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Hi Brigitte and Piluca

Here is my personnal little key to differentiate E. interrupta, E. abusiva and E. arbustorum :

1
- Black vertical strip in the middle of the face present => E. interrupta
- Black vertical strip in the middle of the face absent or hardly visible => 2

2
- Short haired arista => E. abusiva
- Long haired arista => E. arbustorum

On the picture 2 we can see short haired arista than lead to me to eliminate E. arbustorum.
We don't see the black vertical strip BUT for E. interrupta this strip is not wide like in E. tenax (or like E. jugorum in your precendent treat) and can not appear on picture.
So, with this pictures, it could be E. interrupta or E. abusiva. We need a picture of the face where we can see (or not) the strip ;)

P-Y