The scalloped hazel (Odontopera bidentata) is a moth of the family Geometridae. The species was first described by Carl Alexander Clerck in 1759. Distribution It is a common species of northern and central Europe including the British Isles and Russia to the Urals. It is also widespread through Siberia and the Amur-Ussuri region to the Kuril Islands and Japan. Description The wingspan is 46–50 mm. The forewing ground colour is usually grey brown. The same coloured midfield is bordered by blackish crossbars that are often partly white. At the wing edge below the apex are two characteristic, protruding teeth. The scientific name of the species is derived from the Latin language bi = "twice" and dentatus = "toothed". The outer dark crossline of the forewings continues on the hindwings. All wings have a ring-shaped dark discal spots. The thorax is hairy. This is a very variable species with the wing colour ranging from whitish through buff and brown to black, sometimes with variegation, but it is always easily identifiable by the white discal spot on each wing and the characteristic "ragged" margin of the wings. Last instar caterpillars have a brownish colouration. However, other colour variations may also occur. Characteristic are two small humps on the penultimate segment as well as two dark, capsule-like protrusions on the head. The adults fly at night in May and June and are attracted to light. The caterpillar is green or brown and twig like, and feeds on a variety of plants (see list below). The species overwinters as a pupa. The flight season refers to the British Isles. This may vary in other parts of the range. Biology Habitats include deciduous and mixed woodland, bog forests and parklands. Larval food plants Alnus – grey alder Arctium – burdock Artemisia – mugwort Betula – birch Cirsium – creeping thistle Crataegus – hawthorn Fraxinus – European ash Hedera – ivy Larix – larch Ligustrum – privet Malus – apple Picea – Norway spruce Pinus – Scots pine Populus – poplar Prunus – bird cherry Quercus – oak Rhododendron Ribes – currant Salix – willow Sorbus – rowan Tilia – lime Trifolium – red clover Vaccinium – bilberry Subspecies Odontopera bidentata bidentata (Clerck, 1759) (Europe) Odontopera bidentata exsul Tschetverikov, 1904 (eastern Asia) Odontopera bidentata kurilana Bryk, 1942 (the Kuriles) References Chinery, Michael (1986, reprinted 1991). Collins Guide to the Insects of Britain and Western Europe. Skinner,