It lives on the Pacific coast of the United States in Washington, Idaho, Oregon and California.

[3] The green forewings are 22–23 mm long,[3] with pink/purple transverse bands outlined in yellow.

[5] Adults fly in one generation in winter, from December to April, during which they do not eat.

In later instars they lose the horn that characterizes most sphinx moth caterpillars, and instead have a "bullseye" spot.

They will pupate under leaf litter or burrow up to 16.5 cm down into the root mass of their host plants, and wait until next winter to eclose (emerge).