The mature larva of Agrotis volubilis Harvey (Lepidoptera: Noctuidae) is described and illustrated. Achillea millefolium L. was found to be an acceptable host. Late instar larvae became more general, accepting Vaccinium vacillans Torr. and Oenothera biennis L. Larvae were fullgrown by the 20th of July (52 days), but would not pupate. They remained healthy through October, when they were placed in out-of-door cages; the larvae failed to overwinter.