Messor (3)
Clypeus emarginated (*). Head with small erect quetae in frontal view, all over its perimeter. Rugose sculpture well developed	Clypeus denticulated in its anterior margin. The head in frontal view can have erect quetae in the occipital border of the head, but without them on the genae. Sculpture weakler, specially on the head, which can be smooth in its majority
structor	Grupo barbarus (barbarus, capitatus)
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(*) Except in the minor workers, which clypeus is very similar to barbarus group