Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Euxoa castanea is a moth of the Noctuidae family. It is found from the North Dakota, South Dakota and south-western Manitoba west to central western British Columbia, north to the Northwest Territories and south in the mountains to Arizona and New Mexico. The wingspan is 35 38 mm. Adults are on wing from 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.