80 



DUCKS, GIOKSE AND SWANS OF NOUTH AMERICA. 



Subfamily ANSERIN.E. Geese. 



Genus CHEN Boie. 



CHEN HYPERBOREA {Pall.). 



Lesser Snow Qoose. 



AduJt: General plumage, white; primaries, Ijhick; and pi-iinary coverts, pale ash. 

 Tlie immature bird has the head, neek, and upper parts, mottled gray and white; the rump and 

 tail are white ; under parts, white. 



Length, 23 to ,30; wing, 14 to 17.50; liill, 2 to 2..3.5. 



Clieii hyperljorea. 



Iliibitiit: "Pacific coast to tlie Mississippi Valley, breeding in Alaska, south in winter to 

 .Soutliern Illinois and Southern California, casually to New England, Xortheastern Asia." 

 (A. O. U.) 



This species is rarely seen cast of tlie Missiwuippi Valley ; it is common on 

 the Pacific coast. It breeds in Alaska ; the eags, according to Baird, Brewer 

 ct Ridgway (N. A. Bds.) are, "uniform, dirty chalky white and measure 

 3.40 X 2.20." 



