Corticeus bicolor

Corticeus (s. str.) bicolor (Olivier, 1790) Köhler 2012: 89, 125; 2013: 102. Note. This detriticolous species, associated with elms, is widespread across all adjacent regions (Géhin 1846; Fournel & Géhin 1847; Köhler & Klausnitzer 1998; Soldati 2007; Thomaes et al. 2025). It is scarce and localized in the Guttland and Saarland, where it is considered endangered (Lillig 1999), but appears to be widespread in the Netherlands (Everts 1903) and very abundant in Belgium (Libbrecht 1988). Formerly quite common in Lorraine (Godron 1863), it is now rare and localized as a consequence of the decline of elm trees (F. Soldati in litt.).