Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Digrammia irrorata is a moth of the Geometridae family. It is found in the western United States and south-western Canada (from Oklahoma to California, north to British Columbia and Alberta).The wingspan is 23 26 mm. Adults are on wing from March to June in the northern part of the range. There are several generations in the south.The larval foodplant is unknown. 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.