(Apodidae; Ϯ Alpine Swift T. melba) Gr. ταχυς takhus fast; μαρπτις marptis seizer < μαρπτω marptō to seize; "The generic name of Apus is rejected by Oberholser  owing to the earlier use of the name of Apos, the name of Micropus being used instead. This genus contains too many widely different groups to be considered a natural genus as it now stands. I would therefore classify them as follows: 1. Size very large, wing well over 7½ inches in length; abdomen white, rump not white: Tachymarptis gen. nov., type Hirundo melba L. Size smaller, wing under 7½ inches in length; abdomen not white: 2. 2. Rump white: 3." (A. Roberts 1922) (see Caffrapus, Epicypselus and Colletoptera).