44 



KEY TO FAMILIES. 



Order V. Ansereo.— Ducks, Geese, and Swans. 



Toes four, tlie front ones fully webbed ; tarsus not strikinfjly flattened as 

 in the Grebes; tail always well developed; bill with toothliko projec- 

 tions, fluted ridges, or gutters along its sides. 

 1. Bill very long, narrow, an 1 rounded with numerous toothlike pro- 

 jections along it8 sides. . . . Subfamily Mergincb : Meboanskks (Fig. 

 16), p. 98. 



*M*^ ^^M ■ ' - ^^^^^^^*^^^^^ 



! 



% 



Fio. 16. 



, Bill more (>r less flattened and ducklike. 

 A. Lores feathered. 

 o. Tarsus shorter than the middle toe, without nail ; scales on its 

 front transverse, more or less square. 

 a>. Hind toe without a flap or lobe. . . . Subfamily AnatincB; 



River Ducks (Fig. 17, a), p. 100. 

 a*. Hind toe with a flap or lobe. . . . Subfamily FuUgulince; 

 Sea and Bay Ducks (Fig. 17, b), p. 107. 



^ 1 

 3 



>5>-^ 



Fio. 17. 



b. Tarsus generally longer than the middle toe, without nail ; scales 

 on its front rounded. . . . Subfamily Atiserinm; Geese, p. 119. 

 £. Lores bare. . . . Subfamily Ci/gninw. Swans, p. 124. 



