I removed a 18" piece of 2x4 board from a retaining wall behind the shed in my backyard that has many hollow tunnels running through it and as I was sawing it out the Camponotus were swarming in and out or the tunnels but would all return inside when I stopped sawing. I now have the 18" piece of wood inside a large ice-chest with a well sealed lid. Is there a good way to lure them out so I can move them into a formicarium. The pic is of one of the workers.