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Yphthimoides inornata (Hayward, 1962) stat. rev., currently regarded as a nomen dubium and synonym of Yphthimoides yphthima (C. Felder & R. Felder, 1867) has its status revalidated based on morphological characters and the DNA barcode. Images of the male and female, including their genitalia, information on the distribution, habitat, and immature stages are provided.

The Neotropical skipper genus Augiades Hübner, [1819] (Lepidoptera: Hesperiidae) is revised. Neotypes are designated for Hesperia vespasius Fabricius, 1793, and Phareas epimethea Plötz, 1883. Lectotypes are designated for Papilio crinisus Cramer, 1780, and Lignyostola crinisus var. bicolor Mabille & Boullet, 1919. Illustrations of adults and male and female genitalia, distribution maps, and an identification keys are provided for all taxa.

A new species belonging to the previously monotypic genus Panca Evans, 1955, P. moseri Dolibaina, CarneiroO. Mielke sp. nov., from grasslands areas of Peru, Bolivia and Brazil is described. Adults and male and female genitalia of the new species are illustrated, described in detail, and compared with the type species of the genus, Lerodea subpunctuli Hayward, 1934, and with its externally most similar and sympatric species, Vidius mictra Evans, 1955. The systematic position of the genus Panca and its association with lowland open natural habitats of South America are discussed.

The species of Argyrogrammana Strand, 1932 collected at the Parque Nacional da Serra do Divisor, Acre, Brazil (PNSD) are listed and detailed with behavioral notes. In total, 17 species were recorded, including 13 new records for Brazil (marked with an asterisk): A. alstonii (Smart, 1979)*, A. nurtia ludibunda BrévignonGallard, 1995*, A. pulchra (Talbot, 1929)*, A. bonita HallWillmott, 1995*, A. amalfreda (Staudinger, [1877])*, A. physis phyton (Stichel, 1911), A. halli DolibainaDias, sp. nov.*, A. celata HallWillmott, 1995*, A. gallardi DolibainaDias, sp. nov.*, A. aparamilla HallWillmott, 1995*, A. praestigiosa (Stichel, 1929), A. johannismarci Brévignon, 1995*, A. brevignoni DolibainaDias, sp. nov.*, A. rameli (Stichel, 1930), A. willmotti DolibainaDias, sp. nov.*, A. iracyi P. JauffretJ. Jauffret, 2007 and A. saulensis tunari Gallard, 2008, comb. nov.*. Four new species are described, two from "amalfreda complex": A. halli DolibainaDias, sp. nov. and A. gallardi DolibainaDias, sp. nov.; one from "trochilia complex": A. brevignoni DolibainaDias, sp. nov.; and one from "stilbe complex": A. willmotti DolibainaDias, sp. nov. Argyrogrammana iracyi saulensis Gallard, 2008 is recognized as a valid species, A. saulensis saulensis, stat. nov., and a new combination is proposed to A. saulensis tunari Gallard, 2008, comb. nov. The females of A. iracyi P. JauffretJ. Jauffret, 2007 and A. saulensis tunari are recognized and figured for the first time. The taxonomy of the species found at the PNSD is discussed and adults are figured, including illustrations of the genitalia.

A new species of Tosta Evans, 1953 from northeast Brazil is described: T. pseudospeculum Siewert, MielkeCasagrande, sp. nov. Additionally, the female of Tosta tosta Evans, 1953, the type species of the genus, is described for the first time. Illustrations of adults and male and female genitalia for all studied species are provided, as well as a discussion of the placement of the genus within the tribe Achlyodini.

A new species from southern Brazil, Stichelia catarinensis sp. nov., is described and lectotypes for Charis dukinfieldia Schaus, 1902 and Phaenochitonia bocchoris suavis Stichel, 1911 are designated. Phaenochitonia bocchoris suavis Stichel, 1911 syn. nov. is considered synonymous with Amarynthis bocchoris Hewitson, 1876. Two species groups are recognized: "cuneifascia" species group, including S. cuneifascia and S. catarinensis sp. nov., and "bocchoris" species group, including S. bocchoris, S. dukinfieldia and S. pelotensis. Additionally, a taxonomic dichotomous key and morphologic illustration for the species of the genus are provided.

The specific status of Euselasia satyroides Lathy, 1926, stat. rev., currently recognized as a synonym of Eurygona modesta Hewitson, 1856, is reinstated, and its immature stages, reared on Pouteria salicifolia (Sapotaceae), are thoroughly described and illustrated. The identity of some species of the genus Euselasia Hübner, [1819] belonging to the "Uriiformes" species group is clarified: lectotypes are designated to Eurygona eugeon Hewitson, 1856, Eurygona modesta Bates, 1868, Euselasia geon Seitz, 1913, and Euselasia satyroides Lathy, 1926, stat. rev.; Euselasia geon Seitz, 1913, syn. rev. is considered a synonym of Eurygona eugeon Hewitson, 1856. Additionally, a taxonomic dichotomous key for the species belonging to the "Uriiformes" group is provided.

The genus Cumbre Evans, 1955 (Hesperiidae: Heperiinae: Moncini) and its respective species are revised. Two new species are described, Cumbre haywardi sp. nov. from Peru and Argentina (type locality) and Cumbre lamasi sp. nov. from Ecuador and Peru (type locality). A lectotype for Phanis cumbre Schaus, 1902 is designated. The examination of the Phanes triumviralis Hayward, 1939 and Phanes belli Hayward, 1939 holotypes indicates that these taxa are new synonyms (n. syn.) of Poanes meridionalis Hayward, 1934, which is a valid species (stat. rev.).

Two new species of Esthemopsis C. FelderR. Felder, 1865 from southeastern and northeastern Brazil are described, Esthemopsis sateri sp. nov. and Esthemopsis diamantina sp. nov., and revised and new combinations are proposed for Esthemopsis teras (Stichel, 1910) stat. rev. and Esthemopsis pallida Lathy, 1932 stat. nov., respectively. Lectotypes are designated for Lepricornis teras Stichel, 1910 and Esthemopsis caerulea pallida Lathy, 1932. The habitus of male and female specimens of the species discussed are illustrated; male head and labial palpus pictures, male and female genitalia illustrations are provided.

A new species of Riodinidae from the grasslands of South Brazil, Paraguay and Argentina, Aricoris schneideri sp. nov., is described.

A new species, Mesenopsis jordana sp. nov., from southeastern Brazilian states of Minas Gerais, Rio de Janeiro, and São Paulo is described and a taxonomic dichotomous key for species of the genus Mesenopsis is provided. Additionally, mimetic models for species of Mesenopsis are suggested and a new distribution record for M. albivitta is provided.