Wasp nest beetles look like what you describe, maybe not on that website. I found out about them as we had a wasps nest in our roof between the tiles and the internal liner. Our loft was "converted" when the house was built so have easy ac ess to it. Most of the wasps exited viathespace in the roof tiles but some took a "wrong rurn" and ended up in the house, about 5-10 a day. One day on inspection fowl play the Buzzard isn't a corbid