Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Diarsia esurialis is a moth of the Noctuidae family. It is found from Alaska and British Columbia, south to Washington, Oregon and California. It is abundant in wet coastal forests. The wingspan is about 33 mm. Adults are on wing in midsummer. The larvae feed on the foliage of Corylus and Alnus.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.