Cimex calcaratus Linnaeus, 1758: 450. STS: Europe; LSUK.
Lygaeus tibialis Fabricius, 1798: 541 (syn. Stål, 1868a: 65). ST(S): India; ZMUC (1 ST).
Alydus hirsutus Kolenati, 1845: 64 (syn. Puton, 1875a: 17). LT (Kerzhner, 2003b: 94): male, Caucasus; NHMW.
Alydus atratus Motschulsky, 1860a: 502 (syn. Jakovlev, 1876d: 256, suspected; Reuter, 1884e: 132). LT (Kerzhner & Jansson, 1985: 41): sex unknown, Russia (FE), Amur; ZMUM.
Alydus pluto Uhler, 1872: 401 (syn. Schaefer & Schaffner, 1994: 315). LT (Schaefer & Schaffner, 1994: 315): male, USA, Colorado; USNM.
Alydus calcaratus var. ater Jakovlev, 1876d: 256. ST(S): Russia (ES), Krasnoyarsk; ZMAS.