(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 [1905] 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).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from www.hbw.com on 16 December 2018).