Three species of Monhystrella Cobb, 1918 are recorded from inland waters in South West Africa-Namibia, constituting the first record of these species from southern Africa. Detailed descriptions and figures are provided for the three species, viz. M. lepidura (Andrassy, 1963), M. parvella (Filipjev, 1931) and M. paramacrura (Mcyl, 1954). A new subspecies is proposed for the southern African population of M. lepidura. M. lepidura seelyae n. subsp. is more slender than M. lepidura lepidura (from Argentina) and M. lepidura altherri (from Switzerland and Ghana), and there is no distinct basal bulb as in the other two subspecies. The two subspecies of M. parvella, proposed by Jacobs (1987c) are not recognized.