MORPHOLOGY
The fore wings: Male. Length forewing/wingspan 37-40/58-59 mm. Forewing, upperside black, pale bluish/greenish spots as follows: complete series of small but conspicuous submarginal spots, series of median spots from hind margin to near apex, lower spots largest and more or less confluent, filling 1/4 to 1/3 of width of wing near hind margin, narrow linear spots in cell and at end cell, basal-most one not continued to hind margin; underside similar, but spots in cell larger and basal-most forming a bar to hind margin.
The hind wings: Hindwing crenulate, no tail; upperside black with well developed submarginal spots, large central pale greenish band from costa to just before tornus, widest at costa, varying there from 1/3 of length costa, separate pale greenish triangular spot at costa between wing base and broad band; underside dark brown, as upperside but submarginal spots larger and with some irregular red median spots, no red spot on vein 8.
The body:
Sex differences: Female. Similar to male, but dark brown rather than black.
Variation and infraspecific taxa: There is some variation in the width and intensity of the color of the pale areas; seven subspecies are recognized, six of which are found in the Malaysian area.
Similar species: See under G. doson.