These have to be the most amazing flies I have ever seen and very difficult to photograph so excuse the bad pictures but at least they will give you an idea of what they look like.
Their eyes are the red bulbs at the ends of the stalks protruding from its head!! Amazing!! Well to me anyway.
They are very small with clear wings of only 6mm and are found in warmer forested areas.
Info: Field Guide to Insects of South Africa