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Hi Frits,

Acroceridae larvae is right. The adult fly should emerge in a couple of days. Please keep the spider remnants and the adult fly. I would be happy to ID the fly for you, and produce DNA barcodes for both fly and spider to strengthen this host-parasitoid relationship. So far the genera Acrocera and Ogcodes have been recorded from Amaurobius. Great observation and great pictures.

Kind regards, Christian