St Mark’s Fly

Bibio marci

Description

Over all length 12 - 14mm. Black-bodied, hairy fly that flies clumsily with legs dangling, the males often in a small cloud above a hedgerow . The male has a dark leading edge to the wing while the females wings are tinted dark.

Habitat

Hedgerows and grasslands where there are damp areas for the larvae to develop in.

Status and distribution

A very common and well distributed species. Regular at the reserve in good numbers.

Best time to see

Late April to early June.

  • St Mark's Fly - Bibio marci - male - April 26th 2012

  • St Mark's Fly - Bibio marci - male - May 1st 2022

  • St Mark's Fly - Bibio marci - male - May 6th 2018

  • St Mark's Fly - Bibio marci - male - May 6th 2018

  • St Mark's Fly - Bibio marci - male - May 6th 2018

  • St Mark's Fly - Bibio marci - female - April 28th 2019

  • St Mark's Fly - Bibio marci - female - April 28th 2019

  • St Mark's Fly - Bibio marci - female - May 17th 2012

  • St Mark's Fly - Bibio marci - female - May 22nd 2013

  • St Mark's Fly - Bibio marci - May 11th 2012

  • St Mark's Fly - Bibio marci - May 7th 2025