Résumé
Eucharitidae (Hymenoptera: Chalcidoidea) are specialised parasitoids of the immature stages of ants (Hymenoptera: Formicidae). Nine species of eucharitids were known to occur in Iran. Our recent sampling in north-western Iran revealed the presence of an additional species, E. (E.) arasbaranensis Lotfalizadeh and Rasplus, sp. n. We also sampled and redescribed Eucharis (Eucharis) diaphana Gussakovskij, a species previously known only from Russia and Turkmenistan. We provide detailed illustrations and diagnoses for these species as well as an identification key to the Iranian species of Eucharitidae.