Subject: beetle
Location: northern wisconsin
February 26, 2013 12:05 pm
We have been seeing these insects inside the house for the last several weeks, perhaps one or two a day. We don’t remember seeing them in the house prior to this winter. They started appearing after our first significant snowfall of the winter. They can appear anywhere in the house and are very slow moving, rarely flying.
Signature: Bob and Martha

Longhorned Borer Beetle

Longhorned Borer Beetle

Dear Bob and Martha,
Do you burn firewood in the home?  We suspect you brought in some wood and these Longhorned Borer Beetles had been living in the wood as wood boring larvae, and that they were most likely in the pupa stage when the heat of the home caused them to emerge early.  We are pressed for time this morning, and cannot browse through the family Cerambycidae on BugGuide to identify the species.  Perhaps while we are at our regular job, one of our readers will supply a comment with an identification.  We will try to determine a species at a later date.

Update:  February 27, 2013
Thanks to a comment identifying this as a Tan Bark Borer, Phymatodes testaceus, we are investigating on BugGuide
.  It appears we might be getting confused with Martha.  According to BugGuide, the Tan Bark Borer is:  “native to Eurasia; widely established around the world, incl. e. US and, more recently, in the Pacific Northwest”

Thanks for the tip – we do burn firewood and Martha suspected that that might be the source of the beetle.  From the photos on your site, we think that it is an oxycopis thoracica
Bob and Martha

Well, on further review it appears to be Phymatodes testaceus, which makes more sense given it’s oak firewood origin.
Thanks again,
Bob and Martha

Hi again Bob and Martha,
When we received a comment that this was a Tan Bark Borer, we turned to BugGuide.  We saw your submission that “Martha thinks they are coming from the firewood” and we suspected that we were being confused with Martha Stewart.

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Location: Wisconsin

2 Responses to Tan Bark Borer may have emerged from firewood

  1. Arianna says:

    Phymatodes testaceus — Tanbark borer.

    • bugman says:

      Thanks Arianna,
      We will take a look and update the posting. We needed to get out of the (home)office and to our real job, and it is so nice to return with a possible identification.

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