44 



KEY TO FAMILIES. 



Order V. Anseres. — Docks, Geese, and Swans. 



Toes four, tlio front ones fully webbed ; tarsus not strikinp;ly flattened as 

 in the Grebes; tail always wcli developed; bill with tootlilike projec- 

 tions, fluted ridges, or gutters along its sides. 

 1. Bill very long, narrow, and rounded, with numerous toothlihe pro- 

 jections along its sides. . . . Subfamily Merginae, : Merganeehs (Fig. 

 16), p. 98. 



Fig. 16. 



2. Bill more or less flattened and ducklike. 

 A. Lores feathered. 

 a. 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 Anatinm-. 



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

 aa. Hind toe with a flap or lobe. . . . Subfamily FuUguUnm; 

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



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

 on its front rounded. , . . tiaht&mWy An serinm: Geese, p. 119. 

 -B. Lores bare. . . . Subfamily Cygninat: Swans, p. 124. 



