Northern Prairie Wildlife Research Center
Wingspan 2.4 cm. Forewing is mostly black with a curved white median band and a black discal spot. This geometrid is common and widely distributed in western North America. Moths fly during the day in early spring. Caterpillars feed on the foliage of hazelnut (Corylus cornuta).
Similar species: Mesoleuca ruficillata is larger, forewing with the white median band relatively straight, uncommon but widely distributed in North America, moths fly in midsummer, caterpillars feed on the foliage of birch (Betula).