Little Yellow (a.k.a. Little Sulfur; Pyrisitia lisa or Eurema lisa) - The Orange Trail, The Great Swamp National Wildlife Refuge Wilderness Area, New Jersey
At first I thought this was an Orange Sulfur, but then thought, "Wait a minute, that's way too small". It flew down the trail in front of me for several minutes before tiring and resting in the grass along the trail on a low perch. I set up my tripod and sat there for 10 or 15 minutes making captures when lulls in the breeze allowed for the slow shutter speeds needed for detailed captures.
300 mm F4, 60 mm X-tubes with a 1.4X TC