Zeegers wrote:
I agree

Tabanus with 3 eye-bands are not that common.
T. nemoralis and T. glaucopis come in mind, given the locality.
However, I would need to see the fly in front view to be more sure.


Theo Zeegers

Zeegers wrote:
Oke, this helps.

It is Tabanus glaucopis, one of the possibilities mentioned.

Thanks


Theo

Zeegers wrote:
OK.

The stripe between the eyes, in frontal view, is called the frontal stripe.
There are dark markings on this stripe. Usually one below, the lower callus, and one in the middle, the upper callus.
In this case, you can see that the upper callus is broad (not linear) and separated from the lower callus.

Then, the most crucial feature:
below the frontal stripe, just above the antennal base, their is a more or less triangular area called the subcallus. In most Tabanidae, this subcallus is greyish dusted. However, in T. glaucopis is is shining black.
It is difficult to see in your picture, but have a look at the one by Gerard Pennards in the gallery and you'll see what I mean.

This, and the 3 stripes on the eye will lead to T. glaucopis.

Theo