6o CHECK-LIST OF NORTH AMERICAN BIRDS. 



Genus NOMONYX Ridgway. 



Nomonyx Ridgw. Pr. U. S. Nat. Mus. III. 1880, 15. Type, Anas 

 dominica Linn. 



[168.] Nomonyx dominicus (Linn.). 



Masked Duck. 



Anas dominica Linn. S. N. ed. 12, 1766, 201. 



Nomonyx dominicus Ridgw. Pr. U. S. Nat. Mus. III. 1880, 15. 



[B610, C 520, R 635, C 742.] 



Geog. Dist. — Tropical America in general, including West Indies, 

 north on the Gulf coast to the Lower Rio Grande ; accidental in 

 eastern North America (Wisconsin ; Lake Champlain ; Massachusetts). 



Subfamily ANSERINiE. Geese. 



Genus CHEN Boie. 

 Chen Bote, Isis, 1822, 563. Type, Anser hyperboreus Pall. 

 169. Chen hyperborea (Pall.). 



Lesser Snow Goose. 



Anser hyperboreus Pall. Spicil. Zool. VI. 1769, 25. 

 Chen hyperborea Boie, Isis, 1822, 563. 



[B— , C 480^, R 591^;, C 696.] 



Geog. Dist. — Pacific coast to the Mississippi Valley, breeding in 

 Alaska ; south in winter to southern Illinois and southern California ; 

 casually to New England. Northeastern Asia. 



169 a. Chen hyperborea nivalis (Forst.). 



Greater Snow Goose. 



Anas nivalis Forster, Philos. Trans. LXII. 1772, 413. 

 Chen hyperboreus nivalis Ridgw, Pr. Biol. Soc. Wash. II. 1884, 

 107. 



[B 563, C 480, R 591, C69S.] 



Geog. Dist. — North America, breeding far north (east of Macken- 

 zie basin) and migrating south in winter, chiefly along the Atlantic 

 coast, reaching Cuba. 



