Bill - thank you for the reply- my missing moth is definitely not Orthopygia. The cross-lines were slightly darker than the main wing colour, and the kidney marks were very obvious, like a Straw Dot's.t did have a slight pearly sheen to the wings which might point to a pyralid, but there are no illustrations in Goater which bear any resemblance to this beast. Any other suggestions? Still no sign of it appearing - I suspect it got spidered!!