This dome shaped and green colored mass is Green Slug Caterpillar (Eloasa symphonistis), in the family Limacodidae. This slow moving caterpillar feeds on the leaves of Acacia and  some plants in the family Rhamnaceae. They have a number of pale lines running along its body. The caterpillar you see here was feeding on Ziziphus mauritiana leaves.

Here are some pictures of butterflies caterpillar/larvae, I identified and captured so far. These pictures represent a certain larval stage/instar, at a different stage, these will be somehow different.

Plain Tiger Butterfly Larva

Common Leopard Butterfly Larva

Common Emigrant Butterfly Larva

Rounded Pierrot Butterfly Larva

Bath White Butterfly Larva

Lime Butterfly Larva

Large Cabbage White Butterfly Larva

Common Castor Butterfly Larva

Common Grass Yellow Butterfly Larva

Painted Lady Butterfly Larva

Danaid Eggfly Butterfly Larva

Yellow Coster Butterfly Larva

Pictures of unknown moth Larvae/caterpillars from my collection, I captured in the last three years. Until now I didn't get any clue of their identification, so I decided to post them as unidentified, on the hope that someone will be able to help me. Any Identification help would be highly appreciated.

The Striped Pierrot (Tarucus nara) is a small butterfly (wingspan: 24 - 28 mm) found in South Asia that belongs to the Lycaenids or Blues family.

Eggs are laid singly on the young shoots of the host plants Zizyphus sp. It takes 2-3 days for the egg to hatch.

Egg

Egg

The caterpillars of this species feed on Zizyphus sp. and are attended by ants. The caterpillars occur in two colors i.e pale green and dark green. The caterpillar reach a maximum length of about 14 mm. The larva stage last for about 12 days.

Larva

Larva

On maturity the caterpillar stops eating and attache itself to a leaf head down, supported by a silken grid at the center. The pupa has a length of about 8-9mm. Like caterpillars the pupa also occur in two colors i.e pale green and dark green. On the 6th day the pupa turns transparent, revealing the new butterfly inside and after some time the adult butterfly enclosed itself. Before flight, the newly emerged butterfly takes some time to inflating its wings with blood and letting them dry.

Pupa

Pupa

Newly Emerged Butterfly

The Common Grass Yellow or Large Grass Yellow (Eurema hecabe) is a small butterfly (wingspan 35-40 mm) in family Pieridae, found in Pakistan. This species is very common in the Autumn (August, September and October).
The upperside of the wings is bright yellow with the fore wing having broadly black excavated border in the apex and termen and hind wing with narrow irregular border. Underside of both wings is yellow with dark brown markings and irregular shaped rings. The female is large and paler than male.
Their larvae feed on plants in the family Fabaceae, however the main host plants in our area are different species of Sesbania.

Common Grass Yellow Butterfly Male

Female Ovipositing Egg

Common Grass Yellow Butterfly Mating Pair

Common Grass Yellow Butterfly Eggs

Common Grass Yellow Butterfly Egg

Common Grass Yellow Butterfly Caterpillar

Common Grass Yellow Butterfly Caterpillar

Common Grass Yellow Butterfly Pupa

Common Grass Yellow Butterfly Pupa

Newly Emerged Common Grass Yellow Butterfly

Newly Emerged Common Grass Yellow Butterfly