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I asked Kees van Achterberg for information on the biology of Trachyusa aurora. Kees told me that T. aurora is recorded as a parasite of Trichiosoma (Trichiosoma) sorbi [Hymenoptera: Symphyta: Cimbicidae]. However Kees told me that this record is not correct! So the biology is still unknown.
That the record is incorrect is not surprising since Alysiinae are known as endoparasites of cyclorrhaphous Diptera. So Dima, also this hymenopteran found a good forum to be posted upon:D.

Jan Willem