KEY TO THE WATER BIRDS OF FLORIDA. 



H7 



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; bill comparatively short and thick; 



bill and feet black. 



Length, J).i><) : Wing, .S.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. 



Gelochelidon nilotica. 



QuII-billed Tern. See page 194 



Hydrochelidon nigra surina- 

 mensis. 

 Black Tern. See page 199 



Sterna antillarum. 



Least Tern. See page 197 



Family RHYNCHOPID/E. Sklmmers. 



Rhynchops nigra. 



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

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



lower mandible the longer, basal half of l)ill 

 vermilion red, blackish at tip. ( ieneral plumage 

 black, white beneath. 



Rhynchops nigra. 

 Black Skimmer. 



See page 200 



