KEY TO FAMILIES. 



WATER BIRDS. 



21 



GROUP 5. 



Toes, three, full webbed ; no hind toe. 



Nostrils, separate, uot opening into one double-barrelled tube ; upper mandible, curved 

 near tip; bill, yellowish, or greenish yellow; an indication of a hind toe, iu tlie form of a 

 jf^., small knob without nail ; tail, entirely white, or 



white with black band near tip. This is the only 

 North American gidl lacking a hind toe. 

 ^' Family LARID/E (Larus tridarjijla). 



'^ Kittiwalte Gull. 



See page .SO. 



Bill, reddish (in life showing also yellow and lilue), 

 peculiar in form, suggesting that of parrot. 

 Family ALCID/E. 

 Subfamily FRATERCULIN/E. Puffins. 



See page 80. 



Bill, black, with narrow white band. 

 Family ALCID/E. 

 Subfamily ALCIN/E. Aulcs. 



See page .SO. 



Bill, black or l)rownish ; wing, 

 over 7.2.5 incites long, carpus (liend 

 of wing) to tip. 



Family ALCID.*. 

 Subfamily ALCIN/E. 

 Murres. 

 ■^si^^ See page 30. 



S^alW 



Bill, black, or blackish; wing, less than 7.25, but more than .5. .50, measured, carpus to tip. 

 Family ALCID/E. Subfamily PHALARIN/E. Guillemots. 



See page ,30. 



