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Swallow Prominent Pheosia tremula Length 30mm. A well-marked moth that is similar to Lesser Swallow Prominent but separable with care. Rests with its wings held in a tent-like manner. Adult has grey-buff and brown wings; the two or three narrow white stripes running from outer margin of the forewing allow separation from Lesser Swallow Prominent. Double-brooded: flies April-May and again in August. Larva feeds on willows and poplars. Widespread and common in lowland Britain.