Trap-making
Manufacturing this trap is an incredible act in itself. The workers construct the traps on the stems of the plant, basically by making a raised and hollow platform on one section of the stem. The structure itself simply looks like a part of the plant, as if it grew in width slightly. The ants will also make small holes in this platform which are slightly wider than their own bodies. The individual workers will hide in these holes underneath the surface, invisible to their prey from the outside. They will position their heads outwards from the plant with mandibles open, waiting for prey.
The actual production of the trap occurs by first cutting plant hairs (trichomes) from a narrow vertical stretch of the stem outside of the domatia. The ants will then arrange these hairs to outline the structure of the trap and regurgitate the mold that acts as a paste and holds the trichomes together. They use their fungal relationship to gather this mold, by collecting the mycelium from the fungus grown on the plant. This mold will continue to grow in between the trichomes and around the holes to fill out and reinforce the structure.
Read more about this topic: Allomerus Decemarticulatus