Found as catepillars feeding on various kinds of Citrus at Tai Tam and North Point, Hong Kong. The males only occur in one form, black. They can be distinguished from the Dark Mormon by red patches near the base of the wings and by the larger size, as well as by the larval foodplant. The females have a tailed and a tailess form. Additionally, in terms of wingspan and in the amount of white on the hindwings, the females can vary considerably. This is the one of the largest butterflies in Hong Kong.
2nd instar larva;
Found on April 15, 2002
length was about 2 cm / 0.75 inch
4th instar larva; 4/22/2002
length was about 4.2 cm / 1.7 inch


Pupation began on April 27 and finished forming two
days later.

female form Achates
Wingspan is about 13 cm / 5.3 inches.

female form Achates
left is top; right is underside
Wingspan is about 11.5 cm / 4.5 inches.

female form Agenor
Wingspan is about 12 cm / 4.7 inches.

Wingspan is about 12 cm / 4.7 inches.
Both top and bottom sides show deep irridescent blue.
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