420 CHECK LIST OF NORTH AMERICAN BIRDS. 



Genus ANSER Brisson. 



Anser Brisson, Orn., 1760, I, 58; VI, 261. Type, by tautonymy, Anser 

 domestica Brisson = Anas anser Linnaeus. 



Anser filbifrons (Scopoli). White-fronted Goose. 



Branta albifrons Scopoli, Annus I, Historico-Naturalis, 1769, 69. 



Modern form reported from Pleistocene: Fossil Lake, Oregon; Upper San 

 Pedro formation, San Pedro, California. 



Anser condoni Shufeldt. 



Anser condoni Shufeldt, Journ. Acad. Nat. Sci. Phila., ser. 2, IX, sig. 53, 

 1892, 406, pi. xvi, figs. 19, 26, 27. 

 Pleistocene: Fossil Lake, Oregon. 



Genus CHEN Boie. 



Chen Boie, Isis von Oken [X], 1822, Heft v (May), col. 563. Type, by 

 monotypy, Anser hyperboreits Pallas. 



SuBGENDS CHEN Boie. 



Chen hyperborea (Pallas). Snow Goose. 



A^iser hyperboreus Pallas, Spic. Zool., I, Fasc. vi, 1769, 25. 



Modern form reported from Pleistocene: Fossil Lake, Oregon; McKittrick, 

 California. 



Chen caerulescens (Linnaeus). Blue Goose. 



Anas CctrulesceJis Linnaeus, Syst. Nat., ed. 10, I, 1758, 124. 

 Modern form reported from Pleistocene: Fossil Lake, Oregon. 



Subfamily DENDROCYGNINAE. Tree-ducks. 



Genus DENDROCYGNA Swainson. 



Dendrocygna Swainson, Classif. Birds, II [July 1], 1837, 365. Type, by 

 subs, desig., A7ias arcuata Horsfield (Gray, 1840). 



Dendrocygna eversa Wetmore. 



Dendrocygna eversa Wetmore, Proc. U. S. Nat. Mus., LXIV, Art. 5, Jan. 

 15, 1924, 3, figs. 1-2. 



Upper Pliocene: Near Benson, Arizona. 



