266 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Adult male.— Wing 368-377 (372.2); tail 207-216.5 (213.6); culmea 

 from cere 25-26.7 (25.4); tarsus 87-90.5 (88.6); middle toe without 

 claw 43.5-44.5 (44.0 mm.).=*=' 



Adult female. —Wing 397^10 (402.2); tail 222-239 (229.2); culmen 

 from cere 26-28 (26.8); tarsus 85-93.3 (87.1); middle toe without 

 claw 44-47.5 (46.2 mm.).^^ 



Type locality. — Costa Rica. 



Range. — Resident in the highlands of Central America from 

 southern Mexico (Oaxaca, Guerrero, Nayarit, Mexico), Guatemala 

 (San Lucas and Panajachel), and El Salvador (Mount Cacaguatique, 

 Los Esesmiles, Volcan de San Miguel, San Salvador, Divisadero, etc.) 

 to western Panama (Veraguas; Changuinola; Boquete, Barriles, 

 Chiriqui). The birds of southern Mexico vary in the direction of 

 calurus; birds from the Isthmus of Tehuantepec arc close to typical 

 costaricensis . 



Buteo borealis (not Falco borealis Gmelin) Sclater and Salvin, Proc. Zool. Soc. 

 London, 1864, 369 (Panama); Nom. Av. Neotr., 1873, 118, part (Panama; 

 Central America, part).— Salvin, Proc. Zool. Soc. London, 1870, 215 (Chitra, 

 Calobre, and Volcan de Cliiriquf, Panama). — Salvin and Godman, Biol. 

 Centr.-Amer. Aves, iii, 1900, 61, part (San Jose, Los Tabacales, Cartago, 

 San Isidro, Santa Maria, and La Palina de Nicoya, Costa Rica; Volcdn de 

 Chiriquf, Chitra, and Calobre, Panama; Volcan de Chinandega, Matagalpa, 

 and San Juan del Sur, Nicaragua) . 



Buteo borealis var. montanus (not Buieo montanus Nuttall) Lawrence, Ann. Lye. 

 Nat. Hist. New York, ix, 1868, 133 (San Jose and Los Tabacales, Costa 

 j^ica). — Frantzius, Journ. fur Orn., 1869, 210 (Costa Rica; crit.). 



Buteo montanus Cabanis, Journ. ftir Orn., 1869, 210 (Costa Rica; crit.). 



Buteo borealis subsp. a. Buteo montanus Sharpe, Cat. Birds Brit. Mus., i, 1874, 

 189, part (San Jose, Costa Rica; Panama). 



Buieo borealis var. costaricensis Ridgway, in Baird, Brewer, and Ridgway, Hist. 

 North Amer. Birds, iii, 1874, 258 (diagn.; Costa Rica; Veraguas, Panama; 

 excl. loc. Tres Marias); 285, footnote (Costa Rica; coll. U. S. Nat. Mus.). 



Buteo borealis costaricensis Ridgway, in Nutting, Proc. U. S. Nat. Mus., v, 1882, 

 404 (La Palma de Nicoya, Costa Rica). — Nutting, Proc. U. S. Nat. Mus., 

 vi, 1884, 377 (San Juan del Sur, Nicaragua). — Zeled6n, Proc. U. S. Nat. 

 Mus., viii, 1885, 112 (Costa Rica); Anal. Mus. Nac. Costa Rica, i, 1887, 126 

 (Cartago and Santa Maria de Dota, Costa Rica). — Carriker, Ann. Carnegie 

 Mus., vi, 1910, 457 (San Lucas de Dota, Azahar de Cartago, and Volcdn de 

 Turrialba, Costa Rica). — Swann, Synopt. List Accip., pt. 2, 1919, 48; Synop. 

 Accip., ed. 2, 1922, 78; Monogr. Birds Prey, i, 1926, 395 (monogr.).— Peters, 

 Bull. Mus. Comp. Zool., Ixxi, 1931, 310 (Changuinola, Panama). — Griscom, 

 Bull. Amer. Mus. Nat. Hist., Ixiv, 1932, 154 (distr.; Guatemala). 



Buteo borealis e. costaricensis Coues, Birds Northwest, 1874, 353 (syn.). 



Buteo costaricensis Gurney, Ibis, 1876, 239, in text (crit.); List Diurn. Birds 

 Prey, 1884, 66; Cat. Birds Prey, 1894, 24.— Sharpe, Hand-list, i, 1899, 256.— 

 Bangs, Proc. New England Zool. Club, iii, 1902, 20 (Boquete, Chiriquf, 

 Panama, 4,000 feet) . 



33 Three specimens from Veraguas, Panama, and Costa Rica. 

 31 Three specimens from Costa Rica and Guatemala. 



