Erstbeschreibung:Evans, W. H. (1953): A Catalogue of the American Hesperiidae indicating the classification and nomenclature adopted in the British Museum (Natural History). Part III (Groups E, F, G) Pyrginae. Section 2: i-v, 1-246, pl. 26-53. — Digitalisat auf biodiversitylibrary.org: [187]
Erste Beschreibung des ♀:Siewert, R. R., Mielke, O. H. H. & M. M. Casagrande (2015): Tosta Evans, 1953 (Lepidoptera: Hesperiidae): a new species from northeast Brazil, first description of the female of Tosta tosta Evans, 1953, and placement of the genus within Achlyodini. — Zootaxa 3999 (3): 446–450.