Nettion Jlaup, Skizz. Entwick. Nat. Syst, p. 95 (1829).
Type by mon., Anas crecca Linn.
Nettion differs from Anas in its small size, small, narrow and tapering bill and in having fourteen or sixteen tail-feathers instead of eighteen or twenty.
Key to Species.
A. Speculum ; outermost secondaries black with white tips, those next them brilliant metallic green, next to them again one black, others like the back………N. crecca, p. 431.
B. Speculum; secondaries bronze-green at base, then black and tipped white and their coverts tipped rufous………… N. formosum, p. 433_
C. Speculum; outer secondaries black, except two or three in the centre which are bronze-
green………… N. albigulare, p. 435.