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Stilpnochlora couloniana
Great find! Stilpnochlora couloniana, seems to only have been found in Florida and looks just a little different than the katydid you found. I am pretty confident that you have Microcentrum rhombifolium here. Check out the link I provided and compare. Here is a link to the Bugguide page for Stilpnochlora couloniana: http://bugguide.net/node/view/6347