Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Eriocrania semipurpurella is a moth of the family Eriocraniidae. It is found in Europe. The species closely resembles Eriocrania sangii.The wingspan is 10-16 mm. The moth flies from March to April depending on the location.The larvae feed on Birch. A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth (about ten times the number of species of butterfly), with thousands of species yet to be described.