If you want to know how to catch a queen ant, start by digging up the colony. The queen ant if it's a wood nest, will be with the first brood. Carefully peel back the bark and remove it.

The queen is usually much larger than the worker ants, but it gonna be difficult to catch one. They say that when you see two ants mating, that the smaller one is the male who is going to die, and the bigger one will be the queen.