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Darkling Beetle? - Centronopus calcaratus

Darkling Beetle? - Centronopus calcaratus
Geneseo, Henry County, Illinois, USA
July 26, 2005
Size: 2.5 cm
I found this beetle on a dead decaying tree. I assume it is a darkling beetle of some sort, but I would like to identify it further if anyone can help me. I have found these before, and usually they are glossy black, but this one seems to have a flat black/gray color around the head and thorax. Any help. Thanks.

Centronopus calcaratus
Centronopus calcaratus I believe. This is on the big end of size for this species.

I see no spurs on the protibia. Moving to guide page.

found same thing
on my trip to north dakota, I found the same thing but wasn't sure if it was a darkling bettle or something else but if you do or did find out what it was please tell me too! Thanks!

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