Now that Fall is here, we no longer hear Cicadas in the neighborhood at night. But durng August and most of the summer these buggers seemed to be pretty numerous. The photos are of a couple that we found on one tree outside our house this year. They have three small eyes located between their two large eyes (for a total of five eyes!) and only male cicadas make the loud sound that you hear on summer evenings. S. notes that some people eat cicadas. Cicadas apparently can be prepared in various ways. (See Washing Post article "Cicada: The Other White Meat").
Wikipedia describes their life cycle as follows:
After mating, the female cuts slits into the bark of a twig, and into these she deposits her eggs. ... When the eggs hatch, the newborn nymphs drop to the ground, where they burrow. Most cicadas go through a life cycle that lasts from two to five years. Some species have much longer life cycles, such as the North American genus, Magicicada, which has a number of distinct "broods" that go through either a 17-year or, in the American South, a 13-year life cycle.... Cicadas live underground as nymphs for most of their lives, ...In the final nymphal instar, they construct an exit tunnel to the surface and emerge. They then molt (shed their skins), on a nearby plant for the last time and emerge as adults. The abandoned skins remain, still clinging to the bark of trees.