Posted by Jessica on 26-07-2020 08:57
#3
Okay, thank you.
I used this key to arrive at
guttiventris : http://www.robberflies.info/keyger/htmle/key.html
But according to Fauna Europaea, there are two species in France that are not in the key :
Leptogaster nitida and
Leptogaster pumila. I can't find anything on them.