Thumatha senex

Thumatha senex, the round-winged muslin, is a moth of the family Erebidae. It is found in northern and central Europe, the Alps, northern Asia Minor, the Crimea and south-western Siberia.

Technical description and variation

The wingspan is 15–20 mm. Not unlike Nudaria mundana. The central spot at the apex of the cell distinct; a larger shadowy spot at the middle of the costa, and before the marginal area of the forewing a row of spots which are especially distinct in the costal region. Another curved row of spots bounds the basal third of the forewing.
Image:Buckler W The larvæ of the British [butterflies and moths PlateXLIII.jpg|thumb|140px|left|Figs. 2, 2a, 2b, 2c, 2d larvae after last moult 2 e cocoon or pupa case
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Biology

Adults are on wing from mid-June to mid-August in one generation.
Egg round, yellow. Larva ashy grey, very hairy, with black head. The larvae feed on lichen and mosses. Pupa stumpy, dark brown, in a dense hairy cocoon.
The moths fly on damp meadows, and are not rare in their flight-places; they come to the light at night.