A female--note the small, but powerful, jaws. This appears to be a defensive posture, taken, especially by the females. When picked up and placed in the open, they freeze, with those mandibles pointed upward. Note the yellow femora
, characteristic of this species as opposed to its relatives Lucanus elaphus
and Lucanus placidus
. See BugGuide
account for genus. I don't see the females very often--perhaps they don't come to lights as readily.