They are plentiful right now, which tends to make me suspicious. I'm noticing them around the Brussels sprouts and zucchini, but they may be congregating elsewhere too.
Likely the striped cucumber beetle who is there for the zucchini. However as J B S Haldane said "The creator, if he exists, has an inordinate fondness for beetles". With over 400,000 species it may be a look a like. These guys cause a bacterial wilt and row covers are the best organic control. Site cleanup in the fall helps reduce the spring population
University of Kentucky Entomology