Mecostethus grossus: Miram, 1931: 44; Miram, 1933: 34; Mistshenko, 1971: 581; Matis & Glushkova, 1973: 121; Matis et al., 1977: 134; Matis et al., 1977: 136.
Stethophyma grossum: Ryabukhin & Zasypkina, 2005: 307; Ermakova, 2011: 21; Haberski et al., 2021: 43.
Stethophyma lineatum (partim): Vickery, 1967: 269; Vickery & Kevan, 1983: 1080; Vickery, 1984: 20; Vickery, 1997: 229.
Remarks. A few specimens of this species have been recorded from Yukon, the Northwest Territories and Alaska as S. lineatum Scudder, 1863 (Vickery & Kevan, 1983). Recently the specimens from Alaska were correctly identified as S. grossum (Haberski et al., 2021). The records of isolated populations of S. lineatum from the extremely North Canada seem to be result of misidentification and belong to S. grossum. In Beringia, this Holarctis species has been recorded from Northeast Yakutia, Magadan region, Alaska, Yukon, and the Northwest Territories. This large and conspicuous grasshopper inhabits wetlands.