Hyperacmus crassicornis (Gravenhorst, 1829)

M a t e r i a l. Poland: Podlasie Voivodeship: Biebrza National Park, mineral island Pogorzały, oak-lindenhornbeam forest, MT , 6– 20.07.2008, 1 ♀ (A. Kostro-Ambroziak) (SIZK) .

Diagnosis. The species is characterized by the strongly projecting below antennal sockets head; dorsally absent occipital carina; not strongly twisted mandible, with both teeth visible; propodeum with distinct lateral and lateromedian longitudinal carinae reaching well defined area apicalis; fore wing with vein 3 rs-m absent; short metasomal sternite 1, not reaching the level of spiracles; rugose metasomal tergites 1 contrasting with smooth and glabrous rest of metasoma; short female ovipositor, about 0.4 times as long as the hind tibia length; and tyloids on male flagellomeres 4–5.

Distribution. Holarctic and Oriental regions; Ukraine: Carpathians and Kharkiv Region (Humala, 2003), Poland (Sawoniewicz, 2001).