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Tettigoniidae sp.
Katydid, any of numerous predominantly nocturnal insects related to crickets and grasshoppers and noted for their loud mating calls. Katydids have large hind legs and are distinguished by their extremely long, threadlike antennae and the thick, upwardly curved ovipositor (egg-laying structure) of the females.
Gardens/Flowers in Lalbaugh Botanical garden
I am guessing it is related to the Subfamily Phaneropterinae, due to the presence of tympana on the forelegs. There are over 6,000 species of Katydids worldwide.