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The species of the genus Spathius Nees without the first radiomedial vein in the forewing and the status of the subgenera Antespathius Belokobylskij and Ambispathius Belokobylskij of this genus are discussed. Six new species from the species groups S. antennalis Szépligeti and S. rusticulus Wilkinson and the subgenus Ambispathius Belokobylskij from Vietnam are described and illustrated: S. alahamatus, n. sp., S. maichauensisn, n. sp., S. pacoensis, n. sp., S. sterlingi, n. sp., S. subanervus, n. sp., and S. tramlapus, n. sp. A key to Spathius species characterized by reduction of the first radiomedial vein in the forewing is provided.