The Schmidt Sting Pain Index is a scale that rates the relative pain caused by the stings of nearly 80 species of insects in the Hymenoptera order, which includes wasps(ジガバチ、スズメバチ), bees, and ants. It is mainly the work of entomologist Justin O. Schmidt, who spent years subjecting himself to the insects' stings, ranking them, and describing some of the experiences in colorful detail. He described the insect’s sting as feeling "like walking over flaming charcoal with a 3-inch nail in your heel.