We had two in the master bathroom--so the assumption is that some of them got into the crawlspace above the house, and found an opening into the ductwork. It can't be a large opening, or we would have had more than two.
So we set off two bug bombs in the crawlspace.
No more in the house--but they are beginning to fly around outside. There's no visible nest--so we decide to seal off a couple of holes at the end of the house where the satellite dish cables enter the house.
Yesterday, my wife was out on a bug hunt, spraying them out of the air with an aerosol wasp killer--and she sees a couple of them crawl out of these gaps:
Click to enlarge
It turns out that the siding, presumably for appearance reasons, is scalloped at the top--and where it meets the vertical pieces, there is a triangular gap about .8" high, and .25" at the top end of the triangle.
We have also noticed a number of other gaps around the house where the builder didn't caulk over some sizable openings. Some of the larger ones we have carefully cut trim pieces to cover, and we have caulked the smaller ones. But these gaps in the siding--there's a lot of them.
One possibility is to use 1/4" and 3/16" dowel rods, inserted into the gap, so they aren't visible except by getting parallel to the wall. These will leave so little space that the wasps can't get in or out. I might squirt a small quantity of clear caulk in as well, to make sure that no other bugs can get in or out.
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