When fully grown they construct a strong cocoon of chips of wood, bound together by silk, and within this they change to the chrysalis.
The moth emerges in June or July, and is commonly found resting on the bark of willows and poplars during the daytime.
The Leopard Moth (Zeuzera pyrina)
Fig. 121.—The Larva of Pyrina (only partly grown).
The wings of this species are white and semi-transparent, and marked with numerous bluish-black spots in such a way as to remind one of the skin of the leopard. Its body is very long, and
the antennæ of the male are doubly fringed for about half their length from the base.