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Hello,
On September 3rd I picked up a piece of a mushroom that had lots of Hirtodrosophila trivittata on it. Unfortunately they all disappeared. On September 6th I observed some larvae on the lid of the container with the mushroom residue, which were probably looking for a place to pupate. These then vanished again. On September 15, some adult Hirtodrosophila trivittata appeared in the container.
Can anyone confirm that the larvae shown here could be larvae of Hirtodrosophila trivittata?
Thanks,
Marion

(Germany, Saxony, Pleurotus? mushroom on a dead aspen)

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2nd picture

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one of the hatched flies

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The larvae seem to belong to some Nematocera.

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From appearance and habitat, probably Sciaridae or Mycetophilidae.

The key to Nearctic larvae says

Posterior tentorial bridge complete or nearly complete (usually visible beneath integument within occipital cavity in preserved specimens without special treatment). Abdominal creeping welts without sclerotized spicules ... Sciaridae

Posterior tentorial bridge absent or if bridge partially formed, abdominal creeping welts with sclerotized spicules ... Mycetophilidae [sensu lato], in part

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Thank you both. I'll wait a while longer. Maybe a few Nematocera will hatch, but that's not very likely.
Today I visited the original location again. There were some freshly grown mushrooms populated only with Hirtodrosophila.

Best regards,
Marion