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male - 6.3mm - Berlin - May 2018

I am hoping that someone can confirm at least the genus Pipizella.

I don't have keys for many Syrphidae. I also request any tips of where to find keys.

I usually just glance at photos and try to memorize appearance/morphology. I thought it was Cheilosia until i looked at it a bit closer. I quickly browsed the gallery and this looks very similar to Pipizella viduata.
https://diptera.i...to_id=4312

I can match genitalia if someone can provide drawings. I see that nine Pipizella are recorded for Germany, four of which are recorded for Berlin (according to the Entomologische Gesellschaft Berlin).

I have read about Speight but i cannot find pdf files. Anyone able to help? I would like keys to genera, keys to Cheilosia especially.

Thank you for your time,
John