Appearance
For a key to the terms used, see :Glossary of entomology terms.The length of the forewings is 15–17 mm. Both wings dark brown grey, with the costa of the forewing and the fringes light bright yellow, especially in the female. The ground colour is often more or less lightened with ochreous, sometimes almost clay-colour , or nearly whitish or of an indefinite intermediate shade . In ''pavescens'' Butl. from Hokkaido , the wings are dirty greyish yellow; the hindwing lighter.
Naming
*''Katha deplana deplana''⤷ ''Katha deplana pavescens''
Behavior
The moth flies from June to September depending on the location.Larva dirty lead grey, bearing a yellow dorsal stripe with dark edges and three raised black transverse spots anteriorly, posteriorly and in the centre, and black markings laterally. The larvae feed on lichen and algae, especially on Pinophyta, but also on oak and ''Calluna''. Until June, on lichens on trees. Pupa glossy red brown. The moths singly but not rare, in July and the beginning of August, may especially be beaten from young conifers.
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