Pachymerus pusillus Scholtz, 1847: 145. ST(S): Poland, Silesia; lost.
Rhyparochromus coleoptratus R.F. Sahlberg, 1848: 60 (syn. Baerensprung, 1858b: 80). LT (Péricart, 1997a: 68): male, Finland, Helsinki; MZHF.
Plinthisus latus Reuter, 1870: 313, 320. LT (Péricart, 1997a: 66): female (macr.), Finland, Pargas; MZHF.
Plinthisus mellae Ferrari, 1874: 158 (syn. Horváth, 1876b: 726). LT (Péricart, 1998c: 7): female, Italy, Liguria, Legnano; MCSN.