Home / Hawk Moths (Sphingidae) / Walnut Sphinx Moth (Amorpha juglandis)

Walnut Sphinx Moth (Amorpha juglandis)

The walnut sphinx moth is a member of the family of the hawk moths. English botanist James Edward Smith first described it in 1797.

Walnut Sphinx Moth

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Scientific Classification


  • Family: Sphingidae
  • Genus: Amorpha
  • Scientific Name: Amorpha juglandis

Description and Identification

Caterpillar

They have a greenish body with white bumps spaced evenly and a pointed head. The larvae mainly feed on walnut besides other plants like butternut, and hazelnut.

They often make a “squeaking” sound by releasing air from their abdominal spiracles as a way to startle predators and scare them off.

Walnut Sphinx Moth Caterpillar

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Pupa

After the caterpillars mature, they begin to pupate.

Adult Moth

Sexual Dimorphism: Present but not prominent.

Color and Appearance

When the wings are opened, either a light or dark brown coloration may be observed, with tinges of pink or white. The patterns running throughout the wings could either appear pronounced or a little faint. When the wings are closed, the color remains unchanged, but the patterns are a little faded.

Average wingspan: 45–75 mm

Flight pattern: Erratic

Season: May to August

Amorpha juglandis

Auth1.dpr.ncparks.gov

Egg

Females lay their eggs close to the host plant, soon after mating. They are big, the shape varying from round to oval.

Quick Facts

DistributionNorth America; primarily Missouri and states east of the Rocky Mountains
HabitatDeciduous woodlands
Lifespan of AdultsNot recorded
Host PlantsAlder, beech, butternut, hazelnut, hickory, hophornbeam, and walnut
Adult DietDoes not feed

Did You Know

  • They are the only species in the genus Amorpha created by German entomologist Jacob Hübner in 1809.
Walnut Sphinx Moth Image

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Walnut Sphinx Moth Picture

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