The monotypic mimallonine genus Tostallo St Laurent and C. Mielke is reviewed in order to provide a more comprehensive understanding of the distribution of T. albescens (Jones). Biological information, including larval case structure and phenological data, are provided for this enigmatic species, along with the first photograph of a living example of T. albescens. Mimallodes gen. n., is described for the single species M. anaemicus sp. n., based on a single male collected in Espírito Santo, Brazil. The genera Tostallo and Mimallodes are apparently closely related based on similarities in male genitalia and forewing maculation.