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Today at Zaragoza, Aragon, Spain. 200 meters high, continental-mediterranean climate. I was breaking a dead trunk of Populus nigra in search of beetle larvae. In the most moist -very, very moist- part of the trunk, I had a big surprise for find.... ???an adult fly!!!! completely inside a medium-sized trunk. I thinks that the larvae of this fly was xylophagous and the fly was newly emerged...
The size is the same than Musca domestica, more or less. About 5-6 mm.
What can be?





and now in the habitat


I also found fles under barks: adults Lucilia, Calliphora vicina and Eristalis tenax, all in the same tree, looking for pass the winter...

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Melinda ?


Theo

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Thanks...
More suggestions?

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Isidro

My immediate impression was Melinda, but I didn't say so because I couldn't shed any light on your feeling that it was a xylophagous species. Melinda are parasites of snails and slugs.

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Thanks Susan..

Is not necessary that this fly have a xylophagous larva. The only thing that I know is that the adult fly was into roten wood, in a trunk of Populus.