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Boisea travittata
My mom was hiding eggs on easter Sunday and said that these started swarming when she set an egg down on the ground. There were dozens and dozens of them.
Under fallen leaves on a wide, grassy space right next to a lake. The grass was very short there and is mowed often. Trees and thick undergrowth surround it.
Identified by Jellis. Pictures taken with iPhone 5.
Those are the nymphs ( juvenile stage ) of some sort of true bug; they are not beetles. I don't know ID off the top of my head.