Euptychia, a diverse genus of Neotropical satyrine butterflies, has been the subject of taxonomic studies over the past several decades, yet our understanding of its species diversity and the phylogenetic relationships of species has been far from complete. A Monograph of the Genus Euptychia Hübner, 1818 (Lepidoptera, Nymphalidae, Satyrinae) makes significant breakthroughs toward developing a firm species classification of Euptychia . Based on travels around the globe, visits to natural history collections, and years of field work, Shinichi Nakahara, Andrea Schomann, Christer Fåhraeus, and Keith R. Willmott offer new morphological and molecular data, alongside a review of archival records, to produce a comprehensive analysis of what is known about Euptychia today.