The digger wasp.
digger wasp definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of various wasps from several families, that lay eggs on caterpillars, spiders, etc. that they have paralyzed and buried in nests dug in the ground
digger wasp definition by American Heritage Dictionary
Any of several burrowing, usually solitary wasps of the family Sphecidae that excavate nests in soil which they provision with prey paralyzed by stinging for their larvae to feed on.