Both as adults and as white grubs (the larval stage), Japanese beetles are destructive plant pests. Adults feed on the foliage and fruits of several hundred species of fruit trees, ornamental trees, shrubs, vines, and field and vegetable crops.
This video of Japanese beetles shows indentifying features on adults. Notice the metallic coloration and tufts of hair along the sides of the abdomen under the elytra. Elytra are the front wings on Coleoptera that protect the membranous hind wings underneath.