44 



KEY TO FAMILIES. 



Order V. Anseres* — Ducks, Geese, and Swats^s. 



Toes four, the front ones fully webbed ; tarsus not strikinorly flattened as 

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

 tions, fluted ridges, or gutters along its sides. 



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

 jections along its sides. . . . Subfamily Mergino&: Mekgansers (Fig. 

 16), p. 98. 



"""tA^t ^ k^' '^^^''^'^-^*^ ^» » ^ f*^1 



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 Anatin(z\ 



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

 a2. Hind toe with a flap or lobe. . . . Subfamily Fuligulinoe,^ 

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



Fig. 17. 



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

 on its front rounded. . . . Subfamily Anserince : Geese, p. 119. 

 £. Lores bare. . . . Subfamily Cygnince: Swans, p. 124. 



