I believe this is a Sleepy Orange. It had a bright orange upper side but I couldn't get a picture of it from that angle. It was not one of the cloudy sulfurs that I see a lot of at the house here.
These are two of the many Palamedes Swallowtails that were on my neighbor's flowers. I had not seen one of these before and there were a few there today. I must say that these were taken with my little camera from a third floor porch and the garden was a good 50 feet from the vantage point. I am very pleased with the quality of the shots!
Just one of the swallowtails.