Larvae look very different than adults. They are spiky and dark. They hatch from inside the leaves, where females embed their eggs. This also causes damage.
Details of the:
Hazelnut Lace Bug
Category: True Bug
Common name: Hazelnut Lace Bug
Scientific Name: Corythucha coryli
Size (Adult, Length): 3mm to 8mm (0.12in to 0.31in)
Identifying Colors: black, brown
Additional Descriptors: transparent, lacy, flying, striped
North American Reach (Though Not Limited To*): Alabama; Connecticut; Delaware; Florida; Georgia; Illinois; Indiana; Kentucky; Louisiana; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; New Hampshire; New Jersey; New York; North Carolina; Ohio; Pennsylvania; Rhode Island; South Carolina; Tennessee; Virginia; West Virginia; Wisconsin
* Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.