Mirax caspiana sp. nov. from Iran is described and illustrated. The new species is characterized by having the second metasomal tergite aciculate, the width of face 1.2 times longer than height of face and clypeus combined, the penultimate flagellomere twice as long as wide and the malar space as long as basal width of mandible. A key to the species of the genus Mirax Haliday in the West Palaearctic Region is provided.