Species of the genus Microchelonus Szepligeti, 1908 with very small apical metasomal aperture in males (Hymenoptera: Braconidae: Cheloninae)

Four Palearctic species of the genus Microchelonus Szepligeti, 1908 with very small apical metasomal aperture in males are reviewed. Both the male and the female of Microchelonus minifossa Tobias, 1986 and M. luzhetzkji (Tobias, 1966) are redescribed. Males of two species (females unknown), M. vickae sp. nov. and M. gracitis sp. nov., are described from Central Europe (Czech Republic).