KEY TO THE WATER BIRDS OF FLORIDA, 145 
SuBFAMILY STERNINAS. Terns. 
Sterna maxima. Sterna fuliginosa. 
Length, 21; Wing, 16; Tail, 6.10: Tarsus, 1.80 ; 
Bill, 3. Bill deep red; primaries dark slate 
color on inner webs. Sterna tschegrava. 
Caspian Tern. See page 194 
Length, 19; Wing, 14; Tail, 7.10; Bill, 2.40. Bill 
orange or yellow; back pearl gray; under parts 
white. Sterna maxima. 
Royal Tern. See page 195 
Length, 17; Wing, 11.50; Tail, 7.20; Bill, 1.70. Bill 
black; back and upper parts brownish black ; 
under parts white. Sterna fuliginosa. 
Sooty Tern. See page 198 
Length, 15.50; Wing, 10.50; Tail, 5.60; Bill, 2.10. 
Bill black tipped with yellow ; back pearl gray; 
under parts white. Sterna sandvicensis acuflavida. 
Cabot’s Tern. See page 195 
Length, 15; Wing, 10.30; Tail, 5.50; Bill, 1.45; Tar- 
sus, .70 to So. Adult in summer— Bill red tipped 
with black; feet red ; under parts ashy. Adult 
in winter — under parts white ; bill brownish black, 
‘Outer web of outer tail feather darker than 
inner web at all seasons. Sterna hirundo. 
Common Tern. See page 196 
