"Found during daylight on a large poison ivy leaf. Additional info based upon community ID: ""Covell's Guide (2) gives ""locust trees"" as the larval foodplant but doesn't specify whether that means Gleditsia species or Robinia species - or both. Larry Line states that larvae feed on Honeylocust (Gleditsia triacanthos)"" - http://bugguide.net/node/view/73886 - PLENTY of black locust trees in the area, here!"