Agradecimentos: The authors thank Cristalino Lodge and Fundação Ecológica Cristalino for logistic support. Keith Willmott carefully read the last version of the manuscript and gave valuable suggestions. The ICMBio provided the collecting permits (10438-1, 7462-1, 8969-1). AVLF acknowledges support from FAPESP (Biota-Fapesp grants 2011/50225-3 and 2013/50297-0), from the Brazilian Research Council – CNPq (fellowship 303834/2015-3), from the National Science Foundation (DEB-1256742) and from USAID and the U.S. National Academy of Sciences (NAS) under the PEER program (Sponsor Grant Award Number: AID-OAA-A-11-00012). EPB and TZ thank FAPESP for Pos-Doc fellowships (2016/15873-8, 2017/02264-6, respectively). LLM thanks CAPES for a doctoral fellowship. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. This publication is part of the RedeLep ‘Rede Nacional de Pesquisa e Conservação de Lepidópteros’ SISBIOTA-Brasil/CNPq (563332/2010-7). Butterfly species are registered in the SISGEN (ACBC599) Ver menos

Abstract: A new genus and species of Euptychiina (Satyrinae), Cristalinaia vitoria Mota, Zacca & Freitas gen. et sp. nov., is described based on three specimens collected in the region of the Cristalino River, Alta Floresta, Mato Grosso, Brazil. This rare species is known only from this region, where it flies inside the dense bamboo patches typical of that area. The last instar larva and the pupa are described; the larva was observed feeding on mature leaves of the common bamboo Guadua aff. paniculata Munro Ver menos