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What is this? - Sirex nigricornis - female

What is this? - Sirex nigricornis - Female
Philadelphia, Kensington County, Pennsylvania, USA
September 17, 2012
Size: approx. 1.5 inches long
These bugs have recently shown up in our house. They seem to mostly crawl around, but they do have wings and will fly short distances if disturbed. They have an orange abdomen that is hidden in the photo. I will often find one crawling on me, sometimes on my hand, while sitting on the couch. Very creepy....

Moved from Horntails.

Sirex nigricornis Fabriciius. Larvae live and feed in conifers, most commonoly pines. Usually attacks dead or weakened trees. They must be emerging from a pine log or stump nearby. They will not go into structural wood in buildings.

Moved & cropped for expert attention; female horntails
nice bug

Moved from ID Request.

Should I be concerned that these have been showing up inside? I would say I see anywhere from 3 to 6 per day. What can I do to get rid of them? I see that they lay eggs in trees. Would they also lay eggs in wood within the house?

no concern, they do not breed indoors
brought inside with firewood? is that a possibility? indoor fireplace. I indoor fireplace. I do have wood stacked outside though, for a fire pit. That wouldn't explain them coming in. I did just get a dog, and we've been leaving our sliding door open more often for her.....I thought that might be a possibility.

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