“…Diagnosis: - Preocular and frontal carinae subparallel, extending to the posterior cephalic corner to form a more or less distinct antennal scrobe (Mayhé‐Nunes & Brandão, : figs 2, 5, 8, 11, 14; Mayhé‐Nunes & Brandão, : figs 9, 13, 25, 29, 33, 37; Mayhe‐Nunes & Brandão, : figs 1, 5, 9, 15, 19, 23; Rabeling et al ., 2007: figs 8B, 19B).
- In frontodorsal view, median pronotal spines absent or strongly reduced; when present, tooth‐like and fused at base; in some species apices of both teeth distinguishable, in others, both teeth entirely fused and only recognizable as a single median tooth (Mayhé‐Nunes & Brandão, : figs 11, 15, 27, 31, 35, 39; Mayhe‐Nunes & Brandão, : figs 2, 7, 11, 17, 21, 25).
- Dorsal surface of mandible smooth and shiny, without distinct striae; in some species [e.g. M. turrifex (Wheeler)] striae present at the base of the mandible.
- Eyes variable in size and often relatively flat.
- Widely distributed throughout South America (22 species), with five species in Central America [ M. isthmicus (Santschi), M. opulentus (Mann), M. squamulifer (Emery), M. turrifex (Wheeler), M. zeteki (Weber)], three in the Caribbean [ M. haytianus (Wheeler and Mann), M. jamaicensis (André), M. jamaicensis antiguensis (Weber)], and two in North America [ M. jamaicensis (André), M. turrifex (Wheeler)].
…”