Tribe Myrmelachistini Forel 1912 stat. rev.

= Brachymyrmicini Emery 1925 syn. n.

Genera: Brachymyrmex (tribal transfer), Myrmelachista (tribal transfer).

Comments. These two genera form a robustly supported clade that is sister to all other Formicinae (Figure 1). Shared worker characters include a reduced antennal count (9–10 segments), five mandibular teeth, petiole inclined anteriorly and/or with long posterior peduncle, and anterior tergosternal fusion of the third abdominal segment (Bolton 2003). Both genera have the plesiomorphic palp formula 6,4 but this has been reduced to five maxillary palp segments in some Myrmelachista species (Longino 2006).