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Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012) | Online Photographs: MPG, BugGuide, GBIF, BOLD | Technical Description, Adults: Forbes (1948); McGuffin (1987) | Technical Description, Immature Stages: Forbes (1948); Wagner et al. (2001) | |
| Adult Markings: A medium-sized, grayish-brown Geometrid with fairly broad, falcate forewings and angulate outer margins on both pairs of wings. The head, body and ground color of the wings is fairly dark gray. The wings are transversely striated with fine darker gray lines; the veins are contrastingly pale. Two pale yellow transverse lines run fairly straight across the wing, the second beginning just before the apex. Hindwings are similar in color and pattern. |
| Wingspan: 25-30 mm (Forbes, 1948) |
| Adult ID Requirements: Identifiable from good quality photos of unworn specimens. |
| Immatures and Development: Larvae are smooth, light brown twig mimics, variegated with gray, white and black mottling. Paler triangular or spade-shaped spots occur on the dorsal surface of the second three abdominal segments (see illustration and description in Wagner et al., 2001). |
| Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants. |