CONTEXTS. 



Geitcs III. Hybbochelidon. Marsh-Tern - 657 



1. Hydrochelidon nigra. The Black Marsh-Tern - 658 



2. Hydrochelidon leucoptera. The White-winged 



Marsh-Tern - - - 661 



3. Hydrochelidon leucopareia. The Whiskered Marsh- 



Tern - - - - 668 



Genus IV. Gelochelidon. Gcll-billed Teen - 665 



1 . Gelochelidon anglica. The Marsh Gull-billed Tern 666 



Gentts V. Megaxopterus. Noddy - - 670 



1. Megalopterus stolidus. The Foolish Noddy 672 



