Hanieh Taher - Entomological Department, Agricultural Faculty, Arak Branch, Islamic Azad University, Arak, Iran.
Reza Vafaei Shoushtari - Entomological Department, Agricultural Faculty, Arak Branch, Islamic Azad University, Arak, Iran.
Hossein Lotfalizadeh - Plant Protection Research Department, East Azarbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran.
Shila Goldasteh - Entomological Department, Agricultural Faculty, Arak Branch, Islamic Azad University, Arak, Iran.

Prior to this study eight species of Mesopolobus Westwood were recognized from Iran. In this study, one species namely M. aspilus (Walker) is newly recorded. An illustration of the external features of this species is provided. All known species from Iran were reviewed, the key to species and their geographical distribution in Iran is provided.

Pteromalidae, soil and litter, Chalcidoidea, parasitoid, Iran