It’s a Japanese beetle (at least, that is certainly what it looks like). If it is, you really want to do something, because they will strip trees and plants bare. I have found the best approach is one of those beetle bags. It will attract them from a long distance, and you will end up with bagfuls of beetles squirming among beetle corpses. At the height of the season, I will be getting ~1 bag per day. Spraying had little effect, but the bags worked wonders.
It’s kind of hypnotizing watching the beetle bag sway on a still summer afternoon, because you know that it is the frantic movements of these desperate miracles-of-nature trying to escape their stench-filled coffin that is providing the movement. At least, this is hypnotizing and gratifying after you have seen the devastation that they do to otherwise healthy trees.
The best way to use those bags is to put it on the far back corner of your neighbor's yard, as far away from yours as possible.
While they indeed work, they're actually not recommended because of their successful attraction of the beetles. Those that are attracted to your yard that don't end up in the bag will end up on all your plants, mating and eating.......