Walnut caterpillar

Datana integerrima

Pale, green eggs with white caps are deposited in clusters of 120 to 880 on the lower leaflet surfaces. The eggs are spherical and about 0.7 millimeters (0.03 in) high and 0.5 millimeters (0.02 in) in diameter. As the embryo develops, egg color changes to light blue-gray.
A newly hatched larva is light green but changes to reddish brown as it grows older. Short white hairs cover most of the body. White lines on the top and sides extend the length of the body. A fully grown larva is black, covered with long white hairs, and 2.5 to 5.0 centimeters (1 to 2 in) long. The head color in all stages is black.
The pupa is about 2.0 centimeters (0.75 in) long, shiny and dark reddish brown.
The moth has a wing expanse of 4.2 to 4.8 centimeters (1.6 to 1.9 in). Each forewing is dark tan with four rust-colored lines. The hindwings are light tan.

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