KEY TO THE WATER BIRDS OF FLORIDA. 



Length, 14; Wing', 12; Tail, 5.50; Bill. 1.40; Tar- 

 sus, 1.30. Forehead not white; crown, includ- 

 ing forehead, black; upper parts pearl gray ; under 

 parts white ; biH comparatively short and thick; 



bill and feet l)lack. 



Gelochelidon niiotica. 



Gulhbilled Tern. See page 62 



Length, 9.50 ; Wing, 8.30; Tail, 3.60; Bill, i.io; 

 Tarsus. .70. Adult in summer — under parts black. 

 Adult in winter — under parts white; bill black; 

 feet dusky brown. 



Length, 0.25 ; Wing, 7; Tail, 3.50 ; Bill, 1.20; Tar- 

 sus, .65. Under parts white ; bill and feet yellow. 



Hydrochelidon 

 mensis. 

 Black Tern. 



nigra surina= 



See page 67 



Sterna antillarum. 



Least Tern. See page 65 



Family RHYNCIIOPIDyE. Skimmers. 



Rhynchops nigra. 



Length, 18 to 20; Wing, 15 ; Tail, 5.50; Bill (cul- 

 men), 2.70; Gonys, 4.25. Bill thin, knife^like, 



tower mandible the longer, basal half of bill 

 vermilion red, blackish at tip. General plumage 

 black, white beneath. 



Rhynchops nigra. 

 Black Skimmer. 



See page 6S 



