With warm gray-brown forewings etched with an unusual pattern of white arcs and squiggly compound lines, this moth is very distinctive. Apparently it can not be confused with any other species in the Pacific Northwest. In our area it is on the wing from late spring to summer in mixed hardwood-conifer forests. Caterpillars are specialists who prefer leaves of birch and Rubus species in the rose family. There are two generations per year throughout their range, from southern Canada and the northern US, south in the west to Arizona.
Photo by Megan Robson on 7/20/20 in Missoula, MT.