Identification difficulty = 1.
according to Ball & Morris, 20241
The larva is a scavenger and a predator in nests of bumblebees, where they probably feed on larvae and pupae. The adults are convincing bumblebee mimics, occurring in two main colour forms, one of which mimics red-tailed, the other white-tailed bumblebees. They are often found visiting flowers or resting on sunny vegetation along woodland edges, rides and glades, mature hedgerows or in scrub. This species occurs rather earlier in the season than other members of the genus.
The following plots show the number of unique records per week that were not reported to be of eggs, larvae or pupae.
Widespread and common throughout Britain, including a number of Scottish islands.
The following plots show the Frescalo TFactor vs year and a map of the rescaled frequency (all records) for the species. For an explanation see here.
Ball, S., & Morris, R. (2024). Hoverflies of Britain and Ireland. WILDGuides (3rd ed.). Oxford: Princeton University Press. ↩