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Tibicen tibicen
About 2 inches long, one of the biggest I've ever seen
Compare the following:
"Swamp Cicada", Tibicen tibicen (syn. chloromerus)
http://bugguide.net/node/view/734701
"Lyric Cicada", Tibicen lyricen
http://bugguide.net/node/view/12261
"Dark Lyric Cicada", T. lyricen var. engelhardti
http://bugguide.net/node/view/60925
Note the following characters:
leg color (green in tibicen & brown in lyricen/engelhardti)
pronotal color (large green pronotal patches vs. black pronotum with centralized yellowish-green anchor-shape)