is a rounder-winged form with the first lines strongly approximated and said to be the product of under-feeding the larvae.

Hybrid fletcheri Tutt (pusaria male x exanthemata female) is just intermediate between the parent forms, rather pure white, the lines tinged with ochreous.

It feeds on various trees and shrubs including alder, aspen, birch, oak, rowan and willow.

The moth is now placed in the genus Cabera, which was raised by the German lepidopterist, Georg Friedrich Treitschke in 1825.

Cabera refers to Cabeiro, the daughter of Proteus ″the prophetic old man of the sea who kept changing his shape to avoid being caught and having to make prophesies″.