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Hi Clovis,

It is not Pales, you guessed that already. What is the colour of the palpus ?
Please note the very strong reclinate orbital birstle. So Nilea comes to mind. Nilea has smaller birstles up to halfway or more on facial ridge. So try that.
The alternative is Clemelis, which is essentially a small Nilea, but with 2 reclinate orbitals.

If possible, provide a close-up of the genitalia, these are distinctive.

And when struggling with a key, do use the interactive key on www.tachinidae.eu !!

Theo