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What came out of this?

What came out of this?
Ashburnham, Worcester County, Massachusetts, USA
March 17, 2011
Size: ~3-4mm
This was on the trunk of a dead beech tree.


Moved from Unsolved Bug-related Mysteries.
I keep finding these, but have yet to see one that looks fresh / worth collecting.

Have you found any more of these?
I found at least 20 of them today, all on young black birches. I'd say they were all 2 mm long, or 3 mm at most. A couple had what looked like eggs in the holes. I'll post pictures eventually. Very strange.

No others
This was the only one I've found. Hope yours can be figured out with the eggs inside.

I just posted some examples here. Still no idea what they are.

Quite a few empty cases
Hopefully one of us or someone else will find a fresh on and rear it out.

I would think this is a mud daubers nursery, we have several types of mud daubers around our house so I see their nurseries a lot

Probably some sort of parasitic wasp
but it's way too small for mud daubers. The whole nest is only about 3 or 4mm long.

Moved from ID Request.

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