Who did this?

[David Meiland]

Was removing carpet in a slab-on-grade bedroom addition and found the wood debris in the attached photo in a couple of spots. Looks to me like someone's been tunneling the PT bottom plate. Found a couple of possible culprits as well. Can anyone ID?

[Jim Katen]

The debris looks like it might contain some pupal cases from ants, but probably not carpenter ants. Probably some nondescript little ants; the kind that people call "sugar ants." 

The first culprit is some kind of rove beetle. Possibly the one romantically called the devil's coachman. The other is just a garden variety beetle. No idea what kind, but not one of the wood borers. 

I'd just vacuum up the debris, and sprinkle a little boric acid on the perimeter of the slab before installing the new carpet. 

[DavidMartin]

I think it looks like beetles.

[Erby]

Another spammer?

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I see the spammer comment has been removed.  Thanks, moderator.

 

 

Edited October 7, 2018 by Erby

[John Kogel]

Carpenter ants is more likely. They are more industrious that beetles, constantly cleaning house.

I have seen this mess in my own house and have done the forensics.☹️

[John Ghent]

Here is a pix of a black carpet beetle.  The debris does not look like carpenter ants which leave a frass that looks like it came from sawn wood.