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Thick-headed Flies (Sicus ferrugineus) on a flower scabious in a wet meadow. Limousin, France. Contrary to what one might think, it's not a mate. During the fifteen minutes where I could observe, the lower one (female?) Was powered by turning on the flower and even managed to fly with the procession to go to another flower scabious. This is probably a prelude to mating.
Their larvae are endoparasites of bumble bees of the genus Bombus. They pupate and overwinter in ther victims.