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Photo#1138531
What is this - Megarhyssa atrata

What is this - Megarhyssa atrata
Orleans, Barnstable County, Massachusetts, USA
September 13, 2015
Size: 2-3" long
Found this somewhat attached to a tree. Looked as though it was pumping its abdomen, with it tail curled, perhaps laying eggs? Then it brought its tail out to this position.

Images of this individual: tag all
What is this - Megarhyssa atrata What is this - Megarhyssa atrata What is this - Megarhyssa atrata What is this - Megarhyssa atrata

Moved
Moved from ID Request.

Yes - Megarhyssa atrata (female)…
There is a disc on the lower part of the abdomen that is actually a membrane that contains a drilling fluid that helps this female oviposit through the wood into the hidden wasp larva below it.

See reference here.

Female Ichneumonid ovipositing
I think Megarhyssa atrata

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