Euptychia boulleti (Le Cerf) n. comb. (Lepidoptera: Nymphalidae: Satyrinae), a rare and endangered butterfly from Southeastern Brazil.

This paper discusses the systematic position of the rare and endangered satyrine butterfly Caenoptychia boulleti Le Cerf, the only included species in Caenoptychia (type species), based on adult morphology and molecular data. The results showed that Caenoptychia Le Cerf belongs to the Euptychia Hübner clade, and the genus is synonymized with Euptychia, new synonymy. Euptychia boulleti (Le Cerf) is a new combination. The male genitalia of E. boulleti showed at least one important synapomorphy with the other species of Euptychia, which is the presence of a posterior projection of the tegumen above the uncus. Molecular data reinforces the position of Caenoptychia within the genus Euptychia.