58 FALCONIDA. 
Section B. Majores. Ala remigibus externis tribus in pogonio interno eXCrsis 5 
cauda brevis; ale longissime. 
2. Buteo albicaudatus. 
Aguila coliblanca, Azara, Apunt. i. p. 69°. 
Buteo albicaudatus, Vieill. N. Dict. d’Hist. N. iv. p. 477°; Salv. Pp. Z.S. 1870, p. 215° ; Ferrari- 
Perez, Pr. U. S. Nat. Mus. ix. p. 167‘; Bendire, Life Hist. N. Amer. Birds, p. 234, t. 7. 
figs. 8, 9°; Fisher, Bull. U.S. Dep. Agr. no. 3, p. 72°, 
Tachytriorchis albicaudatus, Sharpe, Cat. Birds Brit. Mus. i. p. 1627; Sumichrast, La Nat. v. 
p- 236 °. 
Buteo albicaudatus sennetti, Allen, Bull. Am. Mus. N. H. v. p. 144 *, 
Tachytriorchis sennetti, Sharpe, Hand-list Birds, i. p. 255". 
Falco pterocles, Temm. Pl. Col. tt. 56, 139". 
Buteo pterocles, Lawr. Bull. U.S. Nat. Mus. no. 4, p. 41 ™. 
Tachytriorchis pterocles, Cab. J. f. Orn. 1869, p. 210 an 
Buteo erythronotus, Scl. P. Z. S. 1857, p. 211 * (nec King) ; 1859, pp. 368°, 889°" ; Scl. & Salv. 
Ibis, 1860, p. 401°’; Lawr. Ann. Lyc. N. Y. ix. pp. 133 8 207"; v. Frantz. J. f. Orn. 
1869, p. 368 *°. 
Buteo albonotatus, Scl. & Salv. Ibis, 1859, p. 217” (nec Kaup). 
Supra plumbeus, capite summo et cervicis lateribus erisescentioribus ; loris albis ; dorso postico et tectricibus 
supracaudalibus pure albis; humeris ferruginosis et scapularibus ferrugineo intermixtis: subtus pure 
albus, gula vix plumbeo striata; hypochondriis fasciis paucis tenuibus notatis; alis apicibus plumbeo- 
nigris, medialiter pallidioribus, leviter griseo fasciatis; subalaribus albis; axillaribus albis, plumbeo 
transfasciatis ; cauda alba, supra griseo tincta et fasciis angustis griseis transnotata, fascia lata subapicali 
nigra; cera et pedibus flavis. Long. tota circa 19-0, ale 16°6, caudee 7-0, tarsi 3°5. (Descr. exempl. ex 
San Gerénimo, Guatemala. Mus. nostr.) 
Forma altera, vix junior, gula tota plumbea. 
Juv. Supra nigricanti-fuscus, humeris vix ferrugineo marginatis; dorso postico albo, plumis omnibus fascia 
lata subterminali fusca notatis; cauda supra grisea haud fasciata, ad apicem obscuriore: subtus nigri- 
canti-fuscus, plumis omnibus ad basin albis et fulvo marginatis ; tibiis et tectricibus subcaudalibus cervinis 
fusco maculatis. 
Hab. Norra America, Lower Rio Grande Valley, Texas > ° °.—Mexico, Zacatecas (W. B. 
Richardson), Jalapa (de Oca, Ferrari-Perez*), Mirador (Sumichrast®), Orizaba 
(Botteri 4), Talea (Boucard '°), Puebla, Oaxaca, Tehuantepec, Tapana, Tonala, 
Cacoprieto (Sumichrast * °), Merida in Yucatan (Schott); Guatemata, Antigua 
(Constancia 7), Duefias (0. S. & F. D. G.), El Baoul (0. S.), San Gerdénimo 
(R. Owen); Costa Rica (v. Frantzius °°), San José (Carmiol 15), San Antonio 
(Zeledon 18); Panama, Calovevora, Chitra (Arcé?)—Sourn America generally on 
the eastern side of the Andes from Colombia and Guiana to Argentina. 
This Buzzard is easily recognized by its white under surface and long wings, the 
latter extending beyond the tip of the tail, the three outer primaries only are excised *. 
The rectrices are crossed by numerous bands of dusky brown, thirteen in number. 
=* Dr. Coues says that four primaries are excised, but we do not find this to be the case, 
