From the Galveston County Master Gardener:
"Wireworm" is the name given to most larvae of the very large click beetle family. Many of these larvae are notorious pests that consume the roots of cereal crops, causing serious damage. Unlike its many cousins, the Eyed Elater larva is [a] ferocious meat-eater that dines on many other noxious larvae, including those of wood-boring beetles, flies, and other undesirables.
Photo by Jackie Leister.