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Show 506 MESSRS. SCLATER AND SALVIN [Jline 20, Subfam. I. RHYNCHOPIN.E. Genus RHYNCHOPS. 1. R H Y N C H O P S NIGRA, Linn. Rhynchops niyra, 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 Trim 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. m 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 Concepcion (Ph. et Landb.) ; also ascends the larger rivers many hundreds 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 ; aud we were at one time inclined to adopt this view, both Wallace's and Bartlett's Amazonian specimens presenting this feature, 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 plumage. 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. Coq. 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 Honduras (Salvin) ; coast of South-east Brazil (Max.) ; coast of Chili {Lesson). 2. ANOUS TENUIROSTRIS. Sterna tenuirostris, Temm. Pl. Col. 202. Anous melanoyenys, Leotaud, Ois. de Trin. p. 547(?). Anous tenuirostris, Coues, Ibis, 1864, p. 393 ; Salv. Ibis, 1866, p. 200. Hab. Coast of British Honduras (Salvin); Trinidad (Leotaud). |