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An unidentified skipper or skipper butterfly of the family Hesperiidae. "They are named after their quick, darting flight habits. There are more than 3500 recognized species of skippers and they occur worldwide, but with the greatest diversity in the Neotropical regions of Central and South America."http://en.wikipedia.org/wiki/Skipper_%28butterfly%29
Spotted on vegetation along a transect in secondary coastal lowland mixed freshwater swamp forest/sago swamp forest.
Thanks Uday. Wikipedia: "Potanthus is a large genus of skipper butterflies. They are commonly known as Darts. They are found from South Asia to East Asia, and down to maritime Southeast Asia (though NOT extending towards New Guinea)." [my emphasis]. The Papua list of skippers includes just one species of the genus: Potanthus taxilus. I have not found an image of that species. I have to admit the resemblance of this spotting to the images on your link. And as I inferred in http://www.projectnoah.org/spottings/129... this spotting and that one do resemble Potanthus, but given the dearth of information on that genus in New Guinea, I am going to wait for additional information.