Introduction: For the fi rst time we provide the description of the melanic (dark) morphotype of Rhodnius nasutus and determine the pattern of genetic inheritance for this characteristic. Methods: Dark morph R. nasutus specimens were crossbred with standard (typically patterned) R. nasutus. Results: We present the fi rst occurrence of the melanic morphotype in the genus Rhodnius. The crossbreeding results demonstrate that the inheritance pattern of this characteristic follows Mendel’s simple laws of segregation and an independent assortment of alleles. Conclusions: Phenotypic variation of R. nasutus reinforces the heterogeneity found in the Triatominae. Descriptions of new species in this subfamily require rigorous validation criteria.