Elytral polymorphism in spittlebugs: Philaenus spumarius (L.) from the Inner Hebrides

The frequencies of colour and pattern morphs of the elytra of Philaenus spumarius are similar on three of the Small Isles of the Inner Hebrides (Eigg, Canna and Muck); the population on the fourth island (Rhum: is somewhat distinct but is like that at sea level on the nearby mountainous mainland. These similarities and differences suggest that these morph frequencies are regulated by natural selection.