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the base of a tree with some of the driest dirt in virginia, the traps of an antlion larva and a juvenile purseweb spider wait to catch some food the antlion digs a conical pit in sandy soil, when an insect walks too close it falls towards the bottom where the larva is buried. the larva's large mouthparts wait for something to hit the bottom so they can dig in the spider lives in a silk-lined burrow in the dirt, but the silk lining extends upward (usually along the base of a tree, but this one's not flush against the trunk). coated in dirt, the tube is not obviously a spider's web... but when an insect walks across it, the spider runs up and attacks from inside the tube.