The imagoes, or adults, are small, diurnal moths that resemble bumblebees in shape. Adults, the imagoes, have a lifespan of only 15 to 20 days. Male imagoes were 5.2 millimeters, while females measured 5.0 millimeters. The adult moths, or imagoes, emerge about two weeks later. In the US the imagoes emerge from their cocoons in June to early September.