Spring is finally here. Flowers are blooming and the recent warm weather has brought out the hairy-footed flower bees, the queen bumblebees, an assortment of solitary bees and the bee-fly. The bee-fly Bombylius major is a comical looking insect – a fluffy body, long proboscis and long spindly legs – and can be seen daintily hovering around Warwick Gardens. A bumblebee mimic, they are the one insect that is most enquired about on the East Dulwich Forum… ‘What is it… is it a bee?’ What is that weird looking insect?’. Its a bee-fly.
They have a preference for low growing flowers. In Warwick Gardens they feed on green alkanet, whereas in Peckham Rye Park you will find them enjoying the grape hyacinth in the ornamental garden. Although they are cute-looking their larvae tell another story. They parasitise larvae of solitary wasps and bees. Female bee-flies predate mining bees by dropping their eggs from the air in Dambuster style, or by flicking their eggs into the tunnels of bee nests. Once in the tunnel, the egg hatches and the larvae find their way into the nests to feed on the grubs. Bee-flies are out and about until June, unless they come to an unfortunate end at the jaws of a crab spider!
Great posting. I saw my first B. major in the front garden last year here in S Wales. It was too quick for me to get anything but a few slightly out of focus photos. But when I did some research the thing that fascinated me was the egg laying. The aim must be good, otherwise there must be a high attrition rate.