20. ERrXHHOCJs-EJIA. 85 



1 . Erythrocnema unicincta. 



Gavilan mixto otscuro y canela, Azara, Aptint. i. p. 94(1802); 



Hartl. Iml Azara, p. 2 (1847). 

 Fiilco uuiciuc'tus, Teimn. I'l. Col. i. pi. 813(1824). 

 Morplmus iiniciHctu'i, ie.s.s. Man. i. p. 90 (1828). 

 Astur uuiciiictus, Cuv. JReqne An. i. p. 332 (1829) ; Gray, Gen. B. 



i. p. 27 (1849) ; StrkM. Orn. Sijn. p. 221 (1855). 

 Nisus unicinctus, Lem. Trnite, p. Ul (18.j1). 

 Falco harrisii, Aud. li. N. Am. pi. .392 (1831) : id. Orn. Bioqr. v. 



p. 30(1849). 

 13uteo harrisii, Bp. Cumj). List B. Etir. 8f X. Am. p. 3 (1838); 



Auduh. Si/n. B. X. Am. p. 5 (1839). 

 Buteo unicinctus, Grai/, Cat. Accipitr. 1844, p. 18; id. Hand-l. i. 



p. 7 (1869). . 



Polyborus tteniurus, T»chiuU, Arch. f. Natiirg. 1844, p. 263 ; id. Faun. 



Peruan. pi. 1 (1844). 

 Hypomoiiihnus unicinctus, Cab. Arch. f. Naturg. 1844, p. 221 ; Cab. 



^- Tschiidi, Faun. Peruan. pp. 17, 85"(1844). 

 Spizag-erauus unicinctus, Eaup, JIus. Senck. iii. p. 260 (1845); Scl. 



P. Z. S. 1860, p. 288. 

 Craxirex unicinctus, Bp. Rev. et Mag. dc Zool. 1854, p. 537. 

 Asturina unicincta. Burin. TIi. Bras. ii. p. 82 (1855) ; id. Bei.i. La 



Plafa-St. ii. p. 436 (1801) ; ScM. Mas. P.-B. Asturinfe, p. 2 (1862). 

 Urubitinga unicincta, Scl P. Z. S. 1858, p. 150 ; Pelz. Orn. Bras. 



pp. 2, 394 (1871). 

 Craxirex harrisii, Cones, Pr. Phil. Acad. 1806, p. 49; Cooper, B. 



Calif, ed. Baird, p. 493 (1870). 

 Buteo unicinctus, var. harrisii, Cones, Key N. A. Birds, p. 215 



(1872). 



Young. Brown mth rufous margins to the feathers, especially on 

 the head, forming a distinct eyebrow ; lores and feathers below the 

 eye whitish ; sides of face and neck behind, as well as on the sides, 

 rufous ochre, with brown centres to the feathers ; wing-coverts 

 plainly margined with rufous, the greater aud median series largely 

 varied with rufous ochre spots aud half bars ; primaries brown, ex- 

 ternally shaded with grey, the secondaries paler with rufescent tips, 

 aU barred with darker brown, plainer towards tips of inuer webs on 

 under surface, which is creamy shading into ashy white ; upper 

 tail-coverts ochraceous white, with a few small spots of brown ; tail 

 brown, rufescent on the inner web, tipped broadly with pale rufous 

 shading into butfy white, and crossed with sixteen or seventeen 

 bands of darker brown ; under surface of body rich ochre, the 

 throat sparsely streaked with dark brown, the breast with large 

 oval drops, inclining to arrow-shaped marks on the flanks aud nearly 

 absent on the vent aud under tail-coverts; thighs very narrowly 

 crossed with zigzag bars of dark brown. 



Adult. Above dusky black, deeper on head; lores whitish; sides 

 of face black, slightly streaked with white ; under surface of body 

 dusky black ; thighs bright rufous ; vent and under tail-coverts 

 white ; under wing-coverts rufous, slightly barred with black ; 

 upper wing-coverts dusky brown with rufous margins, especially on 

 the least wing-coverts, which are rufous with brown centres ; pri- 



