Subgenus Dichrotrigona Engel, 2021

Diagnosis (Adapted from Engel 2021): Integument predominantly black; mandible with five teeth; labrum simple; metatibia enlarged and flattened, with the outer surface close to the concave apical third; metatibia with developed corbicula; forewing membrane dichroic, proximally infuscate, apically whitish; and metasoma elongated.

Comments: The character “metasoma elongated” is added here in the diagnosis of the subgenus for the first time. As reported by Engel (2021), this subgenus is similar to T. (Aphaneuropsis) in pattern of wing coloration. Still according to this author, T. (Dichrotrigona) easily differs from T. (Aphaneuropsis) in the five mandibular teeth, among other characters. However, we believe that the metasoma elongated can be very useful for identifying this subgenus, especially to differ from T. ( Trigona s. str.) (metasoma subtriangular, except T. (Trigona s. str.) dallatorreana).