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Ibalia anceps
Body length about 12-14 mm, colored as shown. Abdomen laterally flattened so that it appears paper thin in dorsal (top) view.
Found "sleeping" on vegetation by Heidi Eaton, near edge of pond. Surrounding habitat includes riparian trees and herbs with some evergreen trees, plus open meadows.
Ibaliids are parasites of horntail woodwasps (Siricidae), but are themselves related to gall wasps (superfamily Cynipoidea).
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