362 FALCONID^. 



2. Harpagus bidentatus. 



Notched Falcon, Lath. Gm. Syn. Supjil. p. 34 (1787). 



Falco bidentatus, Lath. Ind. Orn. i. p. 38 (1790) ; Baud. Traite, ii. 



p. 118 (1800) ; Temm. PI. Col. i. pis. 38, 228 (1823) ; Max. Beitr. 



Orn. Bras. iii. Abth. i. p. 132 (1830) ; Schl. Mm. P.-B. Falc. p. 35 



(1862). 

 Bidens rufiventer, Spiv, Av. Bras. i. p. 14, pi. 6 (1824). 

 Bidens albiventer, Sjnx, Av. Bras. i. p. 14, pi. 7 (1824), 

 Harpagus bidentatus, Vig. Zool. Journ. i. p. 338 (1825) ; Gray, Gen. 



of B. i. p. 22 (1844) ; Cah. %■ Tschudi, Faun. Peruan., Vog. pp. 18, 



107 (1845) ; Katip, Contr. Or7i. 1850, p. 54 ; Bp. Consp. p. 28 



(1850) ; id. Rev. et Mag. de Zool. 1854, p. 537 ; Strickl. Orn. Syn. 



p. 101 (1855) ; Burm. Th. Bras. ii. p. 100 (1856) ; Lawr. Ann. 



Lye. N. Y. vii. p. 317 (1861) ; Scl. ^ Salv. P. Z. S. 1864, p. 369, et 



1866, p. 198 ; Leot. Ois. Trmid. p. 28 (1866) ; Scl. 4'- Salv. P. Z. S. 



1867, pp. 753, 979 ; Fimch, P. Z. S. 1870, p. 556 ; Pelz. Orn. Bras. 

 p. 5 (1871) ; Scl. 8f Salv. Nomencl. p. 122 (1873). 



Diodon brasiliensis. Less. Traite, p. 96 (1831). 



Diodon bidentatus, HOrb. Voy. Am. Merid., Ois. p. 122 (1835-44). 



Harpagus rufipes, Swains. Classif. B. ii. p. 213 (1837). 



Young. Above brown, with very narrow pale rufous edgings to 

 the feathers ; upper surface more or less mottled with white, where 

 the concealed bases to the feathers show through, especially on the 

 nape ; quills and tail brown, tipped with white, barred with paler 

 brown above, and with whitish beneath ; sides of the face brown, 

 except the fore part of the cheeks, which are white, with brown 

 streaks ; under surface of body white, the throat with a conspicuous 

 mesial black streak, the throat and chest narrowly streaked with 

 dark brown, flanks with a few indistinct arrow-head brown mark- 

 ings ; under wing-coverts buffy white ; biU horn-brown, yellowish 

 on lower mandible and along ridge of upper; feet deep yellow, 

 claws black. 



From this stage the bii'd moults into the following plumage of 

 the full-grown bird. 



Adult male. Above clear slaty blue ; taU brown, tipped and 

 crossed with three narrow bands of greyish white or pale brown ; 

 under surface of body rich chestnut ; throat white, with a broad 

 mesial line of slaty black ; under tail- and wing-coverts, as well as 

 axUlary plumes, creamy white ; bill slaty black, yellowish on the 

 under mandible ; feet yellow, claws black. Total length 12-3 inches, 

 culmen 0*9, wing 8, tail 6-2, tarsus 1-45. 



Adult female. Similar to the adult male but larger, and having 

 the abdomen and thighs barred obscurely with whitish. Total 

 length 15 inches, culmen 0-9, wing 9*1, tail 6-7, tarsus 1-6. 



From the above dress the bird changes again gradually, not by a 

 moult apparently, into the fully mature plumage as follows; — 

 Above slaty black, with a tinge of clearer slaty grey on the sides of 

 the face ; quills blackish, barred with white underneath ; taU black, 

 narrowly tipped with white, with only two cross bands visible on 

 the tail itself, whitish below, tinged with pale brown above ; throat 

 white, with the usual black streak ; chest greyish, the lower chest, 



