Northern Prairie Wildlife Research Center
Green with 6 prominent stripes; those below spiracles broader, whiter, and occasionally interrupted. Dorsum, spiracular areas, and prolegs may be marked with wine red patches. Head triangular, front often rusty, and with yellow line running from antenna to crown. Horn absent. Caterpillars of more-southerly pine sphinx (L. coniferarum) closely similar. Food: pines. Caterpillar: August to September; 1 generation.