For a key to the terms used, see Glossary of entomology terms. The species has pale and dark morphs in Australia. The development of these forms has been linked to photoperiod and temperature during growth. For the fore wing, the whole, or sometimes only the apical half, of the costa narrowly black, this color widened out irregularly at the apex; termen widely black at the apex, the colour narrowed posteriorly. This border in some specimens almost reaches the tornus, in others terminates above vein 4; occasionally it is continued posteriorly by a series of block dots at the apices of the veins. Hind wing: generally uniform, unmarked, some specimens bear minute black dots at the apices of the veins.
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The most widespread members of the genus are pomona and pyranthe, both of which are found from India and Sri Lanka to Malaysia, east to the Philippines, and south through Borneo, Sulawesi, Java, Bali, Timor and New Guinea, to northern Australia. These include Cassia, Ormocapum and Senna Fabaceae. The fully grown caterpillar is pale green with a whitish lateral stripe. It is extremely well camouflaged as it rests along the midrib of a leaf. Pupation takes place away from the foodplant, on the stems of nearby bushes, or on tree trunks, fences or buildings.
Both sexes commonly visit flowers including Lantana and Catunaregam. The spines on the legs of female butterflies are used to pierce the surface of leaves, thereby releasing tiny quantities of chemicals which they can recognise to identify their foodplants.
Each time this particular female located a Cassia or Ormocapum plant she very quickly deposit a single egg, or sometimes more, before moving on to the next plant. Her egg-laying run lasted for just under 5 minutes, during which time she deposited a total of 14 eggs.
She then decided enough was enough, and retired to hide among the foliage of a nearby bush, where she remained stationary for about half an hour before flying off in search of another suitable plant.
Catopsilia pomona pomona