About Macaria bisignata Walker, 1866
Macaria bisignata, commonly known as the redheaded inchworm, is a moth species belonging to the family Geometridae. This species can be found across an area ranging from Newfoundland to Georgia, extending west to Arizona and north to Ontario. The wingspan of adult Macaria bisignata is approximately 25 millimetres (0.98 inches). Depending on location, adult moths are active in flight from May to August. The species has a characteristic reddish brown head. Its distinct wing marking features are three or four dark brown marks where the antemedial, medial, and postmedial lines meet the costa, the leading edge of the forewing, plus a larger, subrectangular spot where the subterminal band meets the costa. Another segment of the subterminal band typically remains as a smaller dark spot between the M3 and CuA1 wing veins. Macaria bisignata looks very similar to Psamatodes abydata; Psamatodes abydata lacks the dark brown costa marks that identify Macaria bisignata. The overall ground colour of the wings varies from a light milky tan to a darker gray-brown. The larva of this species feeds almost exclusively on pines, such as Pinus strobus.
