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Thanks for the acetone tip.

It is strange that out of 10 rared Triarthria setipennis 2 have become very greasy (they did not feed). Maybe I have punctured something inside the fly that made grease leak out. I have other greasy specimens too, but like I said I thought it could be stomach content or something.

Sadly I will porbably never experience the "grease capabilities" of Pantophthalmids :)