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Thank you so much Theo, even down to a species level ID, I'm really impressed :). Concerning the host, now I have some doubts. I fed only 2 spp. of Lymantriidae, L. monacha (infested by a parasitic wasp, emerged on July 14), and C. pudibunda (collected on Sept. 03 on Salix, no articulate further records, but I can check if its pupa is present, it's rather easy to recognize, and then double-check to maybe exclude Acronicta, I fed many of them and the majority was infested, a common case for solitary caterpillars in autumn).