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Photo#25177
Darkling Beetle? - Xylopinus saperdoides

Darkling Beetle? - Xylopinus saperdoides
Boxborough, Middlesex County, Massachusetts, USA
July 6, 2005
Size: 12-14mm
Found under bark on a dead stump.

Tenebionidae: Tenebrioninae: Xylopinus saperdoides?
If it is about 25 mm long or so, I think Xylopinus saperdoides is very likely.

 
Size
After going back to the original image, and using a mark on my hand for size comparison, this and the red legged one are 12-14mm. It does look like the one in this site, and they list it as 12-16mm. They alos mention a red-legged race, and both are found under bark on oak, and that's where I found them both together, under oak bark.

Tenebrionidae.
Yes, this is a darkling beetle, but I have no idea which one:-)

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