34 KEY TO DUCKS, GEESE AND SWANS OF NORTH AMEKICA. 



Face and upper breast, white ; lores, black ; back of head, black. 



Barnicle Goose. 



Branta leucopsis. 

 See page 85. 



Section 2. Head, white, sometimes tinged with brownish 



orange. 



Entire plumage, white ; primaries, black. Chiefly Pacific coast to Mississippi 

 Valley, rare on Atlantic coast. Smaller than C. h. nivatis. Bill, over 1.90; 

 tarsus, over 2.80; middle toe, over 2.10. 



Lesser Snow Goose (adult). 



Chen kyperborea. 



See page 80. 



Entire plumage, white ; primaries, black ; resembles preceding species but is 

 larger (adult). Eastern North America, south in winter on Atlantic coast to 

 Florida and Cuba. 



Greater Snow Goose. 



Ohen hyperborea nivatis. 

 See page 81. 



Similar to Lesser Snow Goose, but smaller. Bill, 1.50 to 1.75; tarsus, 2.25 to 3; 

 middle toe, 1.80 to 2.05; base of upper mandible often corrugated (adult). 

 Pacific coast east to Montana ; does not occur on Atlantic coast. 



Ross's Snow Goose. 

 Ohen rossii. 



See page 82. 



Back, slaty brown ; belly and rump, gray ; the feathers, not barred ; terminal 

 half of tail, not white (adult) . 



Blue Goose. 



Ohen coerulescens. 

 Seepage 81. 



Head and nape, white ; front of throat, black ; general plumage, plumbeous 

 ash ; the feathers barred at tip with black and white ; terminal half of tail, 

 white (adult) . Alaska, usual on Pacific coast to California ; not found in Eastern 

 ISTorth America. 



Emperor Goose. 



Fhilacte canagica. 



See page 87. 



