Title Two new eriophyid species (Acari: Eriophyoidea) from Meshginshahr rangelands, Iran Type of Research Article Keywords Aceria, Aculus, Ardabil, Compositae, Fabaceae Abstract During the survey on eriophyoid mite fauna of Meshginshahr rangelands two new eriophyid species were found and described: Aceria onopordi Lotfollahi et Hemmatzadeh sp. nov. from the host plant Onopordum acanthium L. (Asteraceae) and Aculus astracti Lotfollahi et Hemmatzadeh sp. nov. from the host plant Astragalus compactus Lam. (Fabaceae). Both species were vagrant on their host plant without any observed alteration on them. Researchers (First Researcher)، Parisa Lotfollahi (Second Researcher)، Ali Mehrvar (Third Researcher)، Enrico de Lillo (Fourth Researcher)