St Mark's flies, Bibio marci, yesterday on Chailey Common

 Suddenly and briefly for a week or so there are lots of little black flies everywhere in the countryside.  Here in East Sussex.

 Full info' on these flies at https://www.buglife.org.uk/bugs/bug-directory/st-marks-fly/?fbclid=IwAR3tCwE1XDCkyMGqzbQ_ScZxAp8xw5iAbGP9lbhBLdtZGtB9VAmBuN9QaDA

Click on any picture to enlarge it.

 Their sole purpose in their brief flight period is to mate, for the female to lay eggs in the soil and then die.

 Here is a mating pair.