Terminology, [20] f.

Tern, [82], [268], [300], [301], [310] f.;

habits, [303] f.;

Arctic, [313];

Black, [314];

Caspian, [304], [314];

Common, [313], [313];

Gull-billed, [314];

Least, [304], [311];

Lesser, [311];