Redescriptions are provided of the Palaearctic species of Thaumastoptera (s. str.) Mik, viz. T. (T.) calceata Mik, 1866 (Europe; Saudi Arabia), T. (T.) intermixta Savchenko, 1974 (Russia: North Caucasus; Georgia), and T. (T.) insignis Lackschewitz, 1940 (Portugal, Spain), and a new species, T. (T.) spathifera sp. n. (Italy: Sicily), is described. All important characters of the wing and the male terminalia are illustrated. A key to the Palaearctic Thaumastoptera (s. str.) is appended.
Keywords: Diptera, redescriptions, new species, distributions, key.