Family: Lucanidae
Subfamily: Lucaninae
Length: 15-25 mm
Dorcus parallelus
is dark brown to almost black, perhaps with a purple cast
as shown. The mandibles of the male are not as huge as they are
on certain other Stag Beetles, but they are interesting for having
a single "horn" on each mandible. The lucky naturalist
may find an adult wandering around on the ground, but more often
they are noticed when they show up at lights. Adults are most
commonly encountered in May, June, and July. The larvae feed in
decaying stumps and roots of hardwoods including Oak, Linden,
Maple, and Elm.
One text mentions that females are "rare" and certainly it seems they are encountered less often than are the males. The appearance of females is similar to that of the males, with the head and mandibles a little smaller.
Left: Lateral view of Dorcus
parallelus
At right, a close-up view of the
male's head and pincers. Note the horn on each pincer, most easily
seen on the beetle's left horn in this photo.
