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



Wing, 16.25; tail, 5.75; tarsus, 2.75; bill (culmen), 2.37; bill, 

 (nostril to tip), 1.37. 



The Blue Goose is not uncommon along the Mississippi Valley 

 during the migrations and occurs both in Illinois and Wisconsin, 

 usually associated with White-fronted Geese or Snow Geese. 



Genus ANSER Brissoii. 



70. Anser albifrons gambeli (Hartl.). 

 American White-fronted Goose. 



Local names: Brant. Speckle-belly. Yellow-legged Goose. 



Distr.: Northern North America, rare on the i\tlantic coast; 

 breeds in Alaska and winters in southern United States from southern 

 Illinois southward and west to Texas, Mexico, and Lower California. 



Adult: Forehead and base of bill, zvhite; the rest of the head, 

 brownish; neck, grayish brown, shading into dull white in front; 



White-fronted Goose. 



under parts, whitish, the breast showing black markings; back, ashy 

 gray, the feathers edged with brown on the upper part; shafts of 

 quills, white; bill, pinkish or reddish or pale white; feet, yellow. 



The immature bird is similar, but shows no white on the base of 

 the bill, or black markings on the breast. 



Length, 28; wing, 16; bill, 2; tarsus, 2.90. 



