6l6 PATAGONIAN EXPEDITIONS! ZOOLOGY. 



showed that though its crop was crowded to its utmost capacity, it con- 

 tained nothing but young grasshoppers, not a trace of other food being 

 found in its stomach." 



Genus TACHYTRIORCHIS Kaup. 



Type. 



Tachytriorchis, Kaup, Classif. Saug. u. Vog. p. 123 

 (1848); Sharpe, Cat. Bds. Brit. Mus. i. p. 161 

 ( 1 874) ; Sharpe, Hand-list Bds. i. p. 254 ( 1 899) . T. albicaudatus. 

 Geographical Range. Eastern and central Brazil from the Tropic of 

 Capricorn northwards to Guiana and Colombia, along the western coast 

 of Central America into the southwestern boundary of the United States. 



TACHYTRIORCHIS ALBICAUDATUS (Vieillot). 



Aquila coliblanca, Azara, Apunt. I. p. 69 (1802). 



Buteo albicaudatus, Vieill. N. Diet. d'Hist. IV. p. 477 (1816); Pucher. 

 Rev. et Mag. Zool. 1857, P- 87; Gurney, Ibis, 1875, p. 67; id. List 

 Diurn. B. Prey, p. 69 (1884); Scl. & Huds. Argent. Orn. II. p. 61 

 (1889); Albert, Contr. Estud. Av. Chil. II. p. 519 (1901). 



Spizaetus leucurus, Vieill. N. Diet. d'Hist. Nat. xxxii. p. 59 ( 1819 : ex Azara). 



Falco pterocles, Temm. PI. Col. I. pis. 56, 139 (1823). 



Buteo pterocles, Less. Man. d'Orn. I. p. 103 (1828); Scl. & Salv. Nomencl. 

 Av. Neotr. p. 119 (1873); Durnf. Ibis, 1876, p. 161 (Buenos Aires); 

 Doering, Expl. al Rio Negro, Zool. p. 51 (1882: abundant in the 

 valley of the Rio Negro about Choelechoel); White, P. Z. S. 1882, 

 p. 622 (Monte Grande, April); Barrows, Auk, I. p. 109 (1884: Arroyo 

 Gualeguaychu, April). 



Buteo albicauda, Less. Traite d'Orn. p. 81, pi. 15, fig. 2 (1831). 



Tachytriorchis pterocles, Kaup. Classif. Saug. u. Vog. p. 123 (1844); id. 

 Contr. Orn. 1850, p. 75. 



Buteo tricolor, Hartl. (nee. d'Orn.) Ind. Azara, p. i (1847). 



Buteo leucuru.s, Lafr. Rev. Zool. 1849, P- IO - 



Tachytriorchis albicaudatus, Sharpe, Cat. B. Brit. Mus. I. p. 162 (1874); id. 

 Hand-list B. I. p. 254 (1899). 



Buteo melanostethos, Phil. VOg. Chil. Arch. Naturg. 1899, p. 107 (Chili). 



Buteo pcecilogaster, Phil. torn. cit. p. 167. 



Buteo (Asturina?} cethiops, Phil. torn. cit. p. 168. 



Buteo pteroclis, Carbajal, La Patagonia, Part II. p. 256 (1900). 



