@gardencat Thanks Joanne, They are their antenna and they are mainly used as organs of smell or taste. Various different species of insect also have other uses for them as well as smell, such as for touch/ feeling, air motion, heat, or vibration/sound. Quite useful little bits really.
I read that they are also known as fruit flies! Our fruit flies are about the size of a pin head so this is fantastic - unless your fruit flies are 10 times as big!
@scatcat@maggiemae Thank you both, it's not a fruit fly it is too large. It is about 12 mm. It has taken me a while to find it, as its not in my books, but I think it is a Thricops diaphanus.
Anyway, great capture!