Megarhyssa atrata

Megarhyssa atrata, also known as the black giant ichneumonid wasp, is a species of large ichneumon wasp. It is known from North America, where it is found from Quebec, Michigan, Ohio and North and South Carolina to Florida.

Adults are on wing from May to July.

Behavior
The larvae are parasitoids of the larvae of the woodwasp Tremex columba in dead deciduous trees.

Female M. atrata burrow into wood with their ovipositor while secreting a substance that breaks down the wood.