The wasps in the family Pompilidae are called Spider Wasps. They are solitary wasps, which nest in burrows in the ground. Their body length varies from 5 mm to 35 mm. They are black or blue usually with orange, grey or white parts. The female wasp preys on spiders to feed their larvae. She stings the spider to paralyze it and then usually drags it into her burrow where she lays an egg on it. When the larva hatches, it starts to eat the spider. When mature, the larva pupates to emerge as an adult the next summer. They are not aggressive, however can deliver a painful sting, if provoked. .