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OK ! So, these genitalia are highly characteristic and therefore a big clue. They resemble Allophorocera ferruginea, which of course is a very yellow species.
But it matches in alle features and in locality with the rarely collected Alpine Allophorocera pachystyla. So that is what it is .

Excellent find, nice work. Possibly / probably the first time its genitalia got illustrated, please submit for the gallery !

Theo