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Can anyone confirm my identification of this Thick-headed fly as Conops quadrifasciata and is it known which bumblebee species it targets?

It was photographed on Sept 5th 2010 in a Wiltshire garden close to a red-tailed bumblebee nest (Bombus lapidarius) though several other bumblebee species use the same garden. I also photographed another conopid: Sicus ferrugineus nearby in July.


NickU Generalist naturalist and photographer