Most of the time you can't see them up in the tree but the other day I managed to get a few photos of the ugly little bugs. They were about 2 to 2 1/2" long and fat looking. I was surpised by their rusty orange color. I guess I expected them to just be brown and camoflauged into the tree.
There's some really cool information about them on Wikipedia which I won't go into but here are a few interesting facts. The life cycle of a southern cicada is 13 years. They begin as an egg laid in the barch of a tree twig. From there, they hatch and drop to the ground, burrowing into the earth up to 8 1/2 feet. In 13 years they come up out of the ground, mate, and die a short time later.