145212 Dot Moth Melanchra persicarieae Length 18-20mm. A striking and aptly-named moth. At rest the wings are usually held in a shallow tent-like manner. Adult has blackish forewings with deep bluish marbling, brown flecks and a white kidney spot. Flies July-August. Larva feeds on a wide range of herbaceous plants. Widespread and very common in southern and central Britain.