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Northern Prairie Wildlife Research Center

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Caterpillars of Pacific Northwest
Forests and Woodlands

Pachysphinx occidentalis [Sphingidae]


Head, thorax, and abdomen light green dotted with white; head with converging yellow bands; oblique white band extends from subventral area of A8 to tip of horn on A9; oblique white lines on A1-A7 extend from in front of the spiracle to the dorsum of the adjacent posterior segment; transverse white band at the base of the anal prolegs. This species is common on willow and black cottonwood during July and August.


Return to Photo Key to Species in Group B-1a - Middorsal horn present on A8
Next Section -- Blind Eyed Sphinx

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