32 ACCIPITEES. 



Hume, Nests mid Eggs Ind. Bds., p. 48 (1873) ; Salvad. Cat. Ucc. 

 Born., p. 5 (1874); id. Ann. Alus. Civ. Gen., vol. vii, p. 750 

 (1875) ; I)' Alb., Sijdn. Mail, 1877, p. 248; Meyer, Ilns, 1879, p. 

 56; Salvad. Orn. Pap. et Molucc, vol. i, p. 7 (ISSO) ; id. Voy. 

 Chall. Bds., p. 73 (1881); Bias. Proc. Zool. Soc, 1882, p. 698; 

 Guill. Proc. Zool. Soc, 1885, p. 562 ; Salvad. Agrjiunte. Orn. Pap. 

 et Molucc, p. 11 (1889); id. Ann. Mus. Civ. Gen., 2nd ser., vol. 

 xvi, p. 58 (1896). 



Blagrus leucogaster, Blyth, Cat. Bds. Mus. As, Soc Beng., p. 30 (1849); 

 id. Ibis, 1863, p. 22; Swinhoe, Ibis, 1870, p. 86; Blyth, Bds. 

 Burmah, p. 64 (1875). 



Cuncuma leucogastra, Sclater, Ibis, 1859, p. 328. 



Polioaetus leucogaster, Goidd, Handbk. Bds. Austr., vol. i, p. 13, sp. 

 3 (1865) ; Ramsay, Proc Zool. Soc, 1875, p. 578. 



Adult female. The whole of the head and neck, and all the 

 under surface of the body and under wing-coverts white, some 

 of the lateral wing-coverts shaded with ashy-grey on the outer 

 webs, the greater coverts, ashy-grey becoming white at the base, 

 and shaded with white along the margins and at the tips ; re- 

 mainder of the under surface of the wings ashy-grey, the 

 primaries shaded with a blackish tinge towards the tips, and the 

 secondaries shaded with white at the tips ; tail ashy-black towards 

 the base, the terminal third being white ; the inner webs on the 

 under surface mottled with white, and the extreme base white ; 

 under tail-coverts white, concealing the ashy-black basal portion ; 

 the upper surface of the body and wings ashy-grey ; the tips of 

 the primaries blackish, and upper tail-coverts dark ashy-grey ; 

 the basal portion of the tail above ashy-black ; the secondaries 

 slightly margined at the tips with ashy-white ; iris yellowish- 

 brown ; cere, lores, and base of the bill lead-colour ; culmen 

 greenish-brown ; feet yellowish ; claws black. Total length 30 

 inches, wing 288, tail 11'7, tarsus 4'1, bill 2'4, culmen 3"0, 

 middle toe 3"0, hind toe 1"6. 



Adult male. Is the same in plumage, but slightly smaller in 

 size. Total length 28"5 inches, wing 223, tail 10'5, tarsus 

 4-0, bill 2-0, culmen 2-6, middle toe 2-9, hind toe 1-G. 



Progress towards maturity. The throat, abdomen, flanks, and 

 under tail-coverts become white first ; the chest retaining its 

 brown markings until about the third year, when a broad central 

 line of Avhite, with a brown or black hair line down the shaft, 

 appears ; the white and brown markings of the body above grow 

 out and change to ashy-grey, which increases and becomes darker 

 in tint each year until the basal portion of the tail and the tips of 

 the primaries past the notch become in the adult almost black ; 

 the brown on the terminal third of the tail becomes freckled, 

 and lastly white, like the head and neck ; in some apparently 

 adult birds there is a hair-line of black or brown down the shaft 

 of many feathers on the chest, head, and neck. 



