Found at a light. Chilled and posed. This appears to be a female, based on the small size of the jaws. This is a presumption. I know that in many of the horned scarabs, there are "major" and "minor" males. The minors have small jaws, like a female, and attempt to sneak matings, basically, masquerading as females. (I need to find the reference on this!) The same thing could be true in stag beetles, which are close relatives of the scarabs.