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Hello,

I have this male, caught near a lake in western France.
First of all, I'm not sure about the genus...
Eyes clearly haired, no tubercle on vertex between eyes like in Hybomitra.
In north western France, if it's a Tabanus it's nemoralis (upper eye facets clearly enlarged) but antenna are yellow (black in nemoralis). Colour of eyes seem to be not as Atylotus (dark here).
So an Hybomitra for me.
- Long hairs on first antennal segment.
- Angle between lower margins of eyes : 90°
- bimaculata have facets of same size
- Upper facets clearly larger than lower facet muehlfedli excluded and distinguendahave yellow hairs on first tergite, blak here) = solstitialis













Benoît

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Notopleural is dark, so can't be solstitialis.
To be honest, looks more like an Atylotus ?

Theo

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Check this, for instance

https://waarneming.nl/observation/221552800/

In this case c/should be rusticus (?)

Theo

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Thanks Theo for your answer.
In direct comparaison with my specimens of rusticus I have some differences :

Head :
- first antennal segment more than 2x long (less in rusticus)
- black hairs on first segment very long (shorter in rusticus)
- subcallus dark in this specimen (orange in rusticus)
- facial ridge with long black hairs (only pale hairs on rusticus)
- palpus and clypeus with long black hair : really disheveled
- eyes with larger upper facets
- angle between eyes much larger (but not enough for species with angle > 100 (90° here)

Legs :
- front femur with very long black hairs, and only black hairs (shorter and pale in my specimen of rusticus)

Haltere brown

But I think this specimen was in alcohol so maybe the identification is more difficult.
If the tubercle on vertex is always present in Hybomitra (I think so, according to several picture in internet), so it's not Hybomitra. But head is too dark (hairs, eyes, face) for rusticus ?