44 



KEY TO FAMILIES. 



Order V. Anseres. — Dnoks, Geese, and Swaws. 



Toes four, the front ones fully webbed ; tarsus not strikingly 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 Mergincn : M-ebgaitbees (Fig. 

 16), p. 98. 



FiQ. 16. 



2. Bill more or less flattened and duoklike. 

 A. Lores feathered. 

 a. Tarsus shorter than tie middle toe, without nail; scales on its 

 front transverse, more or less square. 

 cfl. Hind toe without a flap or lobe. . , . Subfamily Anatince; 



EivEB DcoKS (Fig. lY, o), p. 100. 

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

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



Fig. 17. 



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

 , on its front rounded. . . . Subfamily ^»«m«05: Geese, p. 119. 

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



