Perhaps this can help narrow it down. The descriptions of this particular Family of beetles sounds correct for your fellow. Though there are apparently about 20,000 possibilities yet. I think it would be safe to say he's probably not a threat to you unless you have some exotic plants. The thing that would concern me is if this critter's favorite food was another kind of insect. You wouldn't find him there for long if you did not have food for him.
Very nice photography, btw. What is it that the critter is standing on? Paper?
http://eny3005.ifas.ufl.edu/lab1/Col...Scarabaeid.htm
or
http://tolweb.org/tree?group=Glaresi...carabaeiformia
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