10 Microsecond challenge.

Just to annoy Terry Wogan ... There we were, sat sitting over the day's first cuppa and idly gazing out onto the front lawn.
Behold. An entire squadron of hover flies, homing in on one of my famous weeds. They, more or less, lined up and zoomed in ... Kindly waiting for me to locate and grab the weapon.
Got outside in hope, rather than dispair.

Dis pair???, Dat pair??? There were two and a half pairs, can you see them all?

No prizes.