XX11 CONTENTS. 



Page 



Genus CHEN 117 



Chen albatus. Cassin's Snow Goose 117 



Genus BERNICLA 117 



Bernicla brenta. Brent Goose 117 



Bernicla leucopsis. Barnacle Goose 118 



Bernicla canadensis. Canada Goose 118 



Beruicla ruficollis. Red-breasted Goose 119 



Genus CYGNUS 119 



Cygnus olor. Mute Swan 119 



Cygnus immutabilis. Polish Swan 120 



Cygnus musicus. Whooper Swan 120 



Cygnus americanus. American Swan 120 



Cygnus buccinator. Trumpeter Siuan 121 



Cygnus bewicki. Bewick's Swan 121 



Genus CAIEINA 121 



Cairina moschata. Muscovy Duck 121 



Genus TADORNA 122 



Tadorna cornuta. Common Sheldrake 122 



Tadorna casarca. Ruddy Sheldrake 122 



Genus &x 123 



&x sponsa. Summer Duck 123 



Genus MARECA 123 



Mareca penelope. Wigeon 123 



Mareca americana. American Wigeon 124 



Genus DAFILA 124 



Dafila acuta. Pintail 124 



Genus ANAS 125 



Anas boscas. Wild Duck 125 



Genus CHAULELASMUS 125 



Chaulelasmus streperus. Gadwall 125 



Genus QUERQUEDULA 126 



Querquedula circia. Garganey 126 



Querquedula discors. Blue- winged Teal 126 



Querquedula crecca. Common Teal 127 



Querquedula bimaculata. Bimaculated Duck 127 



Querquedula carolinensis. American Green-winged 



Teal 127 



Genus SPATULA 128 



Spatula clypeata. Shoveller 128 



