Waved Sphinx Moth

The waved sphinx moth is a large hawk moth of the family Sphingidae, widespread across eastern and central North America. It is named for the series of fine, undulating dark lines that cross its otherwise plain gray-brown forewings, a subtle pattern that gives outstanding camouflage against bark and dry leaves.

As a member of the sphinx moth family, it shares the group's characteristic robust, torpedo-shaped body and powerful, direct flight, though it is generally more muted in color than some of its more boldly marked relatives. Its caterpillars feed on the foliage of trees such as ash, privet, and other related woody plants, tying the species closely to deciduous forest and landscaped tree habitats.

The waved sphinx moth is ecologically significant as both a nectar-feeding pollinator in its adult stage and a folivore in its larval stage, contributing to nutrient cycling in forest and orchard ecosystems while also serving as prey for birds and bats.

• Forewings are pale gray to brownish-gray, crossed by numerous fine, wavy, dark lines running roughly parallel to the wing margin.
• Outer edge of the forewing often appears slightly scalloped or notched rather than perfectly smooth.
• Hindwings are plainer, generally pale gray-brown with faint darker banding.
• Body is thick and tapered, typical of sphinx moths, with a pointed abdomen and swept-back wing posture at rest.
• Lookalikes include other Ceratomia species and gray-toned sphinx moths; the dense network of fine wavy lines across the forewing is the best distinguishing feature.

Found throughout much of the eastern and central United States and adjacent Canada in deciduous woodlands, orchards, hedgerows, and suburban areas with host trees such as ash, privet, and lilac. Adults are active at night from late spring through summer and are attracted to lights, while caterpillars feed on foliage from summer into early fall.

Adults are strictly nocturnal, resting motionless on tree trunks or fences by day where their bark-like pattern provides camouflage, and becoming active fliers after dark to feed on nectar from tubular flowers using their long proboscis. Caterpillars are solitary leaf-feeders that rest along leaf midribs or stems during the day, relying on cryptic green coloring and a posture that breaks up their outline. Both stages contribute to the food web, with caterpillars in particular being an important food source for nesting birds.

Eggs are laid singly on host tree leaves. Caterpillars grow through several instars, developing diagonal side stripes and a curved posterior horn typical of sphinx moth larvae, before dropping to the ground and burrowing into soil to pupate in an underground chamber. The pupa overwinters below ground, and adults emerge the following late spring to early summer, with generally one generation per year in the northern part of its range and potentially a partial second generation farther south.