future occasion. If, as Bruch says, the cap of the adult bird is grey like the back (J. f. Orn. 1855, p. 288), there can be no doubt of its distinctness from the brown-headed L. glaucodes. Blasius and Schlegel both consider this bird identical with L. phceocephalus, Sw., of the coast of Africa. As regards Larus maculipennis of Lichtenstein, Blasius is of opinion that it is a distinct species, allied to L. glaucodes*. But L. maculipennis of Burmeister certainly belongs to the present bird. Genus 2. LEUCOPH/EUS, Bp. 1. LEUCOPHCEUS SCORESBII. Larus scoresbii, Trail, Mem. Wern. Soc. iv. p. 514 (1823) ; Pelz. Orn. Novara Exp. p. 151; Abbott, Ibis, 1861, p. 165; Sclater, P. Z. S. 1860, p. 391. Larus hcematorhynchus, King, Zool. Journ. iv. p. 103 (1828); Jard. et Selb. 111. Orn. t. 106; Darwin, Zool. Beagle, iii. p. 142; Ph. et Landb. Cat. Av. Chil. p. 48. Leucophceus hcematorhynchus, Bruch, J. f. Orn. 1853, p. 108, et 1855, p. 287. Leucophceus scoresbii, Blasius, J. f. Orn. 1865, p. 378. Hab. Patagonia, Port St. Julian (Darwin); Falkland Islands (Abbott) ; Chiloe (Ph. et Landb.). This Gull is easily recognizable in every state of plumage by the peculiar form of the bill, which fully entitles it to generic rank. The young bird has a brown cap, just as in Larus belcheri, which disappears in the adult. Fig. 5. Head of Leucophceus scoresbii (reduced one-third"). Subfam. IV. LESTRIDIN^E. Genus LESTRIS, 111. 1. LESTRIS ANTARCTICUS. Lestris antarcticus, Less. Trait. d'Orn. p. 606 (1831); Abbott, * Journ. f. Orn. 1865, p. 374. |