44 WATER FOWL. 



EXANTHEMOPS ROSS I I. 



Geographical Distribution. Arctic America, south in winter 

 to Southern California, east to Montana. 



Adult. Entire plumage, pure white, with the exception of 

 the primaries, which are black. Bill, dull red; nail, white, with- 

 out any black line along the gape. Basal portion of maxilla 

 covered with wart-like excrescences. Legs and feet, reddish. 

 Average total length, 23 inches; wing, I4 T V, tarsus, 2 T %; cul- 

 men, I T \. 



Young. Resemble those of the Lesser Snow Goose, but are 

 of a generally lighter color. . 



