208 FALC0NID.5:. 



6. Asturina nattereri. 



Falco magnirostris (pt.), Spix, Av. Bras. i. p. 18 (1824). 



Falco magnirostris, Temm. PL Col. i. pi. 86 (1824) ; Max. Beitr. iii. 



p. 102 (1830). 

 Nisus magnirostris, Cah. ^ Tsch. Faun. Peruan. p. 104 (1844-46) ; 



Burm. Th. Bras. ii. p. 76 (1856). 

 Astur magnirostris, Peh. Orn. Bras. pp. 6, 398 (1869-71). 

 Asturina nattereri, Scl. Sf Salv. P. Z. S. 1869, p. 132 ; iid. Hx. Orn. 



pi. Ixxxvii. (1869) J iid. Nomencl. p. 118 (1873). 



Adult. Above ashy brown, the head much clearer and inclining 

 to ashy grey ; quills deep chestnut, inclining to brown at the tips, 

 the exterior primaries brown on the outer web, the secondaries ex- 

 ternally ashy brown, the innermost entirely of that colour, like the 

 back, all the quills marked with narrow black bars, a little broader 

 but more indistinct on the secondaries, the inner face of the wing 

 pale creamy rufous, with slight indications of blackish bars ; lower 

 upper taU-coverts buffy white, tinged mth ochre, and barred with 

 dark brown ; tail clear ashy brown, tipped with whitish, and crossed 

 with three bands of blackish ; throat ashy grey, slightly varied with 

 whitish ; chest pale rufous, the shafts distinctly indicated by narrow 

 central black lines ; rest of the under surface fulvous, barred with 

 pale rufous, decreasing in number and distinctness on the abdomen 

 and under wing- and tail-coverts ; the thighs fulvous, very thickly 

 banded with pale rufous. Total length 14-5 inches, culmen 1*3, 

 wing 9-2, tail 6-5, tarsus 2-4. 



Young. Above brown, some of the wing-coverts margined with 

 fulvous or pale rufous ; forehead, crown of head, and hind neck, as 

 well as the interscapulary region, varied with creamy white; a 

 tolerably distinct eyebrow, cheeks, and ear-coverts creamy white, 

 streaked with brown ; quills brown, barred with blackish, the 

 secondaries tipped with dull white, the inner webs creamy buff at 

 the base, slightly washed with rufous, the cross bars showing very 

 plainly on the light ground ; upper tail-coverts creamy buif, barred 

 with brown ; tail ashy brown, inclining to creamy buff at the base, 

 especially on the inner web, crossed with five bars of dark brown, 

 and tipped with dull white ; under surface buffy white, the throat 

 narrowly, the chest broadly streaked with dark brown, the streaks 

 on the latter widening out towards the tip of the feather ; the lower 

 breast and flanks spotted and barred with heart- or arrow-shaped 

 spots of pale rufous, each spot enclosed in a narrow border of brown ; 

 vent and under tail-coverts buffy white, unspotted ; thighs buff, 

 thickly banded with pale rufous ; under wing-coverts buff, with 

 numerous pale rufous cross markings, the axillaries plainly barred 

 -with rufous, the lower coverts spotted with blackish. 



Ohs. The next stage is very similar, being a little more uniform 

 dark brown above, with few rufous edgings to the feathers : the 

 markings on the breast are more rufous, and the bars on the inner 

 face of the wing narrow, while a clearer shade of rufous is also 

 here apparent ; the throat streaked with ashy brown. The progress 



