Delias diaphana is a species of pierine butterfly endemic to the Philippines, where it is found only on Mindanao.
D. diaphana Semper. above scarcely distinguishable from descombesi, but beneath entirely black with abnormally large cell-spot on the forewing and similarly large submarginal patches on both wings.Upper surface of the forewing yellowish with black discocellular and black distal margin with yellow spots; hindwing white with whitish submarginal patches. The under surface with broad black postdiscal bands on both wings. A magnificent, large species.
The wingspan is 80âÂÂ90 mm.