382 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



upper ones) white, tail band reduced to a series of large transverse 

 spots, one on each rectrix extending nearly across the feather but, in 

 fresh feathers, laterally narrowly edged with white, the spots 25-30 

 mm. wide; iris chrome yellow; cere plumbeous; feet Naples yellow; 

 claws blackish. 



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

 area on the secondaries more extensive and darker than in Leucopternis 

 albicollis costaricensis and, consequently, less noticeably if at all, barred 

 with darker black; the greater upper wing coverts deep blackish slate 

 tipped with white; some of the lesser upper wing coverts near the bend 

 of the wing sparingly marked with blackish. 



Juvenal (sexes alike). — Similar to that of Leucopternis albicollis 

 costaricensis except that the coronal and occipital streaks are paler, 

 more brownish, less blackish, and that the extensive dark area on the 

 remiges is not or only faintly barred with darker black and that the 

 innermost secondaries are pure white or nearly so, and the median 

 and lesser upper wing coverts only very sparingly marked with blackish. 



Natal down. — Not known. 



Adult male.~^Yulg 336-366 (353.5); tail 221-235 (225.3); culmen 

 from cere 24-27 (25.7); tarsus 80-85 (82.7); middle toe without claw 

 35-45 (39.2 mm.).«i 



Adult female. —Wing 362-388 (375); tail 222-234 (226.8); culmen 

 from cere 26.5-29 (27.5); tarsus 84-87 (84.6); middle toe without 

 claw 38-44 (41.6 mm.). ^^ 



Range. — Resident from southern Mexico from Veracruz (San Andres 

 Tuxtla, Mirador, Huatusco, Uvero, Playa Vicente, Atoyac) and Oaxaca 

 (Chimalapas) south to British Honduras (Cayo and Toledo district) 

 and Guatemala (Choctum, Medio Monte, Savana Grande, Agund, 

 Finca Sepacuite, Panz6s, Peten, Secanquim, Finca Sepur, Alta Vera- 

 paz, and Carolina). 



Tyjye locality. — "Hacienda Mirador, several leagues from Vera 

 Cruz," Mexico. 



(?) Falco conciliator Shaw, Gen. ZooL, vii, 1809, 77 ("Louisiana"). 



Buteo ghie^breghti Du Bus, Esq. Orn., 1845, pi. 1 ("Hacienda Mirador, several 



leagues from Vera Cruz," Mexico; orig. descr.; characters). — Strickland, 



Ornith. Syn., 1855, 36 (syn.). — Sclater, Proc. Zool. Soc. London, 1857, 



227 (San Andres Tuxtla, Veracruz) . 

 Buteo ghiesbreghtiiliATiTi.AVB, Journ. fiir Orn., 1853, 44 (Guatemala). — Sclater 



and Salvin, Ibis, 1859, 217, part (Pacific slope, Central America). — Gray 



Hand-list, i, 1869, 8, No. 71 (Mexico). — Sumichrast, Mem, Boston Soc. 



Nat. Hist., i, 1869, 560 (hot region of Veracruz). 

 Leucopternis ghieabreghti Bonaparte, Rev. Mag. Zool., vi, 1854, 533. — Sclater 



and Salvin, Exotic Orn., pt. 8, 1868, 121, part (Mexico); Nom. Av. Neotr., 



81 Six specimens from Mexico (Veracruz), Guatemala, and British Honduras. 



82 Five specimens from Guatemala and British Honduras. 



