Riparia Forster, Syn. Cat. Brit. B., p. 17 (1817). Type, Riparia riparia Linn.
In the genus Riparia the tarsi are bare or merely have a single small tuft of feathers on the posterior edge ; the tail is forked in varying degree but never to any great extent: the plumage is pale and dull and the tail-feathers are never spotted with white as in the next genus.
The breeding areas of the various forms of R. riparia and of R. paludicola overlap and they must therefore be treated as ecies.
Key to Species.
A. A tuft of feathers behind xhe tarsus ; a well-defined collar across the breast…………R. riparia, p. 281,
B. Tarsus quite bare; collar across breast obsolete or absent…………R. paludicola, p. 234-.