Species: Possibly a Scoliid wasp, of the family Scoliidae. Found throughout North America, but especially diverse in the south.
Diet: Larvae are parasites of ground grubs, adults drink nectar.
Reproduction: Females finds a host grub and sting it, paralyzing it. Eggs are then laid on the incapacitated host and when they hatch, feed on it.
Bug Guide, Iowa State University Entomology, http://bugguide.net/node/view/91