566 MESSRS. SCLATER AND SAEV1N [JlUie20, 



Subfam. I. Rhynchopin.e. 

 Genus Rhynchops. 

 I. Rhynchops nigra, Linn. 



Rhynchops nigra, Linn. S. N. i. p. 228 ; Licht. Doubl. p. 80 ; 

 Baird, B. N. A. p. 866 ; Max. Beitr. iv. p. 877 ; Burm. Syst. Ueb. 

 iii. p. 454, et La Plata, ii. p. 320 ; Leotaud, Ois. de Trin. p. 534 ; 

 Pelz. Orn. Bras. p. 324 ; Ph. et Land. Cat. Av. Chil. p. 50 ; Gundl. 

 Rep. F. N. i. p. 393 ; Salvin, Ibis, 1865, p. 193, et 1866, p. 200. 



Rhynchops melanura et R. borealis, Swains. An. in Men. p. 340 ; 

 Scl. et Salv. P. Z. S. 1866, p. 201, 1867, pp. 593, 754; Cab. in 

 Schomb. Guian. iii. p. 761. 



Rhynchops cinerascens et R. brevirostris, Spix (av. jr.). 



Rayador, Azara, Apunt. iii. p. 329. 



Hab. Coasts of America, from Cuba (Gundlach) down to 45° S. 1. 

 (Darwin); on the western coast of South America down to Con- 

 cepcion (Ph. et Landb.) ; also ascends the larger rivers many hun- 

 dreds of miles, Ucayali (Bartlett) ; Rio Napo (P. Z. S. 1858, p. 77 ) ; 

 Matogrosso and Cajutuba (Natt.). 



The southern bird is separated by Swainson as having the tail 

 black ; and we were at one time inclined to adopt this view, both 

 Wallace's and Bartlett' s Amazonian specimens presenting this fea- 

 ture, whereas Salviu's series from Central America have the lateral 

 tail-feathers pure white, and a well-defined white collar behind. But 

 one of Salvin's skins shows the lateral rectrices dark in the middle ; 

 and as his specimens were all shot in midwinter, it is possible that 

 the tail of the northern bird may grow blacker in the summer plu- 

 mage. At the same time, it is probable that northern and southern 

 birds may be generally distinguished by the greater amount of white 

 on the wings and tail of the former. 



Subfam. II. Sternin^e. 

 Genus 1. Anous, Leach. 



1. Anous stolidus. 



Sterna stolida, Linn. S. N. i. p. 227 ; Less. Zool. Cotj. i. p. 244 ; 

 Max. Beitr. iv. p. 874 ; Burm. Syst. Ueb. iii. p. 453. 



Anous stolidus, Baird, B. N. A. p. 865 ; Coues, Ibis, 1864, p. 392 ; 

 Gundl. Rep. F. N. i. p. 393 ; Sund. Ofv. af K. V. A. F. 1869, p. 590. 



Hab. Cuba (Gundlach) ; St. Bartholomew (Sund.) ; British Hon- 

 duras (Salvin) ; coast of South-east Brazil (Max.) ; coast of Chili 

 (Lesson). 



2. Anous tenuirostris. 



Sterna tenuirostris, Temm. PI. Col. 202. 

 Anous melanogenys, Leotaud, Ois. de Trin. p. 547(?). 

 Anous tenuirostris, Coues, Ibis, 1864, p. 393 ; Salv. Ibis, 18(i(i, 

 p. 200. 



Hub. Coast of British Honduras (Salvin); Trinidad (Leotaud). 



