Cicadas spend most of their lives, as nymphs, underground. The large forelegs of cicada nymphs are adapted to digging through soil.
Image from The Periodical Cicada: An Account of Cicada Septendecim, Its Natural Enemies and the Means of Preventing Its Injury by C.L. Marlatt. 1898.
These videos demonstrate Magicicada nymphs digging through soil.
Magicicada nymph excavating tunnel by Roy
This magicicada nymph is excavating a make shift tunnel sandwiched between two pieces of plexiglass.:
Magicicada nymph emerging from burrow by Roy
Magicicada nymph emerging from burrow from Roy Troutman on Vimeo.