146 KEY TO THE WA'TER BIRDS OF FLORIDA. 
Sterna dougalli. 
Length, 15; Wing, 10.25; Tail, 6.60; Bill, i.50; Tar- 
sus, .go. Adult in summer — bill dull orange red 
tipped with black; feet orange red; under parts 
white. Adult in winter—bill dark brown; feet 
brown; a dusky black patch on sides of the 
head inclosing eye; inner web of outer tail 
feather darker than outer web inall plumages. 
Length, 15; Wing, 7.75; Tail,7.50; Bill,1.55; Tarsus, 
85. Bill black, showing tinge of red atthe base ; 
tail white; whole of outer tail feather white ; 
under parts white tinged with rose color; feet 
red. 
Length, 15; Wing, 10.30; Tail, 6; Bill, 1.60. Entire 
plumage olive brown; top of head whitish. 
Immature birds have the top of the head brownish. 
Length, 14.50; Wing, 10; Tail, 6; Bill, 1.60. 
Crown black ; forehead and line extending over 
the eye white; mantle gray; under parts white ; 
bill and feet black. 
Sterna forsteri. 
Forster’s Tern. 
Sterna dougalli. 
Roseate Tern. 
Anous stolidus. 
Noddy Tern. 
Sterna anzthetus. 
Bridled Tern. 
See page 196 
See page 197 
See page 199 
See page 198 
