The moths of the family Aegeriidae, the so-called clearwings ("Glass-fluger"), are normally easily recognized by the general habitus, the narrow, mostly hyaline wings, and the dilated antennae, tufted at the tips, although these antennal characters do not hold for some of the genera (Bembecia, Zenodoxus). The family contains more than a dozen American species of considerable economic importance, these being known to the orchardist, gardener, and forester under the names of peachtree borer, persimmon borer, strawberry crown moth, grapevne root borer, maple bark borer, ash tree borer, hornet moth, squash borer, etc. As a group these moths have for some time stood in need of the revision and nomenclatural clarification that this work supplies.