The eriophyid mites, Dicruvasates tamaricis n. gen., n. sp., and Eriophyes dioicae K. recorded for the first time in Egypt, have been collected from Tamarix nilotica (Ehrenb.). The first species was found under the scale-like leaves, wandering along the twigs, while the latter makes small bud galls. Combined infestation of both species may cause rusting to the scale-like leaves and malformation of the succulent twigs. Relationships of the new genus and species are discussed.