1871-] ON NEOTROPICAL LARID^E. 571 



We have before us specimens of this well-marked species from the 

 Falklands, Straits of Magellan, and coast of Southern Brazil, that 

 from the Falklands being Sclater's type. Messrs. Philippi and 

 Landbeck tell us that it ranges up the western coast of South Ame- 

 rica as far as Valdivia. P. Max. obtained it off Rio de Janeiro on 

 the eastern coast, hut did not distinguish from S. Mr undo. 



This species is easily distinguishable by its wholly coral-red bill 

 from all other Neotropical species. 



7. Sterna dougalli. 



Sterna dougalli, Mont. Orn. Diet. ; Sund. Ofv. af K. V. A. Forh. 

 1869, p. 589. 



Sterna • paradisea, Baird, B. N. A. p. 863 ; Leotaud, Ois. de Trim 

 p. 539; Coues, Ibis, 1864, p. 389; Salvin, Ibis, 1866, p. 199; 

 Gundl. Rep. F. N. i. p. 392. 



Hub. Coast of Cuba (Gundl.) ; Belize (Salvin) ; Trinidad (Leo- 

 taud) ; St. Bartholomew (Sund.). 



This is a northern, or rather "Arctopolitan," species, which de- 

 scends as far south as the West Indies and coasts of Central America. 

 Mr. Salvin found a few pairs on one of the Keys of Belize in May 

 1862, and believes they were preparing to breed there. 



8. Sterna superciliaris. 



Hati ceja blanca, Azara, Apunt. iii. p. 377. 



Sterna superciliaris, Vieill. N. D. xxxii. p. 126, et E. M. 350. 



Sterna argentea, Max. Beitr. iv. p. 871 ; Pelz. Orn. Bras. p. 325 ; 

 Burvn. Syst. Ueb. iii. p. 452, et La Plata-Reise, ii. p. 519 ; Coues, 

 Ibis, 1864, p. 390; Scl. et Salv. P. Z. S. 1866, p. 200. 



Had. Paraguay (Azara); Rio Parana (Burm.); Cuyaba (Natt.); 

 coast of Brazil (Max.) ; Ucayali (Bartl.) ; Columbia (Coues). 



We have specimens of three Neotropical species of the group of 

 little Terns (Sternula) now before us. They may be readily distin- 

 guished by the colour of their bills, which in the present bird is of 

 a uniform yellow throughout, in S. antillarum has a small black tip 

 to both mandibles, whilst in S. exilis the whole apical half is black. 

 Besides, S. exilis has a much more slender bill than the two allied 

 species, and its under plumage is grey, not white. 



Our skins of this Tern are from Southern Brazil (Rogers) and 

 Cuyaba (Natt.) ; and we have also examined Mr. Bartlett's Ucayali 

 specimens. 



9. Sterna antillarum. 



Sterna antillarum, Lesson, Descr. Maram, et Ois. p. 256 (184S) ; 

 Coues, Proc. Ac. Phil. 1862, p. 552; Ibis, 1864, p. 390; Salv. Ibis, 

 1866, p. 199 ; Gundl. Repert. F. N. i. p. 393. 



Sterna argentea, Leotaud, Ois. de Trin. p. 545. 



Sterna frenata, Gambel, Pr. Ac. Phil. 1848, p. 128. 



Hab. Coast of Cuba (Gundl.); Trinidad (Leotaud); British 

 Honduras (Salvin). 



Of this Tern Mr. Salviu's specimens have been examined by Dr. 



