A study on the stigmaeid and pseudocheylid mite fauna in northwestern provinces of Iran was carried out during 2012–2014. In this survey, 24 and 4 species of Stigmaeidae (belonging to 7 genera) and Pseudocheylidae (belonging to 1 genus) were collected and identified, respectively. In this paper, the male of Mediolata belfieldi Momen, 1987 is described and the female is re-described.
