Transferred to Isognathus by Butler, 1876, Trans. zool. Soc. Lond.9: 630. Erroneously synonymized with Isognathus rimosus [sic] by Hodges, 1971, in Dominick et al.Moths Amer. N. of Mexico21: 96. Reinstated as a species by Bridges, 1993, Cat. Fam. Gen. Spec. Sphingidae of the World: VIII.12. Erroneously treated as a subspecies of Isognathus rimosus [sic] by Carcasson & Heppner, 1996, Atlas Neotrop. Lepid.4B: 54. Reinstated as a species by Kitching & Cadiou, 2000, Hawkmoths of the world: 51.