Oh no! Look how many! I have blister beetles eating my hostas but not the same kind. Mine are just solid grayish. I haven't seen striped ones like that. Gardening has way too many enemies. It's discouraging.

I have had those. I sprayed with Sevin and they left, but then they would appear somewhere else. They ate leaves off my Cherokee Purple on one side; the tomatoes then sun burnt. Another time they were on grass and I mowed over them. I went in to get my sprayer and when I came back they had flown away. The behavior is not like the gray ones. Before you know it they can have something completely eaten up.