Rhyparochromus chiragra var. emarginatus Rey, 1888a: 101 (upgraded by Josifov, 1961d: 117). LT (Péricart, 1996c: 108): female, France, Rhône; MHNL.
Megalonotus chiragra f. maxima (non Puton & Noualhier, 1895): Lindberg, 1948b: 71. Misidentification (see Linnavuori, 1953b: 163).
Megalonotus chiragra cyprius Linnavuori, 1954: 163 (as subsp. of emarginatus by Seidenstücker, 1979: 278; syn. Péricart, 1999c: 137). LT (Seidenstücker, 1979: 278): female, Cyprus, Boghazi; MZHF.
Megalonotus emarginatus f. atricornis Roubal, 1965b: 559, 574. STS: France, Germany, Italy; SNMC?