a Luna moth

'And all of a sudden I remembered once how into a room where I was sitting one night, a big pale apple-green moth, big as a bullbat and soft and silent as a dream'a Luna moth, the name is, and it is a wonderful name'came flying in. Somebody had left the screen door open, and the moth drifted in over the tables and chairs like a big pale-green, silky, live leaf, drifting and dancing along without any word under the electric light where a Luna moth certainly did not belong. The night air coming into the room now was like that.'

'Robert Penn Warren, All the King's Men, 1946.