Identification
Adult Markings: A medium sized Wave with slightly falcate forewings. The ground color is pale cream, variably tinted with ochre, especially along the costa. The antemedian, median, and postmedian are narrow, ochre lines, running straight across the forewings but all making an outward angle -- especially sharp in the median line -- just below the costa. The discal dots are small and black and the only other markings on the wing are faint subterminal, adterminal, and terminal brown lines (Covell, 1970). None of our other whitish Geometrids have this pattern of bent lines.
Forewing Length: 15.0 - 15.4 mm, males; 11.3 -16.5 mm, females (Covell, 1970)
Adult Structural Features: Male and female reproductive structures are described and illustrated by Covell (1970) and appear to be highly distinctive.
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: A larva illustrated by John Abbott is described by Packard (1876) as "pale flesh-colored, with a red
subdorsal stripe and transverse reddish and plumbeous stripes" (see Covell, 1970). Larvae matching this description and found feeding on Trilium spp. probably represent this species.
Larvae ID Requirements: Identifiable from good quality photos, especially where associated with known host plants.