The Papilio memnon agenor f. alcanor is interesting. According to Pinratana, this form is similar to f. distantianus, but "the white area is restricted and not, or only just, entering into the cell". Ek-Amnuay does not provide a description, but shows a specimen with hardly any white at all, only 4 small oblong spots. The photo here shows the opposite, with considerably more extensive white than f. distantanius.