Wood-boring-host
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Megarhyssa greenei
Greene's Giant Ichneumonid Wasp
Megarhyssa greenei is a large ichneumonid wasp known from the United States and Canada. Females possess an elongated ovipositor used to parasitize larvae of the sawfly Tremex columba, commonly called the pigeon horntail. The species is frequently confused with the similar Megarhyssa macrurus but differs in relative ovipositor length and facial markings. Adults emerge from pupation under tree bark after approximately one year.