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Locality: Bergen, Norway
22th July
On the side of a road, zone with gardens
I've found a work about Norwegian horseflies and tried to identify myself http://www.entomologi.no/journals/nje/2014-2/pdf/nje-vol61-no2-219-264-falck.pdf
I interpret that the first antennal segment is short, black, polished and with no constriction
But I'm lost at the point 4 of the key. The dichotomy leads to two paths that are not exclusive of each other:

"4. Antennal segment 1 black, all femora blackish-grey. Abdomen with distinct, but rather small grey sublateral spots on
tergite 3 to 7, sometimes small spots also on tergite 2 .................................................. H. subcylindrica Pandellé, 1883
- Frons always higher than broad, antennal segment 1 not constricted, antennae polished ............................................... 5"

So both paths of the key can be applied to the specimen
Any help? Thanks!

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If your quote it correct, it is a strange key.
Anyhow, green colouration clearly indicates pluvialis.

Theo

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Thanks! If it's pluvialis I misinterpreted one step of the key, as the first antennomere seemed to be not constricted to me, but pluvialis have it :-)

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What can I say ?

Buy the book !

https://www.veldshop.nl/nl/families-of-flies-with-three-pulvilli.html