Bibio marci (Linnaeus, 1758)
A very common fly, often found in large numbers around Hawthorn. The Hawthorn Fly is one of Bibio marci's common names, but it is often known as the St Mark's Fly due to emerging around April 25th each year. Their flight is sluggish and they frequently rest on foliage. They are on the wing from April through to June and frequent hedgerows and woodlands.
Nottinghamshire (VC56) distribution of Bibio marci
The records for the Nottinghamshire distribution map are currently provided by the following contributors - Richard Rogers. Nottinghamshire Wildlife Trust. Tim Sexton. Trevor and Dilys Pendleton. Netherfield Wildlife Group. Meg Skinner. Wil Heeney. Sherwood Forest Invertebrate Directory 2014. Stuart Warrington. The National Trust (Clumber Park invertebrate records). Allan and Annette Binding (Clumber Park invertebrate records). Pauline Bradford.

You can contribute your own records to help us gain an accurate status of this species in Nottinghamshire. Send an Excel spreadsheet of your records via the 'contact us' link at the top of the homepage.

Updated January 2021

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