144 



KEY TO THE WATER BIRDS OF FLORIDA. 



Family LARID.^. Gulls and Terns. 

 Subfamily LARIN^. Gulls. 



Larus argentatus smithsonianus. 



Larus atricilla. 



Length, 21); Wing, 18; Tail, 8; liill, 2.40. 



Length, 24; Wing, 17.50 Tail, 7.50; l'>ill, 2.10. 



Length, 18.40; Wing, 14; Tail, 6 ; Bill, about 1.65. 

 In summer, bill yellowish banded with black ; 



in winter, tipped with dark brown. 



Larus marinus. 

 Great Black=backed Quit. 



See page 191 



Larus argentatus smithsoni- 

 anus. 

 American Herring Gull. 



See page 192 



Larus delawarensis. 

 Ring=billed Gull. See page 192 



Length, 16.50; Wing, 12.50; Tail, 5 : Bill, about 1.75. 

 Adult — head and throat plumbeous in summer, 

 whitish in winter; bill reddish. 



Larus atricilla. 

 Laughing Gull. 



See page 193 



Length, 13.50; Wing, 10.40; Tail, 4.15 ; Bill, 

 1.30. Adult in summer, — bill black; head and 

 neck plumbeous ; feet orange red ; in winter, bill 

 black ; head and neck white ; feet Hesh color. 



Larus Philadelphia. 

 Bonaparte's Gull. See page 193 



