You might also check the Scoliid wasps. Campsomeris Ephippium is the largest wasp I've seen that comes here, but it's not like yours. http://bugguide.net/node/view/...
My occasional visitor, C. Ephippium:
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority. E. B.White
Integrity can never be taken. It can only be given, and I wasn't going to give it up to these people. Gary Mowad