Lethocerus Mayr, 1853: 17 (conserved by ICZN Opinion 1248/1983). Type species by monotypy: Lethocerus cordofanus Mayr, 1853 (= Belostoma fakir Gistel, 1848).
Belostoma (non Latreille 1807): Latreille, 1809: 384. Misidentification.
Iliastus Gistel, 1848: 149 (suppressed by ICZN Opinion 1248/1983). Type species by monotypy: Nepa grandis Linnaeus, 1758, S America.
Amorgius Stål, 1866a: 179 (syn. Torre Bueno, 1908: 237). Type species by subsequent designation (Stål, 1866b: 168): Belostoma collosicum Stål, 1854, Mesoamerica.
Montandonista Kirkaldy, 1901a: 6 (as subgenus of Belostoma auctt., non Latreille, 1807; syn. implied by Torre Bueno, 1908: 237; confirmed by Lauck & Menke, 1961: 647). Type species by subsequent designation (Kirkaldy, 1906a: 151): Belostoma grande var. americanum Leidy, 1847 (= Lethocerus americanus), N America.