380 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



36 mm., in width; iris rich dark brown with bluish-black pupil; cere 

 horn blue; maxilla dark bluish black; mandible slate horn blue; inside 

 of mouth bluish; feet banana 3^ellow; claws bluish black. 



Immature (sexes alike). — Similar to the adult but with lesser upper 

 wing coverts somewhat more abundantly marked with blackish; 

 the innermost secondaries, which are almost wholly white in very old 

 birds, barred with blackish irregularly both in amount and in pattern; 

 the outer webs of all the secondaries often with a little white in the 

 barring; tail band averaging slightly broader (32-39 mm.). 



Juvenal (sexes alike). — Similar to adult but with the top of the 

 head with fine brownish or brownish black shaft streaks which become 

 darker and broader on the occiput, and, to a lesser extent, on the 

 auriculars also ; some of the scapulars with fine blackish shaft streaks ; 

 the lesser and median upper wing coverts much streaked or barred 

 with blackish or even solid black basally, especially those near the 

 bend of the wing; those farthest from the bend, that is, the inner 

 secondary coverts usually pure white or at most with ver}^ fine black- 

 ish shaft streaks ; the inner secondaries strongly barred with blackish ; 

 the outer webs of the secondaries with some whitish on the paler 

 bars; tail band broader (40-52 mm.). 



Natal down.- — Not known. 



Adult male.— Wing 325-368 (350.5); tail 221-244 (227.2); cuhnen 

 from cere 26-29 (27); tarsus 84-94 (89.7); middle toe without claw 

 36-44 (40.5 mm.). ^^ 



Adult female.— Wing 340-378 (361.7); tail 225-246 (232.4); culmen 

 from cere 26-30 (27.9); tarsus 81-94 (87.7); middle toe without claw 

 38-44 (40.6 mm.) .^° 



Range. — Resident from Honduras (Lancetilla and Segovia River); 

 south through Nicaragua (Chontalas, Rio Escondido, Matagalpa, 

 Rio Grande, San Emilio, and Lake Nicaragua): and Costa Rica; were 

 found chiefly in the more humid portion of the eastern (Caribbean) 

 lowlands in forested country, spreading northwestward to the northern 

 part of Guanacaste, v/here less numerous (Jimenez, Caruillo, Naranjo, 

 Reventazon, Bonilla, La Vijagua, Tenorio, Gudcimo, Gudpiles, El 

 Hogar, Miravalles; doubtfully recorded from Cerro de la Candelaria); 

 to eastern Panamd (Cordillera de Tole; Calovevora; Chitra; Bogaba, 

 Veraguas; Lion Hill; Almu-ante; Boquete Trail; Obaldia; Perme 

 Cafia, Darien; Barro Colorado, C. Z.). 



Type locality. — Carillo, Costa Rica. 



Buteo ghiesbreghtii Lawrence, Ann. Lye. Nat. Hist. New York, vii, 1861, 289 

 (Panama). — Salvin, Proc. Zool. Soc. London, 1867, 158 (Cordillera de 

 Tole, Panama). 



" Twenty-nine specimens from Panama, Costa Rica, Nicaragua, and Honduras. 

 8° Fourteen specimens from Panama, Costa Rica, Nicaragua, and Honduras. 



