69. HARPAGrs. 361 



Key to the Species. 



a. Adult with rufous axillaries and under wing-coverts. 

 Younff white below, breast streaked with black ; 



thighs rufous in adult and young diodon, p. 361. 



6. Adult with white or cream-coloured axiUaries. 

 a'. Entirely chestnut underneath or greyish, with the 

 lower breast and abdomen barred with white and 



ashy grey bidentatus, p. 362. 



h'. Broadly' banded imdemeath with chestnut and 



white fasciatus, p. 363. 



1. Harpagus diodon. 



Falco diodon, Tenim. PL Col. i. pi. 198 (1824) ; Max. Beitr. Om. 



Bras. iii. Abth. i. p. 138 (1830) ; Burm. Th. Bras. ii. p. 102 (1856) ; 



Schl. Mm. P.-B. Falc. p. 34 (1862) ; id. Remie Accipitr. p. 47 



(1873). 

 Bidens femoralis, Sjn'x, Av. Bras. i. p. 15, pi. 8 (1824). 

 Harpagus diodon, Vig. Zool. Journ. i. p. 338 (1825) ; Bp. Consp. i. 



p. 28 (1850) ; Kaup, Contr. Om. 1850, p. 53 ; Bp. Rev. et Mag. 



de Zool. 1854, p. 537 ; StricU. Om. Sgn. p. 102 (1855) ; Pelz. Om. 



Bras. p. 5 (1871); Scl. ^ Salv. Nomenel. p. 122 (1873). 



Adult. Above slaty grey, the head a little darker ; quills dark 

 brown, broadly barred with white on the inner web, the inner 

 secondaries slaty grey, both these and the scapulars marked with 

 concealed spots of white ; tail dark brown, tipped slightly with 

 greyish white, with bars of greyish white, much narrower than the 

 alternate brown bands ; sides of face slaty grey, a little lighter than 

 the head ; throat and under tail- coverts white, the former with a 

 faint indication of a blackish median line ; rest of under surface 

 pale grey, the thighs bright ferruginous ; under wing-coverts fer- 

 ruginous, the lower ones white, barred with blackish ; bill blackish 

 brown, lower mandible yellowish ; feet yellow, claws horn-brown. 

 Total length 12-2 inches, culmen 0-8, wing 8*1, tail 6, tarsus 1*55. 



Young. Brown above, all the feathers edged with pale ochre ; 

 secondaries and tail-feathers tipped with white ; nape and sides of 

 neck also mottled with brown and white ; fore part of cheeks white, 

 streaked with brown, the rest of the side of the face browTi, like the 

 head, slightly varied with streaks of lighter brown ; under surface 

 of body white, with a narrow streak of brown down the centre of 

 the throat, aU the breast-feathers marked down the centre with 

 pear-shaped drops of dark brown, becoming narrower and more 

 linear on the abdomen ; thighs pale ferruginous ; under wing- 

 coverts pale buflp, slightly spotted with black on the lower ones, the 

 axillaries pale ferruginous, with indications of whitish cross bars. 



Hab. Brazil. 



