Not to scale.
Japanese Beetles have eaten many of the leaves on our River Birch this year. They are worse on this tree this year than in the past. The leaves look like skeletons, die, and drop to the ground. It will be good when the beetles have completed this part of their life cycle.
Our View From Iowa 
Does the same to rosebushes. grrr
Oh yes. Grrr
A shame they are so invasive/destructive as they are fairly lovely. At least they don’t hurt our milkweed…the monarchs and tussocks are doing a nice job of that. Everything else is an unwilling host for these.
They are nice looking insects. In Japan, they aren’t a big problem as they have natural predators. Here they have none that can control their population.
I have a photo of a leaf that looks almost exactly like the skeletonized example in the illustration, I found my example in the woods in east Texas, and wondered what had caused the damage. Now, I may know.
Quite possibly this beetle.