Halesus imago , known as Night Caperer. Adults can be seen on the wing from mid August until the end of November. According this photo many fly tiers have tied remarkable realistic patterns for the World Tuscany Open fly tying competition 2007.
Baetis rhodany nymph can reach size between 6 and 11mm (body only), upper on the photo is small Plechoptera nymph just 1mm length.
A spider rides an ant.