They can overwinter in your house, there are a variety which can emit a stink if you hurt them. There was a variety called Harlequin, they vary slightly in colour. Best Google them. My daughter had them inside her Windows , got a paintbrush flicked them outside. Not sure if they bite? Apparently if you leave them they leave in the spring of their own accord. She also found them inside her garden umbrella, unfortunately they were dispatched pretty quickly!