Abstract
<jats:p>The publication deals with 228 species of Nepticulidae (or pygmy moths) from the Neotropics (i.e., the Neotropical and Ando-Patagonian regions) and adjacent areas. The species are illustrated with photographs or drawings of adult forewings, the male genitalia and, if available, leaf mines. In addition to the illustrated species review, the monograph announces about the launching of the first electronic diagnostic system (a free electronic tool on the internet) designed for the identification of species of Nepticulidae and includes chapters on the global biodiversity inventory, the collecting of adults and larvae of pygmy moths, preparation of micro-mounts of genitalia structures of Nepticulidae, global generic composition of the family, some particularities of Nepticulidae biology, a unique morphology guide based on the forewing pattern and male genitalia, descriptions of four newly named species, and a taxonomic checklist of the species currently known from the Neotropics and adjacent areas.</jats:p>