Note:  Do not rely on this information. It is very old.

Stag Beetles

Stag-Beetles, a group of beetles belonging to the family Lucanidae, and including the largest of British beetles. The name is derived from the large horns possessed by the males. The largest British species is Lucanus cervus, of which the males are sometimes over two inches in length. The larva is a large fleshy, wood-eating grub, and may have been the "Cossus" which was eaten by the Romans as a great delicacy.