Carriker : List of the Birds of Costa Rica. 451 



125 (Alajuela). — Chkrrif, Auk, VII, 1890, 333; IX, 1892, 328 (San 

 Jose — rather rare, but resident). — Underwood, Ibis, 1896, 446 (Miravalles). 



— Salvin and Godman, Biol. Gentr.-Am., Aves, III, 1901, 125 (references 

 cited). 



Polyborns audubonii Lawrence, Ann. Lye. N. Y., IX, 1868, 132 (San Jose [J. 

 Carmiol]). — Frantzius, Jour. fiirOrn., 1869, 367 (C. R.). 



C. H. Lankester Collection : Guanacaste. 



This species inhabits the Pacific slope and the peninsula of Nicoya, 

 north to Nicaragua, but does not extend south of the Gulf of Nicoya. 

 It is most abundant in Guanacaste, and even there it is few in numbers, 

 associating with the vultures. They seem very tame, for near Punta- 

 renas beside the railroad-track I noticed one which remained perching 

 while the train passed by. 



125. Ibycter americanus (Boddaert). 



(Native name " Gavelon de Cacao.") 



Falco americanus Boddaert, Tabl. Plan. Enl. , 1783, p. 25. 



Ibycter americanus Lawrence, Ann. Lye. N. Y., IX, 1868, 132 (San Jose [J. 

 Carmiol]). — Frantzius, Jour, fur Orn., 1869, 367 (Guaitil and Guanacaste). 



— Sharie, Cat. Birds Brit. Mus., I, 1874, 35. — Ridgway, Bull. U. S. 

 Geol. & Geogr. Surv. , I, 470 (San Jose [M. Calleja], Talamanca [Gabb]). — 

 Zeledon, An. Mus. Nac. de C. R., I, 1887, 125 (Jimenez, Tacares de Ala- 

 juela, Pozo Aziil de Pirris). — Cherrie, Expl. Zool. en C. R., 1890-1, 1893 

 (Terraba Valley — seen but not collected). — Sai.vin and Godman, Biol. 

 Centr.-Am., Aves, III, 1901, 128 (references cited). 



U. S. Nat. Museum : Bonilla (Ridgway) (Basulto). 



Bangs Collection : Pozo Azul de Pirris (Underwood). 



C. H. Lankester Collection : Cariblanco de Sarapiqui. 



Carnegie Museum: Pozo Azul de Pirris and El Hogar (Carriker). 



Two skins. 



An inhabitant of the forests of the lowlands of both the Pacific and 

 Caribbean. It is never abundant, is invariably seen in pairs, and is 

 very noisy. It frequently utters its peculiar cry, especially when 

 alarmed or disturbed, which resembles much the word " ca-ca-o, " so 

 much so indeed that the natives have named it " Gavelon de Cacao." 

 I have never seen the bird on the ground, but often in low trees in the 

 forest, and I imagine its food consists largely of tree-lizards and small 

 snakes. 



126. Circus hudsonius (Linnseus). 



Falco hudsonius LlNN^US, Syst. Nat., ed. 12, I, 1776, 128. 

 Circus hudsonius Vieillot, Ois. Am. Sept., I, 1807, pi. 9. — Lawrence, Ann. 



