Lime Butterfly:
Tell the gender:
a)Tornal spot pattern
Males – tornal spot on upper side hind wing is mostly orange with little blue scale
Females - tornal spot on upper side hind wing is partially orange with more blue scales
b) Ventral hind wing color
Males – underside of hind wing are light yellow in the discal and submarginal region
Females – underside of hind wing is dull yellow in the discal and submarginal region
c) Shape of terminal abdomen segment
Male – sharper abdomen shape
Female – round abdomen shape

On the 5th instar, the caterpillar changes to yellowish green / green in color with no spines, closely resembling the color of its lime host plant. In the middle or 3rd thoracic segment there are 2 lateral false eyespots with a yellowish brown band spanning across the segment. Base on this specimen, the pillar has brown marking on both sides of its body. It is during this latter stage that the larva can die very easily.

The pupae take the colour of either green or brown depending on the surface that it pupate on. Pupating on non-woody or smooth surface usually results in a green pupae while pupating on woody or brown surface gives a brown pupae. The pupa is supported by the silk girdle across the thorax and attachment on cremaster.

links:
https://wiki.nus.edu.sg/display/TAX/Papilio+demoleus+-+The+Lime+Butterfly
https://wiki.nus.edu.sg/display/TAX/Acraea+terpsicore+-+Tawny+Coster

You wouldn’t want to miss that moment if you have the chance.