A review of the genus Ithomisa Oberthür, 1881 is presented, recognising five species, including a new species, Ithomisa caparao sp. nov., from Minas Gerais, southeastern Brazil. A neotype is designated for Ithomisa umbrata Oiticica-Filho, 1958, and updated distributional and morphological data are provided for all species. The study highlights the taxonomic difficulties within the genus resulting from low interspecific variation and limited material, while reinforcing the underestimated diversity of Neotropical Hemileucinae and the importance of continued surveys in the Atlantic Forest biome.
Mielke et al. (Wed,) studied this question.