Thumatha senex, the round-winged muslin, is a moth of the family Erebidae.
Another curved row of spots bounds the basal third of the forewing.
Larva ashy grey, very hairy, with black head.
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.