Eristalis intricaria (Linnaeus, 1758)
Biology & ecology:
The larva is of the ?long-tailed?, aquatic type and occurs in semi-liquid organic matter such as organically enriched mud and waterlogged peat besides ponds and drains, but also in slurry pits and cow-dung. Adults are usually found visiting flowers, especially flowering shrubs, white umbels, Ragwort Senecio and thistles Cirsium, often in the vicinity of trees or scrub. Males can be seen hovering at some height above tracks and in woodland rides. This is a good bumble bee mimic with strong sexual dimorphism.
This is a very widely distributed species that is most frequently found in damper locations. It can be especially abundant in northern and upland environments.
Status & conservation:
There was been a small decline in occurrence until 2000, after which an increase has become apparentNumbers can fluctuate very markedly, however and recent wet years may have contributed to the upturn.