Orange-barred Sulphur (Phoebis philea)

I have seen an Orange-barred Sulphur in Caddo Parish only once.  It was in my back yard nectaring first on Tithonia and then Lantana.  I attempted to photograph it, but unsuccessfully.  I know that this individual was a male because I saw the orange bar on the dorsal side as it flew away.  This butterfly stopped in my yard for sustenance for about 30 seconds and moved on.  It was on a mission to get somewhere.