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Campsomeris trifasciata
Large wasp with red and black zig-zagged patches on the abdomen
On rain lilies in a suburban yard
That's a female. Take a look here also:
http://edis.ifas.ufl.edu/pdffiles/IN/IN7...
On something a bit off topic,
The article states, "There are nine Nearctic species of Campsomeris, of which four occur in Florida." And then goes on to show the four. Maybe it means 4 native. Campsomeris dorsata (not mentioned) from the Caribbean seems to be established in South Florida now.
http://bugguide.net/node/view/497494