What's That Bug? does not endorse extermination

Subject: What’s that in Marblehead, MA
Location: Marblehead, MA USA
July 16, 2013 5:16 am
This was hanging outside….
Signature: Theresa

Giant Ichneumon Ovipositing

Giant Ichneumon Ovipositing

Dear Theresa,
This is a harmless, beneficial, parasitic Hymenopteran, a female Giant Ichneumon,
Megarhyssa atrata, and she is in the act of ovipositing.  She uses her long ovipositor to deposit an egg beneath the surface of a dead or dying tree or branch that are infested with the wood boring larvae of a Wood Wasp known as a Pigeon Horntail.  The egg hatches and the larval Giant Ichneumon feeds upon the larval Wood Wasp.  Giant Ichneumons are commonly called Stump Stabbers.

What's That Bug? does not endorse extermination
Location: Marblehead, Massachusetts

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