Mesene Doubleday (Lepidoptera: Riodinidae) from Parque Nacional da Serra do Divisor, Acre, Brazil, with taxonomic notes and the description of a new species Dolibaina, Diego Rodrigo Dias, Fernando Maia Silva Siewert, Ricardo Russo Mielke, Olaf Hermann Hendrik Casagrande, Mirna Martins Zootaxa 2016 4175 5 463 472 Bates, 1868 Bates 1868 [151,504,1077,1103] Insecta Lycaenidae Mesene Animalia Lepidoptera 6 469 Arthropoda species eupteryx   A single female was collected in 2014 flying on the hilltop three meters from the ground around 16:00h. Themale illustrated in the figures 9–10 is from Reserva Catuaba, Senador Guiomard, Acre, Brazil, 700 Kmsoutheast from PNSD.    Mesene eupteryx, originally described as a species, was placed by Stichel (1923)as a subspecies of  M. nolaHerrich-Schäffer, [1853] ( Figs 13–14). Specimens deposited at the DZUPrevealed these two taxa in sympatry in Ilhade Maracá, Alto Alegre, Roraima, Brazil. The male genitalia of  M. nola( Fig. 37) differs from that of  M. eupteryx( Fig. 36) by the shorter proximal area of the valva, by the valva distally pointed instead of rounded, and the absence of a short and narrow projection in the inner surface of the valva. Based on these differences we recognize  M. eupteryx stat. rest.as a valid species.   Taxonomic comments on  M. nolaand related species.The examination of  M. nolaand other taxa during the taxonomic assessment of  M. eupteryxprovided support for some further taxonomic changes. Hall & Harvey (2002)cited the additional patch of CASin the tergite 7 observed in  M. margaretta(White, 1843)as unique among the species of  Mesene. The study of the abdomen of  M. eupteryxand  M. nolarevealed the presence of the typical  Mesenedistribution of CASin  M. eupteryx( i.e. CASin tergites 4, 5, and 6), however, an additional patch of CASin the tergite 7 was observed in  M. nola. In additional dissections of specimens of  Meseneavailable at the DZUP, an additional patch of CASin the tergite 7 was also observed in  M. philonisHewitson, 1874, a species placed in the “  phareus” species group by Hall & Harvey (2002). Those authors probably mistook the identity of  M. philoniswith an undescribed taxon with similar wing pattern, but with the genitalia and CASpattern typical of members of the “  phareus” species group (Dolibaina & Dias, pers. obs.). Disregarding  M. philonis, a species widely distributed from the Amazonbasin to eastern Brazil, Jauffret& Jauffretdescribed  M. lecointrei Jauffret & Jauffret, 2008from Pará,  Brazil. The distribution, wing pattern and morphology of the male genitalia of  M. lecointreiand  M. philonisare identical, and therefore we recognize  M. lecointreias a junior subjective synonym of  M. philonis( syn. nov.). Nevertheless, Jauffret & Jauffret (2008)recognized the similarity between the male genitalia of  M. lecointrei( i.e.,  M. philonis) and  M. nola, suggesting a close relationship between those species. The morphology of the male genitalia of  M. margaretta( Hall & Lamas 2007, fig. 7),  M. nola( Fig. 37) and  M. philonis,with an entire triangular valva, distally narrow, long and pointed, with a slightly upturned tip, projecting over the aedeagus; the presence of two groups of robust spine-like cornuti, one of which divided in two subgroups, with a small patch of tiny spines in the middle; and the presence of an additional patch of CASin tergite 7 indicates that these species are closely related, belonging in the same species group. Incontrast, further studies are necessary to access the phylogenetic affinities of  M. eupteryx. 1323867421 PNSD Brazil Km The Senador Guiomard 6 469 1 Acre 1323867422 DZUP Iceland Alto Alegre 6 469 1 Roraima 1323867420 CAS, DZUP Brazil Disregarding Jauffret Amazon 6 469 1 Para 1323867426 CAS Brazil 7 470 In 6 469 1