Shown is the Common Green Lacewing (Chrysoperla carnea). Although very common throughout the UK and most of Europe, there are 14 species of similar-looking green Lacewings in the UK.
The Common Green, usually just called Lacewing, is all light green with green-veined wings, but sometimes shows a pale to white central line on the back. It begins to go brown in autumn.
The large eyes are iridescent red and green
The "lace" or feathery veins of the wings
The usual body shape is long, cigar-like and the antennae are nearly as long as the head and body
The Common Green Lacewing hibernates over winter as an adult, so it turns from green to brown for winter camouflage -- usually seeking refuge in buildings.
The brown lace
On the turn to brown and coming indoors
Sometimes the body shape has a waist and curves, tapering to the end; is this the female? (or another species?)
Sometimes the white dorsal line is quite pronounced and the wings veins a more turquoise green
Different species have different courting vibrations and one species won't respond to another, similar-looking species' vibrations.
More turquoise veins
This one has blue iridescence on the wings.