460 Annals of the Carnegie Museum. 



de Nicoya). — Zeledon, An. Mus. Nac. de C. R., I, 126 (Liberia, San Mateo 

 and La Palma de San Jose). — Cherrie, Expl. Zool. en C. R., 1891-2, 1893, 

 51 (Boruca and Buenos Aires) ; Auk, IX, 1892, 328 (San Jose; not common, 

 but more so at lower altitudes). — Sai.vin and Godman, Biol. Centr.-Am., 

 Aves, III, 1901, 76 (San Lucas, Irazu, Alajuela, San Isidro, Santa Ana, 

 Talamanca, Guaitil, Bebedero, Miravalles [Underwood]). — Bangs, Auk, 

 XXIV, 1907, 290 (Boruca and El Pozo [Underwood]). 



U. S. Nat. Museum: Guayabo (Ridgway and Zeledon), Pigres and 



Bonilla (Ridgway). 

 Bangs Collection : Bolson, Cerro de Santa Maria, Tenorio, El General 



de Terraba (Underwood). 

 Carnegie Museum : Pozo Azul, La Hondura, Bebedero, Miravalles ; 



El Pozo, Boruca, and Buenos Aires de Terraba (Carriker). Eleven 



skins. 



By far the commonest hawk in Costa Rica, although not abundant 

 over the whole of the country. It is rare in the Caribbean lowlands, 

 I never having seen but one bird at low altitude (Guapiles), but a 

 little higher up it is commoner. It is also sparsely scattered over the 

 lower portion of the highlands, becoming more abundant on the Paci- 

 fic slope and reaches its maximum abundance in southwestern Costa 

 Rica, in the Terraba Valley, where it is even commoner than around 

 the Gulf of Nicoya. It is usually met with along streams, although 

 not confined to such localities. It is quite fearless and feeds largely 

 on lizards. 



145. Busarellus nigricollis (Latham). 



Falco nigricollis LATHAM, Ind. Orn., I, 1 790, 30. 



Busarellus nigricollis Sharpe, Cat. Birds Brit. Mus., I, 1874, 211. — Nutting, 



Proc. U. S. Nat. Mus., V, 1882, 404 (La Palma de Nicoya). — Zeledon, An. 



Mus. Nac. de C. R., I, 1887, 126 (Las Trojas and Liberia). — Salvin and 



Godman, Biol. Centr.-Am., Aves, III, 1901, 85. 



Bangs Collection : Bolson (Underwood). 



Apparently a rare bird in Costa Rica, and thus far recorded only 

 from the shores of the Gulf of Nicoya and Guanacaste. Nutting re- 

 ports it abundant around La Palma, but it certainly is not common 

 farther north, for neither Underwood, Lankester, nor myself took it 

 in the Tempisque River region (excepting the single bird taken by 

 Underwood at Bolson). 



