Stump Stabber caught Ovipositing

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.

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