Answer
This is a species of blister beetle (Lytta aenea), and touching it is a very bad idea (so is eating it, by the way). When agitated, blister beetles emit cantharidin, a toxic chemical that creates painful blisters on human skin. (Extra credit answer: The yellow stuff is pollen.) For more about blister beetles, check out this essay from our Outside Story archives.
This week’s contest winner was Emily Uhrig