It’s been about six weeks since the emergence of Brood VIII in Pennsylvania, Ohio, West Virginia and Oklahoma. Now (first week of August) is a good a time as any to check for periodical cicada nymphs that have hatched from eggs laid in branches. Once they hatch they’ll find their way to the ground, where they’ll find and begin feeding on roots for the next 17 years.
Look on branches where cicada laid their eggs.
An illustration of egg nests (Marlatt 1907 Egg Nest Detail):
A nymph on a branch with adult male finger for comparison:
Close up:
Another close up: