Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Marbled Underwing (Catocala marmorata) is a moth of the Noctuidae family. It is found from Vermont to South Carolina and west to Indiana and Illinois. The wingspan is 85-95 mm. Adults are on wing from July to September depending on the location. There is probably one generation per year. The larvae feed on Populus and Salix species. 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.