Hi Diana, I think this is Macaria bicolorata, and not bisignata. Unfortunately, the best mark to tell that species is the color on the underside of the wings, which is bright orange in this species (white and orange in bisignata). The ground color is a purplish gray in bicolorata (off white in bisignata) and that matches what your photo shows. One must also rule out transitaria, but your specimen doesn't show enough brown in the FW to indicate that species. Hugh On Thu, May 12, 2011 at 1:45 AM, Diana Stock-Prescott < diana.stockprescott@xxxxxxx> wrote: > 06342 Red-headed Inchworm.... I think > > Diana Stock -Prescott > Knox Co, TN > > > > >