I had a run-in with a few the other day... bastards are serious about protecting what they consider their territory.
Fortunately, their nest was in a position so that only one or two could come out at a time... so once I figured out where they were coming from, I just sat there with some flying-insect killer... spraying at and into the entrance as they each came out... one or two-at-a-time, to their death... looking around to make sure there wasn't some secret "back entrance" I didn't notice through which others were escaping.
18-or-so in total. not that big of a nest, I guess.
