﻿AbstractQuasigraptocleptesmaracristinaegen. nov.,sp. nov.(Hemiptera,Heteroptera,Reduviidae,Harpactorinae,Harpactorini) is described based on male and female specimens from Brazil. Photographs and comments about the syntypes ofMyocorisnigricepsBurmeister, 1835,MyocorisnugaxStål, 1872,MyocoristipuliformisBurmeister, 1838 andXystonyttusichneumoneus(Fabricius, 1803) are presented. The intra-specific variability and sexual dimorphic characteristics among specimens ofQ.maracristinaesp. nov.are recorded. General characteristics ofHiranetisSpinola, 1837,GraptocleptesStål, 1866,Quasigraptocleptesgen. nov.andParahiranetisGil-Santana, 2015, which seem to be closer genera, are compared, including those of the male genitalia of some species. A key to the species ofMyocorisBurmeister, 1835, and an updated key to Neotropical wasp-mimickingHarpactorinigenera are provided.