Despite their importance as potential biological control agents, species of the campoplegine
genus Campoplex Gravenhorst, 1829 are hard to identify. Previous works provided short descriptions
or poor illustrations of crucial characters, meaning it is often impossible to distinguish closely related
species. We provide illustrations to identify species of the Campoplex difformis group and redescriptions
of and illustrations for C. difformis (Gmelin, 1790), C. capitator Aubert, 1960, C. dubitator Horstmann,
1985, C. formosanae Horstmann, 2012, and C. unicingulatus (Schmiedeknecht, 1909). In addition,
the taxonomic status of C. difformis is clarified; a lectotype is designated for C. capitator in Aubert’s
collection in Lausanne and the host record for this species on Ancylis mitterbacheriana (Denis &
Schiffermüller, 1775) is queried; Campoplex corsicator Aubert, 1960 stat. nov. is removed from
synonymy with Campoplex tibialis (Szépligeti, 1916) and redescribed