Michaelus

Abstract: . The taxonomy of four relatively common Neotropical eumaeine hairstreak species has been confused. Newly described are Iaspis andersoni Robbins, new species, differentiated from I. talayra (Hewitson), I. castitas (Druce), and I. exiguus (Druce); Michaelus joseph Robbins, new species, differentiated from M. ira (Hewitson); and Ignata caldas Robbins, new species, differentiated from I. gadira (Hewitson). Iaspis andersoni is unnamed because of a taxonomic misidentification made more than a century ago. The latter two are undescribed because the types of M. ira and I. gadira are not the species that they had been thought to be. Populations in the Arawacus togarna (Hewitson) species complex from Mexico and Costa Rica have been treated as two distinct species, but new data on geographical variation of wing pattern and male genitalia suggests that this classification is incorrect. A lectotype for Thecla exiguus Druce, 1907 is designated because taxonomy of the Iaspis talayra group in the Amazon Region i...