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Lesser Swallow Prominent Pheosia gnoma Length 27mm. A well-marked moth that is similar to Swallow Prominent. Rests with its wings held in a tent-like manner. Adult has pale grey-buff forewings with dark stripes; the distinct white wedge on the outer margin of the forewing allows separation from Swallow Prominent. Double-brooded: flies May–June and again in August. Larva feeds on birches. Widespread and common in lowland Britain.