1.a. Antenna: 1st segment strongly thickened, greyish haired in the male, black haired in the female. 5-8.5 mm. ->
Symphoromyia crassicornis
Preferred environment: In the Netherlands on chalk grasslands.
Adult habitat and habits: flying and sitting in the vegetation and bare ground.
Flight period: summer.
Range: .
Identification: Van der Goot (1985).
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1.b. Anrenna: 1st segment not thickened in comparison with 2nd and 3trd segment. 4-6 mm. -> Symphoromyia immaculata