u 



KEY TO FAMILIES. 



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



Toes four, the front ones fully webbed; tarsus not strikincjly fiattened 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 Merginoi i^MiiRQ an skhs (Fig. 

 16), p. 98. 



2^ 



3 



s 



g) 



Fig. 16. 



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. 

 ai. Hind toe without a flap or lobe. . . . Subfamily Anatince: 



KivER Ducks (Fig. 17, o), p. 100. 

 a?. Hind toe with a flap or lobe. . . . Subfamily Fuligulince'. 

 Sea and Bay Ducks (Fig. 17, 6), p. 107. 



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

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

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



