During surveys of eriophyoid mites on Mangifera indica L. (Anacardiaceae) in Egypt, a new species, Aceria aegyptindicae sp. nov., was collected and is here described and illustrated. This species was found in colonies as an inquiline, under waxy coatings on both leaf surfaces, usually along the midribs, in association with Cisaberoptus kenyae Keifer, 1966. Neocalacarus mangiferae ChannaBasavanna, 1966 is recorded for the first time from Egypt and a supplementary morphological description and illustrations are given. All stages of C. kenyae are re-described, and information about other eriophyoid mites collected from mango orchards is provided. The population fluctuation of the four eriophyid mites: C. kenyae,A. aegyptindicae sp. nov., N. mangiferae and Vareeboona mangiferae (Keifer, 1946) was studied during the 2020 season in the Egyptian Governorate, Qalyubia on mango orchards “Alphonso" cultivar. Populations of C. kenyae andA. aegyptindicae had three peaks in January, May and November. On the other hand, N. mangiferae had two peaks, in February and August, and V. mangiferae had two peaks in February and November.