140 BIRDS. 



2. ANSER, Linngeus. Geese. 



1. A. a/bifrons, Gm., var. gambeli, (Hartl.) Coues. 

 White - Fronted Goose. Speckle - Bill. White or 

 gray, blotched with black; back dark; head and neck 

 grayish brown; forehead white in adult; claws pale; 

 lamellge usual; L. 27; W. 17; T. G; Ts. 3. N. Am. 



2. A. ccerulescens, L. Blue Goose. Size and form of 

 next, but plumage ashy, varied with dark brown. N. 

 Am., rather rare. 



3. A. hyperboreus, Pallas. Snow Goose. Adult pure 

 white or washed with reddish; wings with black; claws 

 dark; young bluish; lamellae very prominent; L. 30; W. 

 19; T. 6i; B. 2^. 



3. BERNICLA, Steph. Brant Geese. 



= Bernicla^ most authors. 



1. B. bernicia, (L.) Brant Goose. Head, neck, front, 

 quills, and tail, black; white patch on neck; white on 

 rump, crissum, etc.; back brownish gray; L. 24; W. 

 13; T. 5; B. 1^. Northern States; in winter to Carolina. 



2. B. canadensis, (L.) Wild Goose. Canada Goose. 

 Grayish brown, paler below; head and neck black; 

 white throat patch, extending on sides of head; tail 

 black; upper coverts white; L. 36; W. 20; T. 1^\ B. 2. 

 N. Am., abundant; U. S. in winter. 



4. ANAS, Linn.^us. Ducks. 



1. A. boscas, L. Mallard Duck. Tame Duck. <$ 

 head and upper neck rich glossy green, a white ring 

 below; breast purplish chestnut; speculum violet; wing 

 coverts tipped with black and white; $ duller, chiefly 

 dull ochraceous, streaked with dark brown; I^. 24; W. 

 12. Am., abundant; commonest westward. Original 



