Parasitoids of insect larvae, the Pelecinid Wasp female uses her extremely large abdomen to thrust through soil to deposit eggs primarily on scarab beetles. I assume the family and genus names are derived from the Greek – pelicos, referring to the great size of the wasp. Females can reach lengths of up to 6 cm. No need to worry, these guys do not have stingers.
-OZB
A Thousand Acres of Silphiums 