Bat ticks of the genus Argas (Ixodoidea, Argasidae). 2. Secretargas new subgenus and A. transgariepinus White, 1846, its adult and immature stages; with a definition of the subgenus Argas. Annals of the Entomological Society of America, 50 1957: 544-549. [Zoological Record Volume 94]