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