Small China Mark
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Cataclysta lemnata
Fairly common around still or slow-moving water throughout Britain and Ireland, mainly nocturnal.
The Larva is dark green or blackish; dorsal line black; head pale brown.
The Larvae are semi-aquatic, feeding on duckweed.
The forewings are white. The costa, discal spot and a series of terminal spots are all fuscous.
The hindwings are white with scattered pale fuscous scales.
Meyrick describes it- The forewings in Male are whitish, with a yellowish-fuscous discal dot, traces of lines, and a pale brownish terminal streak; in Female pale brownish, ochreous-mixed, with a darker discal spot, lines very indistinct, whitish, darker-edged, a whitish siibterminal streak.
The Moth flies from May to August.