Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Mournful Underwing (Catocala flebilis) is a moth of the Noctuidae family. It is found from Massachusetts and Connecticut south to North Carolina and Georgia, west to Arkansas and north to Michigan and Illinois and into southern Ontario. The wingspan is 45-65 mm. Adults are on wing from July to September depending on the location. The larvae feed on Carya glabra and Carya ovata. A moth is an insect closely related to the butterfly, both being of the order Lepidoptera.