Northern Prairie Wildlife Research Center
Wingspan 3.6 cm. Forewing is pale gray-brown with a curved white band (left photo); ventral surface of the hindwing is reddish-orange with a white median band and discal spots (right photo). This geometrid is common and widely distributed in dry forests and woodlands of western North America. Moths fly in midsummer. Caterpillar host plants are unknown.
Similar species: at least twelve species in the geometrid genera Marmopteryx, Stamnodes, and Stamnoctenis with the ventral surface of the hindwing brightly colored, moths occur in dry forests and woodlands of western North America, however, M. marmorata is distinguished by patterns in the markings on the underside of the hindwing.