A new species of Atrytonopsis is described from southwestern Jalisco, Mexico. Based on wing phenotype and morphology of the male genitalia, the new species appears closest to A. cestus, a taxon known from southern Arizona, United States, to central Sonora, Mexico. Notes on the circumstances behind the collection and discovery of this new species are provided, as well as a detailed comparison of the new species to other Atrytonopsis taxa.
