Two new vagrant species of eriophyoid mites, Brevulacus cornifrontissp. nov. and Cecidophyes aliabadisp. nov., living on the under surface of the leaves of Quercus castaneifolia (Fagaceae) in Iran are described and illustrated. It is also the first record of a species belonging to the genus Cecidophyes found in Iran. Keys to the World Brevulacus and Quercus-related Cecidophyes species are provided. As a consequence of species comparison, Rhyncaphytoptus dichromae was assigned to Brevulacus.