A new genus, Lubomirus gen. nov., of the family Ismaridae (Hymenoptera, Diaprioidea) from the late Eocene Baltic and Rovno ambers is described and illustrated. The new genus is the second known genus of the family Ismaridae. The two new species, Lubomirus masneri sp. nov. from Rovno amber and Lubomirus victori sp. nov. from Baltic amber, are described. The diagnosis of the Ismaridae family and the single extant genus of the familyIsmarus Halidayare clarified. The systematic position of Cretapria Fujiyama, 1994 is discussed.