Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Iberian Marbled White (Melanargia lachesis) is a butterfly species belonging to the family Nymphalidae. It can be found on the Iberian Peninsula and the south of France. The length of the forewings is 25 28 mm. The butterflies fly in one generation from June to August. The larvae feed on various grasses.A butterfly is a mainly day-flying insect of the order Lepidoptera, the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal.