6Exif II* z ( 1 2 ; i % j Visit to Insectropolis with Brian, Nana and Papa, August 2009.
Not convinced about the species assignment, but it seems this beetle has farily extensive morphological polymorphism (for all I know the differences could just be from sex or life stage). Very similar specimines are near the bottom of this page.
From Wikipedia:
"Stag beetles are a group of about 1,200 species of beetle in the family Lucanidae, presently classified in four subfamilies. Some species grow to 8 cm (3? in), but most are about 5 cm (2 in).
The English name is derived from the large and distinctive mandibles found on the males of most species, which resemble the antlers of stags.
Male stag beetles use their jaws to wrestle each other for favoured mating sites, but despite their often fearsome appearance they are not normally aggressive to humans.
Female stag beetles are usually smaller than the males, with smaller mandibles.
The larvae feed for several years on rotting wood, growing into grubs which in larger species may be the size of a human finger."
Museum Homepage