Cocoon boat-shaped with the keel raised at the head end. When the moth emerges from this end the cocoon closes up tightly again, so that no opening is to be seen; slight pressure on the back will cause the exit slit to open.
This rather local species is perhaps commoner in the eastern counties of England than elsewhere, but it occurs in the oak woods of Berkshire, and southward to Kent and Hampshire. Much scarcer in the west and midlands, and apparently unknown in the north. Barrett gives Galway and Queen's County in Ireland, but adds that it is rare.
Distributed over Central and Southern Europe, and its range extends to South Sweden, and Asia Minor.
SARROTHRIPINÆ.
The Large Marbled Tortrix (Sarrothripa revayana).
This is a most variable species, ranging from greyish white through various shades of brown to blackish; the grey and the
brown forms are sometimes tinged with green. In the illustration some of the more usual forms of marking are shown. 1 (more or less typical) and 2 are the most common; 5 (ramosana) is less frequently met with; 4 (ilicanus) has ashy brown fore wings with a black bar at the base, three black dots on the disc, and a series of black dots before the outer margin, the triangular marking on the front margin is reddish; 3 is a modification of the typical form approaching var. dilutana; 6 is of the afzelianus form, with shiny brownish fore wings and black markings.
Fig. 23.
Large Marbled Tortrix.