Scout ant

Scout ants are a caste of Giant Ants serving as scouts, workers, and drones for the ant colony.

Background
Scout ants were used quite prodominantly during the Giant Ant missions as worker drones and scouts, often locating nearby human settlements and relentlessly attacking them often wiping out all enemy forces. The Scout Ant often used its mandible to attack human forces, killing infantry in less than a second but often had great difficulty destroying metal vehicles and concrete structures.

Furthermore, their increased speed and enhanced mobility was due to the sacrifice of a thinner carapace and could easily be killed by gunfire.