162 FALCONIBJE. 



Nostril of T. albicaudatus, with no tubercular process. 



Key to the Species. 



a. Underneath white ; throat Hack ; tail white, with 



black band albicaudatus, p. 102. 



h. Underneath entirely black ; tail black, banded with 



grey abbreviatns, p. 163. 



1. TachjrtriorcMs albicaudatus. 



Aquila coliblanca, Azara, Apiod. i. p. GO (1802). 



Buteo albicaudatus, Vieill. N. Diet. iv. p. 477 (1816) ; Pucker. Ren. 



ct Mag. 1850, p. 87 ; StricU. Orn. Syn. p. 35 (1855). 

 Spizaetus leucurus, Vieill. N. Diet, xxxii. p. 59 (1819). 

 Falco pterocles, remm. PI. Col. i. pis. 56, 139 (1823). 

 Buteo pterocles, Less. Man. d'Orn. i. p. 103 (1828) ; Gray, Gen. B. 



i. p. 12 (1849) ; Cah. in Schumb. Reis. Giiian. iii. p. 739 (1848) ; 



Burm. Th. Bras. ii. p. 49 (1855) ; Sc/d. Mas. P.-B. Buteones, p. 13 



(18G2) ; Grai/, Hancl-l. B. i. p. 8 (1809) ; Pels. Orn. Bras. pp. 3, 



390 (1871) ; 'Sel. i^- Salv. Nomencl. Av. Neotr. p, 119 (1873); &cM. 



Mas. P.-B. Revue, Accipitr. p. 110 (1873). 

 Buteo albicauda. Less. Traite, p. 81, pi. 15. fig. 2 (1831) ; Pticher. Rev. 



et May. de Zool. 1850, p. 214. 

 Tacbytriorchis pterocles, Kaup, Classif. Sauq. n. Voq. p. 123 (1844) ; 



ul.'Confr. Orn. 1850, p. 75; Bp. Consp. i." p. 17 (1850). 

 Buteo tricolor, TIart.l. Lid. Azara, p. 1 (1847, nee D'Orb,). 

 Buteo leucurus, Lafr. Rev. Zool. 1849, p. 100. 



Youncf. General plumage black, the bases to the feathers white, 

 the small wing-coverts margined, and the scapulars with concealed 

 rufous spots, indicative of the approaching rufous of the adult; 

 greater wing-coverts indistinctly margined with paler brown ; quills 

 blackish brown, shaded externally with ashy grey, and barred with 

 blackish, the secondaries browner, barred with blackish, all the bars 

 showing more plainly below on the inner web, which is more or less 

 Avhite from the base upwards ; upper tail-coverts brown, white at 

 base, the outer ones white, tipped with brown ; tail bluish grey, 

 crossed with 16 or 17 blackish bands, somewhat indistinctly: head 

 black, lores conspicuously white, an indistinct eyebrow, sides of 

 neck and hinder part of the latter streaked with fulvous or bu% 

 white ; throat black ; under surface of body fulvous, more or less 

 varied Avith black on each feather, taking the form of bars on the 

 flanks and thighs and almost disappearing on the under tail-coverts ; 

 under wing-coverts white, mottled with black, like the breast ; axil- 

 laries black, tipped and spotted with white. 



A'lnlt mule. Above slaty grey, darker on the head, the small sca- 

 pulars and some of the least wing-coverts ferruginous ; lower back. 



