Holotrichius obtusangulus Stål, 1874b: 77. ST(S): female, Greece; NHRS.
Reduvius variegatus Reuter, 1880a: 12 (syn Reuter, 1891e: 16). HT: male, Greece, Attica; MZHF (Jansson & Coscarón, 1989: 12).
Holotrichius obtusangulus var. brachymerus Reuter, 1891e: 17. STS: 2 males , Greece, Naxos Is. and Morea; MZHF, NHMW (Jansson & Coscarón, 1989: 5).
Holotrichius obtusangulus var. tauricus Reuter, 1891e: 17. STS: males, Ukraine, Crimea ("Tauria"); NHMW.