Abstract In this paper, we treat three species of Neurostigma. For the first, N. roesleriNew, 1980 we provide illustrations of the holotype, a revised diagnosis, the female redescription, including the first description of the spermatheca and a distribution map of the species considering N. garcialdretei Mendivil Nieto, Gonzalez Obando & Carrejo Gironza, 2020 syn. nov. For the second species, N. enderleini New, we redescribe the male, describe and illustrate the unknown female, and provide a revised diagnosis and new records for the Brazilian states of Amapá and Rondônia. For the third species, N. xanthopterumNew, 1980, we include the first description and illustration of the spermatheca. paper Neurostigma N roesleriNew 198 holotype redescription Nieto Gironza 202 syn nov New male Rondônia xanthopterumNew 19 20 1 2

Abstract The holotype of the Neurostigma xanthopterumNew, 1980 is here illustrated based on photographs. We also describe and illustrate a previously unknown female individual that is assigned to this species. New records for five localities in the Brazilian state of Amazonas, one in the Brazilian state of Acre and another in the Brazilian state of Amapá, are presented. The mouthparts of both sexes are here describe and illustrate. Thirteen types of variation and anomalies in the fore-hindwing veins were found. We found unique patterns in the number and shape of transverse veins in the pterostigma between individuals. We also identified a large variation in the denticles present in the lacinia. Therefore, we suggest these variable characteristics (fore-hindwing veins and lacinia denticles) are not to be used for the diagnosis of species of this genus. A revised diagnosis of N. Xanthopterum is also presented.