Gonocerus insidiator var. imitator Reuter, 1891k: 20 (upgraded by Linnavuori, 1960: 22). STS: Greece, S Sporades, Nikaria; lost. NT (Moulet, 1991b: 49): female, Greece, Morea, Cumani; MZHF.
Plinachtus falcatus Distant, 1892b: 251 (syn. nov.). ST(S): South Africa; BMNH.
Gonocerus carreti Puton, 1895: 84 (syn. Linnavuori, 1960: 22). LT (Moulet, 1991b: 49): male, Algeria, Gouraya; MNHN.
Gonocerus madeirensis China, 1938c: 9 (syn. Moulet, 1991b: 50). HT: male, Madeira; BMNH.
Plinachtus falcatus var. antennalis Schouteden, 1938: 283. HT: male, Congo, Kasenyi; MRAC.
Plinachtus falcatus var. dubiosus Schouteden, 1938: 283. HT: female, Rwanda, Gabiro; MRAC.