EN
The genus Semissus Melichar, 1906 is redescribed. Theryana Bergevin, 1922 is placed in synonymy with Semissus. Semissus acuminatus (Lethierry, 1876) and S. semissoides (Bergevin, 1922), comb. nov. are redescribed. S. tlemsenicus Dlabola, 1987 is placed in synonymy with S. acuminatus. Three new species of the genus are described from Morocco and Algeria - S. pliadicus sp. nov., S. hyadicus sp. nov., and S. hesperidicus sp. nov. A key for species identification is given.