BIRDS OF NORTH AND MIDDLE AMERICA 595 



(Altagracia, Caicara, Quiribana de Caircara, and Ciudad Bolivar, Venezuela; 

 fresh colors of unfeathered parts).— Thayer and Bangs, Bull. Mus. Comp. 

 Zool., xlvi, 1905, 144 (San Miguel and Saboga Islands, Bay of Panama). — 

 Brabourne and Chubb, Birds South Amer., 1, 1912, 63, part (Colombia; 

 Venezuela; Brit. Guiana).— Cherrie, Bull. Brooklyn Inst. Sci., ii, 1916, 341 

 (Orinoco Valley, Venezuela; habits; food; colors of soft parts). — Chubb, 

 Birds Brit. Guiana, i, 1916, 217 (habits).— Chapman, Bull. Amer. Mus. 

 Nat. Hist., xxxvi, 1917, 239 (San Antonio, Cali, La Manuelita, La Palma, 

 Chicoral, Honda, Calamar, and Barrigon, Colombia; crit.).— Stone, Proc. 

 Acad. Nat. Sci. Philadelphia, 1918, 248 (Panama Canal Zone).— Swann, 

 Synopt. List Accip., pt. 1, 1919, 9 part (Guiana).— Delacour, Ibis, 1923, 145 

 (Gudrico and Apure, Venezuela; food).— Young, Ibis, 1925, 467 (Berbice, 

 Brit. Guiana; nest and eggs); 1929, 6 (coast of British Guiana; habits; nest 

 and eggs) . 



Mllvago chimachima chimachima Swann, Synop. Accip., pt. 1, 1921, 15, part 

 (Panama to Guiana). 



Milvago chimachima cordata Bangs and Penard, Bull. Mus. Comp. Zool., Ixii, 

 1918, 35 (San Miguel Island, Bay of Panama; coll. Mus. Comp. Zool.).— 

 Swann, Synopt. List Accip., pt. 3, 1920, 115; Synop. Accip., pt. 1, 1921, 15 

 (Panama); Monogr. Birds of Prey, i, 1925, 89 (monogr.).— Todd and Carri- 

 KER, Ann. Carnegie Mus., xiv, 1922, 163 (Bonda, Santa Marta, Colombia).— 

 Sturgis, Field Book Birds Panama Canal Zone, 1928, 127 (descr.; habits; 

 Panama Canal Zone).— Darlington, Bull. Mus. Comp. Zool., Ixxi, 1931, 

 369 (Rio Frio, Magdalena, Colombia). 



Milvago chimachima cordatus Bangs, Bull. Mus. Comp. Zool., Ixx, 1930, 185 

 (type spec, in Mus. Comp. Zool.).— Peters, Check-list Birds of World, i, 

 1931, 279.— Griscom, Auk, 1, 1933, 303 (Panama: Rio Chepo, Dari6n; spec); 

 Bull. Mus. Comp. Zool., Ixxviii, 1935, 302 (arid tropical areas on Pacific 

 slope of Panama).— Aldrich, Sci. Publ. Cleveland Mus. Nat. Hist., vii, 

 1937, 51 (spec; Paracote, Azuero Peninsula, Panama). — Wetmore, Proc. 

 U. s'. Nat. Mus., Ixxxvii, 1939, 187 (Venezuela; seen near Ocumare de la 

 Costa and El Sombrero); Smiths. Misc. Coll., cvi. No. 1, 1946, 29 (Pearl 

 Islands, Panama). — Dugand, Rev. Acad. Colomb., iii, 1940, 221 (Mag- 

 dalena-Caribbean area, Colombia; very common).— Murphy, Auk, Ixii, 

 1945, 116 (Pearl Islands, Panama). 



Ibycler chimachima Sharpe, Cat. Birds Brit. Mus. i, 1874, 39, part (Bay of Pan- 

 ama), 455, part (Demerara, Brit. Guiana). — Reichenow, Die Vogel, i, 1913, 



373. 

 Milvago chijnango (lapsus) Sclater and Salvin, Proc. Zool. Soc. London, 1869, 

 252 (Lake of Valencia, Venezuela). 



Genus POLYBORUS Vieillotis 



Polyborus Viellot, Analyse, 1816, 22. (Type, by monotypy, "Caracara Buff."= 



Falco tharus Molina.) 

 Poliborus (emendation) Vieillot, Nouv. Diet. Hist. Nat., v, 1816, 256 



15 Hellmayr and Conover (Cat. Birds Amer., pt. 1, No. 4, 1949, 281) have given 

 reasons for considering Caracara Merrem as the proper generic name for this group 

 in place of Polyborus. While it is undeniable that the "Caracara" of BufFon is 

 Circus buffoni, and that it is the only included species listed by Vieillot for his 

 genus Polyborus, the described generic characters were taken from Falco plancus. 

 Because of this ambiguity I retain the name Polyborus until the A. 0. U. Committee 

 on Classification and Nomenclature has acted on it. 

 839094—50 39 



