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Superfamily Chalcidoidea is one of the most important and richest groups of Hymenoptera. Chalcids are often small and shiny insects. They immediately can be recognized by a reduced wing venation. Maximum four longitudinal veins are present in front wings (Fig. 6.1). Venation of platygastrids may resembles this general pattern, but chalcids may easily be recognized by quadrate pronotum in lateral view and a distinct distance between tegula and pronotum which sometimes filled by a sclerit namely prepectus or post-spiracular sclerit (Fig. 6.1). Some minute specimens like members of Trichogrammatidae and Aphelinidae are without metallic coloration and metasoma fused to mesosoma by a thorough contact. Chalcids are sometimes very strange in appearance.