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Show 1871.] ON NEOTROPICAL LARID.3-. 565 ourselves in the present communication with giving a revised list of the species of this family which have been ascertained to occur within the limits of the Neotropical region, so far as we are acquainted with them*. The Neotropical Laridee may be divided into the following categories :- (I) Tropical species, either not extending beyond the limits of the Neotropical region, or only into the southern part of the Nearctic region-such as Pha'ethusa magnirostris and Rhynchopts nigra. (2) Antarctic species, found only in the southern part of the continent, or not ranging further north than Southern Brazil and Peru-such as Lestris antarctica and Sterna cassinii. (3) Arctic species, which descend into the Central-American seas, or even further into the Neotropical region-such as L. franklini. (4) Tropicopolitan, or wide-ranging species in the Tropical seas -as Anous tenuirostris and Onychoprion fu/ginosus. The subjoined table shows the number of species of each genus referable to these categories :- 1. Rhynchops 2. Anous 3. Ntcnia 4. Phaethusa 5. Sterna 6. Gtelochelidon 7. Onychoprion 10. Leucophajus 11. Lestris Tropical. 1 1 1 6 "e 15 Antarctic. T 1 1 1 4 Arctic. 3 1 1 4 ... 9 Tropicopolitan. 2 "i 4 l Total. ] 2 1 1 10 1 2 1 11 1 1 32 * Since this paper was read Salvin has examined the specimens in the Imperial Cabinet at Vienna collected by Natterer in Brazil and determined by Von Pelzeln in his recently published ' Ornithologie Brasiliens.' According to our views the Laridee of v. Pelzeln's work (Orn. Bras. p. 323) should stand as follows:- Pelzeln. Scl. et Salv. Larus aearce = L. dominicanus. Larus maculipennis. Natterer's specimens are all immature, and probably belong to L. cirrhocephalus. Larus atricilla = L. atricilla. Bhynchops nigra = B. nigra. Sterna galericulata = 8. maxima. Sterna magnirostris = Phaethusa magnirostris. Sterna cayennensis = S. galericulata. Sterna cantiaca = & cantiaca. Sterna argentea = S. superciliaris. Sterna ivilsoni = S. cassini. Sterna aranea = 8. anglica. |