Graphium weiskei ssp. weiskei
Graphium weiskei, the Purple Spotted Swallowtail, which is found only in the highlands of New Guinea, is a butterfly of the swallowtail family, Papilionidae. These swallowtails live in elevations of 4,500 to 8,000 feet (1,400 to 2,400 m). This one was seen around 6,400 m flying along a stream where it stopped for a few seconds to feed. This is the more rare blue version, the one that is more common is bright pinkish purple where the 2 blue patches near the body are. (See: https://www.projectnoah.org/spottings/20..., 2nd photo) The name honours the collector Emil Weiske.
Beside a stream in the Highlands of West Papua, surrounded by Primary montane rainforest.
Normally I won't touch a butterfly, even to get a photo of the upper wing, but someone else requested the guide to hold this one, and it was so spectacular, I couldn't resist taking a photo. It was only held less than a minute and happily flew away when released. But it still pains me to see it.