Harvester
Further along the trail, we spotted this Harvester butterfly (Feniseca tarquinius). They are found in swampy and woodlands areas all along the northeast US and Canada.
Unlike Murray (our monarch butterfly) who has five instars, Harvesters catepillars are hungry larvae and only go through four instars in about 8 days.
The adults feed, on among other things, aphids. This one appears to be a male.