Hurtado & D'Elía (2019, Journal of Zoological Systematics and Evolutionary Research, 57, 127) assessed the taxonomy and systematics of Oligoryzomys destructor (von Tschudi, 1844), including the evaluation of names associated with this species. These authors recognized O. destructor as polytypic, with O. destructor destructor and O. destructor spodiurus (Hershkovitz, 1940) as subspecies; additionally, the epithet melanostoma von Tschudi, 1844 was treated as a junior synonym of O. d. destructor. They also stated that in the original description of Hesperomys destructor and Hesperomys melanostoma, no holotypes or type localities for either species were designated. For this reason, Hurtado & D'Elía erected neotypes for both of von Tschudi's nominal species. Nonetheless, the type material collected and used by von Tschudi to describe H. destructor and H. melanostoma is still extant and held at the Muséum D'Histoire Naturelle de Neuchâtel (Neuchâtel—Switzerland), along with other mammals collected by him. Furthermore, I provide some comments on the original collection locality for both type specimens, presenting further evidence on the resolution of this problem. The existence of this original material invalidates the neotypes proposed by Hurtado & D'Elía and, consequently, their redesignated type localities, highlighting the importance of carrying out exhaustive searches before the designation of new type material.