17. MICRASXUE. 75 



/'". Chest white, barred with greyish 

 black. 

 e"". Head and sides of neck ashy grey . guerilla $ , p. 79. 

 /"'". Head and sides of neck orreyish 

 black, tlie latter slightly washed 



with rufous zonotJiorai J , p. 79. 



d'. Flanks uniform bright chestnut cadanilim, p. 80. 



1. Micrastur ssmitorquatus. 



Negriblanco, Azara, Apunt. i. p. 124 (1802j. 



Faxado, Azara, Apunt. i. p. 126 (1802). 



Sparvius semitorquatus, Vieill. N. Diet. d'Hist. Nat. p. 322 (1817). 



Falco leucomelas, Licht. Verz. Doubl. p. 62 (1823, ex Illiger, MS.). 



Falco brachj-pterus, Temm. PL Col. i. pis. 116, 1-H (1824). 



Astur brachypterus, Spix, Av. Bras. i. p. 9 (1824\ 



Nisus brachypterus, Less. Man. d'Orn. i. p. 98 (1828); Schl. Mus. 



P.-B. .\stures, p. 52 (1862). 

 Camifex naso, Less. Pev. Zool. 1842, p. 379. 

 Micrastur brachvpterus, Gray, List Gen. B. p. 6 (1841) ; id. Gen. 



B. i. p. -2^, pl.'lO. fig. 1 (1849); Bp. Consp. i. p. 30 (18.50); Pelz. 



Peis. Xov. Foff. p. 12 (1865) ; Grai/, Hand-l. B. i. p. 31 (1869) ; 



Pelz. Orn. Bras. pp. 7, 398 (1871). 

 Falco percontator, Cabot, Bost. Jonrn. N. H. \\. p. 462 (1844). 

 Herpetotheres brachypterus, Kauji, Contr. Orn. 18-50, p. 71. 

 Rhyuchomegus brachypterus, Bp. Rev. et 3Iag. de Zool. 1854, p. 537. 

 Micrastur semitorquatus, Strickl. Orn. Syn. p. 122 (1855) ; Scl. ^ 



Salv. P. Z. S. 1869, p. 36-5. 

 Climacocercus semitorquatus, Cab. J. f. O. 1865, p. 407. 



Young. Above dull chocolate-brown ; the crown and sides of face 

 uniform ; the ear-coverts slightly fulvescent near the base ; back 

 and wing-coverts barred and slightly tipped with pale tawny rufous ; 

 collar round neck rufous buff, mottled with dark brown ; quills 

 brown, like back, and barred with rufous in same manner ; upper 

 tail-coverts brown, barred across with ritfous white; tail brown, 

 naiTowly tipped with white and crossed with six bands of white 

 washed with rufous ; under surface of body white ; the throat un- 

 spotted ; the breast thickly barred -with brown strongly washed 

 with rufous, becoming broader and blacker on the iianks, thighs, and 

 under tail-coverts ; under wing-coverts white, spotted and barred 

 •with dark brown Hke the breast. 



Adult. Head and upper surface of body blackish, as well as a line 

 drawn down the side of the face along the hinder margin of the ear- 

 coverts ; sides of face, a collar round the hind neck, and entire under 

 parts pale ochreous fawn, including the under wing- and tail-coverts ; 

 the hind neck with a few blackish cross markings ; quills uniform 

 ^mth back, the primaries a little browner externally, all barred with 

 white on the inner web ; upper tail-coverts blackish, barred and 

 tipped with white ; tail blackish, tipped with white and crossed with 

 three bands of white, not strictly conterminous on outer feathers. 

 Total length 20 inches, culmen l4, wing 10-4, tail 10-3, tarsus 3-25. 



Obs. Very old birds appear to become quite white below and to 

 Lave a white collar. 



