Giant beetles with males possessing huge stag-like mandibles
Giant Stag Beetles can be serious pests, ravenously devouring crops. Even a single beetle can destroy the crops of an entire farm in mere hours. Adults of both sexes are about 10 feet long. Stag beetles are so called because the huge mandibles of the males resemble the antlers of a stag.
Basic Fantasy Field Guide Omnibus
Woodland beetle that plagues farmland by feeding on young grain shoots
Giant stag beetles live in woodlands near farmland, preferring for food the young shoots of cultivated grains. For this reason, they can often plague regions and even cause famine should enough of them descend upon an area.
OSRIC