KEY TO FAMILIES. WATER BIRDS. 



21 



.:-, 



GROUP 5. 

 Toes, three, full webbed ; no hind toe. 



Xostrils, separate, not opening into one double-barrelled tube ; upper mandible, curved 

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

 ,--v -, small knob without nail; tail, entirely white, or 



white with black band near tip. This is the only 

 North American gull lacking a hind toe. 



Family LARID/C (Lams tridactyla}. 

 Kittiwake Gull. 

 See page 36. 



Bill, reddish (in life showing also yellow aud blue), 

 peculiar in form, suggesting that of parrot. 

 Family ALCID/E. 

 Subfamily FRATERCULIN/B. Puffins. 



See page 30. 



Bill, black, with narrow white band. 

 Family ALCID/C. 

 Subfamily ALCIN/E. Auks. 



See page 30. 



Bill, black or brownish; wing, 

 over 7.25 inches long, carpus (bend 

 of wing) to tip. 



Family ALCID/E. 

 Subfamily ALCIN/C. 

 Murres. 



Hi Si ' i i:i - 3 - 



Bill, black, or blackish; wing, less than 7.25, but more than 5.50, measured, carpus to tip. 

 Family ALC1D/E. Subfamily PHALARIN/E. Guillemots. 



See page 30. 



