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Hi Theo,

Are there no other means of distinguishing B. selecta and B. parallela other than presence of discals on T3, T4 ( selecta) and the host ( Symphyta for selecta, Microlepidoptera for parallela)?

I have 2 specimens of Bessa from here in Suffolk. One is certainly selecta
(http://www.dipter...d_id=40319 )
but the other has discals on T4 but not T3.
(Sand Dunes are a few km away, so dune type diptera turn up from time to time, eg Villa modesta ).

regards,
Steve