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Narcissus Bulb Fly

Narcissus Bulb Fly ©Penny Frith

Narcissus bulb fly

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Scientific name: Merodon equestris
With ginger hairs, dark banding and a cream tail, the Narcissus bulb fly looks like a bumble bee, but is harmless to us. This mimicry helps to protect it from predators while it searches for nectar in gardens.

Top facts

Stats

Length: 1.0-1.5cm

Conservation status

Common.

When to see

March to August

About

A common medium-sized hoverfly, often found in gardens, the Narcissus bulb fly (also known as the 'Large narcissus fly' and 'Greater Bulb Fly') is a bumble bee mimic. Adults feed on nectar and pollen and can be seen around flowers like dandelions from March to August. Males can be spotted flying low over short grass in search of females; while females can be seen on the dying leaves of bulbous plants, such as Daffodils and Bluebells, where they lay their eggs. The larvae hatch and burrow into the bulb underground, feeding on it and even destroying it.

What to look for

Covered in ginger hairs, with a black band around the middle, and a creamy tail, the Narcissus Bulb Fly is one of several species of hoverfly that mimic bumble bees.

Where to find

Widespread.

Did you know?

The patterns and hair colour of the Narcissus bulb fly vary in different individuals to mimic different bumble bee species. Mimicking something much less palatable, such as a bumble bee, is a form of defence against predation.