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 
Great shot! 🙂
We called these “Sewing Bugs” as kids. The rumor had it that they would land on your back and sew your shirt to the flesh of your back! All the kids ran from them like mad. I figured out that they were not so terrible after all. Rarely see them anymore around our area, unfortunately.