I have an infestation in the neighborhood. They nest underground. From what I've read they are difficult to get rid of. The cheapest way is to swat them with a tennis racket to kill them since it's difficult to get to the nest. I've managed to keep them to a minimum and somewhat under control but i wish i could say the same for the neighbors. They only come out at during the month of july. The males don't have stingers and they protect the hive entrances. The females go out and hunt for cicadas. I've caught them coming back with cicadas. If you don't know what a cicada is, it's the bug that makes the che che che che sound during the summer. It lives in the trees.