(14) Apterostigma robustum Emery, 1896

Figure 5C, D

Material examined COLOMBIA: Antioquia • 1 work- er; San Luis; 06°02′33.7″N, 074°59′39.9″W; alt. 1005 m; Mar. 1992; F. Sernaleg.; MEFLG 5170; Chocó • 4 workers; Quibdó; 05°40′40″N, 076°35′36″W; alt. 35 m; 23 Nov. 2001; J. Neita leg.; UNAB 4747; Vaupés • 3 gynes, 6 workers; Taraira; 01°04′00″S, 069°31′00″W; alt. 85 m; 14–20 May 2001, A. Sabogal leg.; UNAB 4746 .

Identification. Frontal lobes with each lateral margin convex and strongly curved ventrally; anterior margin of clypeus uniformly convex; mandible with 11 teeth that increase gradually in size towards the apical tooth; and propodeum in lateral view gradually higher than the metanotum (Lattke 1997).

Distribution. Apterostigma robustum is distributed from Honduras in Central America south to Bolivia and Brazil, where it occurs in the states of Amazonas, Ma- ranhão, and Pará (Kempf 1972; Lattke 1997; Fernández and Sendoya 2004).