Look for images of the grubs of green fruit beetle, Cotinis mutabilis

If that's what you have, not a problem. They eat dead stuff -- often in compost piles -- not live plants.

The grubs you find in your soil are the larva of one of many members of the Scarab Beetle family, some 30,000 beetles that includes our common June Bug and the Japanese Beetle. About this time of year most will be starting to pupate to become the adults we see for a short time while they, the adults, mate and lay eggs that will become next years beetles. For these grubs to be a real problem you need about 10 per square foot, however any you do find can be put out for the birds and, especially, the various blackbirds you may have around you will really relish them.