Jack Wallington @jackwallington.com · Jun 8 Does anyone have an idea what these tiny flies are? 9 likes 3 replies ? Reply Replies Martin · Jun 8 there is a fly with bulbous eyes and long dangly back legs in the male and it's St Mark’s fly (Bibio marci) and it's pretty common so it might be that? www.woodlandtrust.org.uk/trees-woods-... Charles𖦹Gardener ✹ · Jun 8 Make me think of St Mark’s Fly. A bit late now tho’. But times are strange. Simon Knott · Jun 8 Most likely Fever-fly (Dilophus sp.), bibionid so in same family as St. Marks Fly but much smaller.