Distribution. Colombia, Venezuela, Peru, Brazil, Bolivia, Paraguay, Uruguay, and Argentina.
Distribution in Colombia. Caquetá and Cundinamarca.
Remarks. Diceraeus melacanthus has the mandibular plates acute, the ventral margin of the pygophore is medially bisinuate, and the gonocoxite VIII is flat, not inflated.
References. Grazia 1978; Barão et al. 2020