Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Euxoa clausa is a moth of the Noctuidae family. It is known mainly from the north-western Great Plains in southern Saskatchewan and Alberta, south to south-western Montana and Nebraska.The wingspan is about 33 mm. Adults are on wing in July to August. There is one generation per year.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