The members of this subfamily and genus differ from all other Philippine ducks in having a tuft of long feathers springing from the crown; the bill also is characteristic being short and wide and slightly wider at tip than at base.

Species.
164. MARILA MARILA (Linnæus).
SCAUP DUCK.

Luzon (Parsons). Northern parts of Europe, Asia, and North America; wintering on the Mediterranean, Black, and Caspian Seas and in India, China, Japan, and Central America.

“Adult male.—Head, neck, upper part of breast and back black; sides of the head and upper neck glossed with green; rest of back and scapulars white, narrowly barred with black; rump, upper and under tail-coverts black; lower breast, abdomen, and sides white; vent somewhat grayish; sides with black barrings; upper wing-coverts blackish, finely vermiculated with white; secondaries white, forming the speculum, which is bounded below by a blackish band, in some specimens more or less freckled with white; tertials blackish with a green gloss, the largest ones more or less finely dusted with whitish; primaries grayish brown, from the fourth quill with a whitish area on inner web, tips black; marginal under wing-coverts grayish brown dusted with white, the remainder, as well as axillars, white; tail blackish. Bill and legs light lead-gray, webs and nail of bill blackish; iris yellow. Length, about 457; wing, 235; tail, 74; culmen, 46; tarsus, 35.

“Female.—Fore part of head and chin white; rest of head, neck, and breast brown; upper parts dark brown, back and scapulars slightly vermiculated with white, under parts white below the breast; flanks brown, more or less vermiculated with white; vent and under tail-coverts dark brown, slightly vermiculated with white; wings duller and browner than in the male, the upper wing-coverts much less vermiculated with white. Bill and legs darker than in the male. Size somewhat less.

“Young male has the white at base of bill like the adult female, but it is of a darker and richer color.