User vbell1123 submitted a great 24-species checklist from the National Butterfly Center in Texas, including this pair of sisters: The Spot-celled Sister (Adelpha basiloides) and the Band-celled Sister (Adelpha fessonia).
Can you spot their differences?
https://www.e-butterfly.org/ebapp/en/checklists/view/121551
Submit all your observations to www.e-butterfly.org