I live in Northeast Wyoming in a very old house. It seems like in the late spring and late summer, my house gets infested with these beetles. They are fairly innocuous, it seems they just crawl around on my walls, windows, and ceilings. They eventually they just fall dead to the floor after a short time. But it’s very annoying having them crawling all over the walls every time I come home. It seems they come out of my ceiling and through the cracks around my window frames.
Your beetle is one of the leaf beetles in the genus Trirhabda. It is probably the goldenrod leaf beetle.
They are found from southern Canada south into TX. The adults and larvae feed on goldenrod as the name suggests.
They overwinter as eggs which emerge in the spring when the larvae will start feeding on goldenrod leaves. There is one generation per year.
If they are coming into your old house,perhaps there are holes in vents, windows or doors where they are getting in. They do not want to be there as much as you do not want them there 🙂
These do not bite or sting.