Red-spotted Purple butterflies are a subspecies of the Red-spotted Admiral (Limenitis arthemis). Another subspecies, the White Admiral, is found in northern Ohio but not in our area. Red-spotted Purples are common in and near wooded habitats. They mimic the poisonous Pipevine Swallowtail.
Few butterflies can match the striking blue color of a fresh Red-spotted Purple. This species typically flies from May through September (and I have found a few stragglers into October).
The name "Red-spotted Purple" doesn't make much sense until you see the undersides of these butterflies' wings. The red spots are obvious (although I still don't see the "purple"). Like many woodland species, Red-spotted Purples prefer to feed from tree sap, dung, and rotting fruit, and they are rarely found nectaring at flowers. However, I have occasionally seen them nectaring at buddleia bushes.