THE HIDDEN SCENTS OF SUMMER
Using pheromones to attract a mate.
A number of other British butterflies have similar sex scales. In some species they are woven into the patchwork of scales that cover the entire surface of the wing, while in others, like the silver-washed fritillary, there are very obvious concentrated androconial patches. Look out for the dark smudges on the forewing of the male gatekeeper, the thick bold lines on the wings of members of the skipper family ( pictured), and the dark suffusion on the wings of the male grayling – another butterfly famous for its dance.