Falco ptilorhyncus Temminck, Pl. Col. livr. 8 (1821), 1, 44.
Pernis ptilonorhynchus Sharpe, Cat. Birds Brit. Mus. (1874), 1,
347; Hand-List (1899), 1, 271; Oates, Cat. Birds' Eggs (1902), 2,
293, pl. 14, fig. 4; McGregor and Worcester, Hand-List (1906), 44.
Pernis cristatus Blanford, Fauna Brit. Ind. Bds. (1895), 3, 406
(part), fig. 98 (head); Grant, Ibis (1897), 213.
Cebu (Bourns & Worcester); Luzon (Whitehead, Bourns & Worcester);
Mindanao (Everett, Celestino, Goodfellow); Mindoro (McGregor);
Palawan (Whitehead, Platen); Romblon (McGregor); Samar (Whitehead);
Sibuyan (Bourns & Worcester); Sulu (Platen, Bourns & Worcester);
Tablas (Celestino). Indian and Malay Peninsulas, Indo-Chinese
countries, Ceylon, Greater Sunda Islands.
Adult.--Upper parts brown, many of the feathers white basally; top of
head, neck, and sides of neck light brown with heavy black shaft-lines;
long crest-feathers black; scale-like feathers of lores and side of
head ashy gray; chin, throat, and breast white with black shaft-lines
and many feathers with long wide terminal spots of black or dark brown
on the throat, forming a median and two lateral stripes; abdomen,
thighs, and under tail-coverts light brown, barred with white; under
surface of primaries and secondaries light gray, banded with dark
brown, the basal bars broken; axillars and wing-lining tawny-brown,
the latter mottled with white; tail from above light brown, with five
or six wide bars of dark brown; from below the tail is light gray,
crossed by dark brown bars. Bill black, its base bluish; iris bright
yellow; legs dull yellow; nails black. A male from Mindoro is 570
in length; wing, 390; tail, 285; culmen from base, 33; tarsus, 45;
middle toe with claw, 58.
A breeding female, taken in Mindoro, February 19, 1905, is 610 in
length; wing, 395; tail, 290; culmen from base, 36; tarsus, 44.
Genus BAZA Hodgson, 1836.
Bill stout, culmen well curved; cutting edge with two teeth, in young
birds there is often a single tooth; cere small; nostrils narrow,
slightly oblique; crest long and narrow; wing moderate, third or
fourth quill longest; tail square; tarsus short, feathered in front
for half its length, naked part reticulate. The key is based on the
plumage of the young females; the adult of leucopais is unknown.
Species.
a1. Breast banded with pale rufous; a black streak down center of
throat. ... magnirostris (p. 236)
a2. Breast not banded; no black streak on throat; entire under parts
pure white. ... leucopais (p. 237)