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The bad news: Siphona are hopelessely difficult and require a lot of experience.
Theo good news: geniculata is by far the most common one and the most easy to recognize.
So always sart with the question “Is it geniculata or not “?

If it checks these
* syntergite 1&2 with strong central marginal bristles
* parafacial relatively broad
* parafacial with a lot of hairs ( > 10)
* third antennal segment shorter


than you have geniculata !

Theo