"Mentalguy2k8" wrote in message
news:5K_Wn.94783$w51.88115@hurricane...
They're black and smaller than house flies. We're getting a lot in the
garden, they seem to fly/hover aimlessly underneath the washing on the
line (like gnats), but never seem to land on anything.

Same indoors, they congregate in the middle of the room, sometimes a dozen
or two, just moving around underneath the ceiling fan, never seeming to
land on anything. They're coming in through an open door (although an
almost full-lenght curtain is across it, the breeze lifts it at times and
we seriously need the fresh air)

I'll try and get a photo later on, but does anyone have any ideas what
they are, and how to get rid of them? I'm getting tired zapping them with
my electronic fly-swat

Judging by the way they hover(congregate) near your washing, could it be
there is a trace of ammonia in the air from the washed clothes??

In work, we had an ammonia printing machine in the drawing office, and we
notice that having stacked a load of prints to disperse the amonnia fumes,
the pile of prints attracted a huge amount of timy black flies. Eventually
a purpose built exctraction cabinet was constructed to get rid of the
ammonia - problem sloved..

Bill