Subject: Cottonwood Stag Beetle
Geographic location of the bug: New Castle, Colorado
Time: 12:25 AM EDT
Your letter to the bugman: I was picking up some trash in my yard when i noticed a pretty big black beetle eating what looked like a smaller beetle without its head. I took it inside to show my family and when I went to go let it back outside there was another one right where i found the other one!
How you want your letter signed: KD
Thanks so much for sending in your images of male Cottonwood Stag Beetles, Lucanus mazama, though we believe the predatory behavior you believe you witnessed was actually something else. The Generic Guide to New World Scarab Beetles has a nice comparison to help differentiate the sexes of the Cottonwood Stag Beetle.