Megarhyssa greenei
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Megarhyssa greenei, also known as Greene's giant ichneumonid wasp, is a species of large ichneumon wasp. It is known from the United States and Canada.
Megarhyssa greenei female
Megarhyssa
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Megarhyssa, also known as giant ichneumonid wasps, giant ichneumons, or stump stabbers, is a genus of large ichneumon wasps, with some species known for having the longest ovipositors of any insects.
Megarhyssa greenei
…a parasitoid wasp, and its host is Tremex columba, a sawfly. Females must find a larva of this species, and lay an egg close by or on it. The larva of Megarhyssa devours it, it pupates under the bark of trees, and it emerges as an adult one year later. Photos on BugGuide.net…
Female Megarhyssa praecellens in China