There's WAY too many Preying Mantises for my taste! And nice pic, Rita! What a plant to lure all those!
I've got my big huge wasps back recently! Campsomeris ephippium (no common name).
And another interesting insect! I'm not totally sure which robber fly it is, but it's similar to the one shown in url below. The prey is a paper wasp.
http://bugguide.net/node/view/...
Milkweed Bug: