Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Scarce Heath (Coenonympha hero) is a butterfly species belonging to the family Nymphalidae. It can be found in Central Europe, Northern Europe and Asia. It resembles Coenonympha arcania. Coenonympha hero gliwa.jpg Illustration from John Curtis's British Entomology Volume 5 The butterflies fly in one generation from May to July.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.