CLOSED: Very large black beetle

Buffalo, NY(Zone 6a)

Last week DH found a big, very dead black beetle. Yesterday I found another one, only alive. I went to bugfiles & its Aulacocyclus edentulus. I took pics of live one. (it was moving very slowly). The thing is, I have never seen one of these in the 25 yrs. I've been gardening. It is definetly not a cicada. Does anyone know if it is beneficial? Or not? I'll post pics, but until then, I need to know if it eats things....like tomatoes. Or cukes. Thanks in advance, Gloria

West Pottsgrove, PA(Zone 6b)

They eat rotting logs... I'm experiencing confusion (not unusual...) It's in the Family Passalidae, maybe
Odontotaenius disjunctus is a different name, or similar beetle. In bug files, the page says PLANT name? I dunno...

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