Bibio johannis

I asked on Twitter what this beastie is called. Very kindly, Ian Beavis (@TWBC_Museum), replied. It is called Bibio johannis and is related to the larger St Mark's Fly, Bibio marci which flies later in the year.

Apparently St Mark's Fly is so called because it swarms at around the time of St Mark's Day, 25 April. Bibio johannis is known as the Black Gnat by anglers, it seems.

I spotted this one on an early piece of Wild Cherry blossom that got blown off the tree almost as soon as it opened on 8 April.