| abstract | A new eriophyoid mite species, Heterotergum zaheri sp. nov. from Ziziphus spina-christi (L.) Desf (Rhamnaceae) is described and illustrated. This mite is vagrant in the tender apical shoots (between hairs) and on the lower surface of young leaves. It causes no apparent damage. In addition, a supplementary description of Vittacus bougainvilleae (Keifer, 1959) comb. nov. (transferred from Phyllocoptes), is provided; it is recorded for the first time in Egypt, infesting Bougainvillea glabra Choisy (Nyctaginaceae). Moreover, Aculops guajavae Abou-Awad, Al-Azzazy & Afia, 2016, which causes rust on terminal leaves of Psidium guajava L. (Myrtaceae), is set as a junior synonym of Tegolophus guavae (Boczek, 1960) and redescribed. |