72 Field Museum of Natural History — Zoology, Vol. IX. 



SECTION 2. Bill and feet, pink or flesh color in life; head, white, 

 sometimes tinged with brownish orange. 



Entire plumage, white; primaries, black; smaller than C. h. 

 nivalis; bill, over 1.90; tarsus, over 2.80; middle toe, over 2.10 

 (adult ) . Chiefly Pacific coast to Mississippi Valley, rare on Atlantic 

 coast. Chen hyperborea. 



Lesser Snow Goose. 

 See No. 68. 



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. 



Chen hyperborea nivalis. 

 Greater Snow Goose. 

 See No. 68a. 



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

 terminal half of tail, not white (adult). Chen ccerulescens . 



Blue Goose. 



See No. 69. 



SECTION 3. Bill, pinkish; feet, yellow or pink; head, brownish or 

 grayish, sometimes marked with white. 



Forehead and feathers at base of bill, white ; nail of bill (unguis ) , 

 whitish; bill, yellowish in dried skin; breast, grayish, more or less 

 marked or spotted with black (adult ) . 



Anser albifrons gambeli. 

 American White -fronted Goose. 

 See No. 70. 



No white on forehead or base of bill; bill, yellowish in dried skin; 

 nail of bill (unguis), dusky; rump, slaty brown; wing coverts, edged 

 with white (immature). Anser albifrons gambeli. 



American White-fronted Goose. 

 See No. 70. 



General plumage, grayish ; rump, white ; smaller than C. h. niva- 

 lis; bill, over 1.90; tarsus, over 2.80; middle toe, over 2.10 (imma- 

 ture). Chiefly Pacific coast to Mississippi Valley; rare on Atlantic 

 coast. Chen hyperborea. 



Lesser Snow Goose. 

 See No. 68. 



