There are three forms found in the British Isles:
- E. innotata sensu stricto (angle-barred pug) is found only on the east and south-east coasts
- f. fraxinata (ash pug) is widely distributed
- rare f. tamarisciata (tamarisk pug)
The forewings are generally dark brown or grey with few distinguishing marks apart from a small white tornal spot which may not be present on the frequent melanic forms. The wingspan is 18–24 mm. Two broods are produced each year with the adults flying in May and June and again in August. Moths of the spring brood are usually darker in colour than the later specimens.
- f. fraxinata feeding on ash
- E. innotata sensu stricto feeding on sea-buckthorn
- f. tamarisciata is found on the alien food-plant tamarisk
The species overwinters as a pupa.
- Chinery, Michael Collins Guide to the Insects of Britain and Western Europe 1986 (Reprinted 1991)
- Skinner, Bernard Colour Identification Guide to the Moths of the British Isles 1984
- Waring, Paul, Martin Townsend and Richard Lewington (2003) Field Guide to the Moths of Great Britain and Ireland. British Wildlife Publishing, Hook, UK. ISBN 0-9531399-1-3.
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