Phyllophaga rugosa

Also known as Rugose May Beetle, Wrinkled June Bug

Rugose June beetles emerge en masse on warm late spring and early summer evenings, clumsily buzzing toward artificial porch lights and window screens. Beneath the surface, their stout C-shaped larvae spend years subterraneanly grazing on the fibrous roots of grasses, deciduous seedlings, and prairie plants. Adults feed high in forest canopies on broadleaf foliage, mating before females burrow back into undisturbed turf to deposit clutches of eggs.