''Papilio forbesi'' is a

butterfly Butterflies are insects in the macrolepidopteran clade Rhopalocera from the Order (biology), order Lepidoptera, which also includes moths. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. The ...

of the family

Papilionidae Swallowtail butterflies are large, colorful butterflies in the family Papilionidae, and include over 550 species. Though the majority are tropical, members of the family inhabit every continent except Antarctica. The family includes the larges ...

. It is endemic to

Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...

Description

''P. Forbesi'', Henley Grose Smith, ''Entomologist's Monthly Magazine'', xix., p. 234 (March, 1883);

Forbes ''Forbes'' () is an American business magazine owned by Integrated Whale Media Investments and the Forbes family. Published eight times a year, it features articles on finance, industry, investing, and marketing topics. ''Forbes'' also re ...

, " Naturalist's Wanderings," p. 275 (1885). Upperside. Dark brown, almost black, the margins between the nervures with lunular white spots; very narrow on the anterior wing; much broader on the posterior wing, which is without tails. Anterior wings with longitudinal rays on each side of the nervures, of light brown, extending from the middle to the exterior margin. Posterior wing with a row of three brownish-grey lunular spots between the median

nervule {{Short pages monitor