Falcate Orangetip. This one is female, so it lacks the "orange tips" but I've seen a few males flit by.
Henry's Elfin. They appear about the same time as the Spring Azures, and disappear by May. They seem to like the Hemlock trees, and occasionally the apple. They are harder to see and photograph, as they blend in to the brown and green foliage. They also try to chase the Azures away from the trees.