Large yellow ants

Pest problems with larger yellow ants usually occur in the late summer and fall when mixed colonies of winged swarmers and wingless worker ants move toward buildings and try to enter through cracks or gaps in the foundation. The temporary indoor, winter nest is usually somewhere in the basement under a loose brick or board or in a crack in the wall or floor. The ants do not forage for food through the house and apparently cause very little damage except to create piles of dirt at the entrance to the nest. Reportedly, these ants try to return to the outdoors sometime in the early spring if left undisturbed.