This moth has a beautiful pale-green ground colour which fades to white within a few days. Distinctive darker green and white stripe running through hindwings and forewings, and added smaller straight line on forewings. Bright-red hooked wingtips. Similar to Swallow-tailed Moth (Ourapteryx sambu) when faded, and Small Emerald (Hemistola chrysoprasaria). Wingspan 30 to 40mm.
The adult flies late May to early August in the south, to September in the north. Maybe even partial extended second generations. Comes to light. It is abundant in broadleaved woodland, and where there are other trees like in parks and gardens, hedgerows and scrub. A common and well-distributed species.
The larva feed on a wide range of broadleaved trees and shrubs, including Hawthorn and Blackthorn.
Photograph taken in July 2013.