Expanse of wings one and one-fourth inches. Length of body sixtenths of an inch. Head and antennæ black. Thorax, above black bordered with white, beneath white. Legs white. Wings white, satiny, translucent. Primaries have a slight tinge of yellow. On the costa, near the middle, are two black or drk brown blotches; below these, towards the inner margin, are two other blotches, sometimes united—the whole forming a broken, transverse band.