Anterior face of the gaster flat or convex..........4
Anterior face of the gaster concave...................5
4) Antennae inserted at a short distance from the margin of the clypeus (Clp) (Fig. 34)
.........................carpenter ants, Camponotus spp.
Antennae inserted close to the margin of the clypeus (Clp)………thatching ants, Formica spp.