Appearance
For a key to the terms used, see :Glossary of entomology terms.The wingspan is 37–42 mm. The length of the forewings is 17–18 mm.
Whitish green, of the o more or less suffused with grey except along costa, showing a pale curved outer band; fringe white; — in ab. ''immaculata'' Stgr. the whole forewing is uniformly green, with no trace of a white reniform. and the hindwings of the male are not fuscous; — ab. ''thalassina'' ab. nov. [Warren] has the forewing glossy dark sea-green, with the outer half of fringe greenish; the hindwing green flushed with
darker green and the veins green: head and thorax sea green like the forewings; the abdomen white as in typical ''virens'': the description is made from 1 male and 2 females in the Tring Museum, unfortunately without locality label, but probably of German origin; 1 female has a diffuse whitish smear on the discocellular, the others are immaculate: the ab. ''rufata'' ab. nov. [Warren] has the reniform filled up with rufous fuscous or with the white discocellular edged with rufous, and the whole hindwing brownish grey with the fringe white.
Behavior
The moth flies in one generation from late June to September.The larvae feed on various grasses including Purple Moor Grass, ''Stellaria'', ''Plantago''.
References:
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