Papilio lampsacus is a species of swallowtail butterfly from the genus Papilio that is found in west Java, Indonesia[1] where it is only known from the localities of Mt. Gede and Mt Mas.In 1982 it was apparently rather scarce although said to be abundant on Mt Gede.[2]
It is now very rare, and there are few recently confirmed sightings.The last sighting is a picture taken in March 2014.[3]
P. lampsacus is a member of the species group: memnon Jordan describes it P. lampsacus Bdv. (26 b). Two longitudinal lines beneath at each side of the abdomen and a broad discal band on the hindwing, produced at the veins to the distal margin, white-yellow, the anal spot of the band and a narrow basal central streak on the under surface of the hindwing deeper yellow. The female paler than the male, with white-yellow basal patch on the upperside of the forewing. — Java: in the mountains, at 1500—4000 ft. elevation. A mimic of the Aristolochia Papilio P. priapus.[4]