Palloptera muliebris (female) by Martin Cooper
(CC BY 2.0)
Steven Falk has produced an identification guide to Pallopteridae
Introducing flutter flies (Pallopteridae), a small family (13 British species) of some very attractive wing-waving. picture-winged flies, most of which are fairly easy to record. I’ve provides a wing chart and a scan of Alan Stubb’s 1994 key.