1871.] 



ON NEOTROPICAL LARID.E. 



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 ac- 

 quainted with them*. 



The Neotropical Laridee may be divided into the following cate- 

 gories : — 



(1) Tropical species, either not extending beyond the limits 

 of the Neotropical region, or only into the southern part of the 

 Nearctic region — such as Phaethusa magnirostris and Rhynchops 

 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 fulginosus. 



The subjoined table shows the number of species of each genus 

 referable to these categories : — 



* 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. 



Lanes atarm = L. dominicanus. 



Larus maeidipennis. Natterer's specimens are all immature, and 



probably belong to L. cirrhoccphalus. 

 Larus atricilla = L. atricilla. 



Rhynchops nigra = R. nigra. 

 Sterna gakriculata = 8. maxima. 

 Sterna magnirostris = Pha'ethum magnirostris. 

 Sterna cayennensis = S. galericutata. 

 Sterna eantiaca = S. cantiaca. 

 Sterna argentea = S. super ciiiaris. 

 Sterna wilsoni = #. cassini. 



Sterna aranea = S. anglica. 



