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What's Happening? - Megarhyssa atrata - female

What's Happening? - Megarhyssa atrata - Female
Beacon, Dutchess County, New York, USA
August 3, 2010
Size: 20 cm.
I found this large ichneumonid inserting it's abdomen into a small hole in a tree. Looks like it may be laying eggs. If so would they be into a larval insect of some kind? Isn't that what ichneumonids always do? Anyone know more? Anyone know the species?

Moved from ID Request.

Agree with M. atrata.
Yep, she's laying eggs in the tunnels of wood boring insects, such as Tremex. Her young will emerge and feed on the larvae of the wood-borers.

Yup really looks like Megarhyssa atrata...
I think it is M. atrata the Giant ichneumonid...

I believe it's Megarhyssa atrata. Be sure to confirm, though.

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