La-uin′, Manila; ma-na-o′, Calayan, all species of small hawks.

Batan (Edmonds); Calayan (McGregor); Luzon (Heriot, Whitehead); Mindanao (Platen); Mindoro (Everett); Palawan (Whitehead, Everett); Sulu (Guillemard). Eastern Siberia; in winter to China, Indo-Burmese countries, and Malay Archipelago.

Adult male.—Above black, nape and hind neck narrowly streaked with white; feathers of lower back and rump tipped with ashy gray or white; sides of head and ear-coverts black; lower parts white; chin, throat, and breast with bold black shaft-streaks; primaries black, white for basal third; alula, primary-coverts, and secondaries ashy white with blackish shafts; secondary-coverts black, more or less mixed with ashy white; under coverts and axillars white; tail ashy white; upper tail-coverts white. Iris bright yellow; legs dull yellow; cere waxy green; bill and nails black. The above specimen from Tarlac Province, Luzon, measures, 520 in length; wing, 410; tail, 230; culmen from base, 33; tarsus, 92; middle toe with claw, 63.

Younger male.—Color pattern similar; upper parts brown; white streaks on head and neck more numerous; under parts white with wider streaks of reddish brown which are also present on flanks and abdomen; primaries black, some of them barred with ashy white; wing-coverts brown with less white than the adult; primary-coverts and alula ashy white but with blackish brown bars; under wing-coverts white, streaked with blackish brown; axillars white, streaked and barred with reddish brown. Length, 533; wing, 400; tail, 235; culmen from base, 32; tarsus, 80; middle toe with claw, 61.

“Adult female.—Above brown slightly shaded with ashy, the dorsal feathers obsoletely margined with dull rufous; crown and hind neck tawny-buff, paler on the neck, all the feathers mesially streaked with brown; scapulars and wing-coverts margined and barred with tawny or fulvous, the least wing-coverts more conspicuously margined with rufous; quills brown, narrowly tipped with whitish, externally shaded with ashy gray, the secondaries less distinctly, and all barred across with darker brown; under surface of wing white, the dark bars showing very distinctly; lower back and rump brown, the feathers distinctly tipped with pale rufous; upper tail-coverts pure white; tail ashy gray, tipped with fulvous and crossed with five blackish bands, the subterminal one much the broadest, the ashy gray interspaces inclining to or replaced by pale tawny on the outer feathers; lores as well as a distinct eyebrow and ear-coverts buffy white; sides of face and of neck, as well as the facial ruff, rufous-buff streaked with dark brown; under surface of body creamy buff, with central pointed marks of rufous-brown to the feathers, more distinct on the fore neck and under wing- and tail-coverts; flank-feathers and axillars rufous-brown, with large rounded spots of creamy buff on both webs; under wing-coverts and thighs creamy buff, with irregular central streaks of rufous-brown occupying the major part of the greater under wing-coverts. Length, 584; wing, 394; tail, 279; tarsus, 79.” (Sharpe.)

“Adult female.—Brown above, the feathers throughout with pale rufous edges; tail-coverts white and rufous; tail with about six dark cross-bands, which disappear in old individuals; lower parts buff, with broad rufous-brown shaft-stripes. The quills are dark brown but become grayish in old birds.

“Young birds so closely resemble those of C. æruginosus as to be indistinguishable at times. The pale head and neck-feathers are always striated in C. spilonotus, but the body, wings, and tail are uniform brown or variegated with buff on the wing-coverts, back, and breast. Generally, though not invariably, traces of bars will be found on some of the tail-feathers of C. spilonotus, but this occasionally happens in C. æruginosus also.

“Length, of male, 508; tail, 235; wing, 394; tarsus, 89; tail of female, 254; wing, 419; tarsus, 94.” (Blanford.)

174. CIRCUS MELANOLEUCOS (Pennant).