Xylocoris obliquus A. Costa, 1853: 29. ST(S): Italy, Naples; ZIUN?
Piezostethus signatus Jakovlev, 1879: 148 (syn. Horváth, 1897a: 93). LT (Péricart, 1970: 747): male, Russia (ST), Derbent; ZMAS.
Piezostethus obliquus var. orientalis Reuter, 1884c: 42. STS: Iran, S Persia; MCSN?, MZHF.
Xylocoris heluanensis Wagner, 1961d: 301 (syn. Péricart, 1972: 233). HT: male, Egypt, Heluan [= Helwân]; ZMUH.