The full-grown caterpillar is 3/4 to 7/8 inch long; basic color is yellow. The body bears pairs of long, horn-like, bristly spines and clumps of smaller spines which are characteristic of several of the slug caterpillars. A useful identifying characteristic is the broad purplish band down the midline of the back. Within the band are narrow whitish longitudinal lines, which may be interrupted by constrictions in the band. Reddish, white, and purple lines occur along the sides.
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