Vibidia duodecimguttata

The main colour of the newly hatched larva is transparent grey. The four spots on the first two segments after the pronotum are much larger, compared to the remaining tubercules on the remaining segments. The spots are dark grey, while the abdomen is more elongated even in this instar. The legs are grey exactly like the colour of the body. The tubercular hairs are dark. The head is much darker grey with a light area only in one place between the eyes. The length of the larva is 3.1 mm.

The hatched larva is very opportunistic and moves quickly in exploring the leaf surfaces. The time from hatchling to the first instar is 24 hours.

In the first instar the larva elongates a little and turns slightly yellow. The legs become dark grey, and the pronotum fades. The head is darkened and is almost black. The duration of the first stage is two to eight days.

In the second instar, the body reaches 4.5 mm in length and acquires a brighter yellow colour. On the two segments after the pronotum (above the pairs of spots), there is a yellowish shade. The pairs of black spots are limited in size to some hemispherical oval ones. The pronotum is slightly faded. On the forehead between the eyes there is a single dark spot. The head becomes a lighter dark yellow to pale grey colour. The legs are paler and transparent.

After spending three days as a second instar the larvae become third instars. Early in this stage the larva is around 4 mm long, later in this stage it reaches 7 mm. The body now acquires an overall electric green hue, and the two yellow stripes are still in the form of dots on each abdominal segment. In the middle of the pronotum and on the other two segments after it there are 4 adjacent light squares.

The fourth instar larva is light yellow-beige with a very faint orange tint. The legs are now the same colour as the body. On the dorsal side of the abdomen on the side there are two pale yellow lines, along with three rows of black spots. The two segments after the pronotum have two pairs of black spots and a few vague shadows. The pronotum is mostly electric yellow and only below it are beige spots. The head is dark beige. Fully grown, the larva is about 17 mm long. The fourth instar stage in this species is very short, lasting only 3 days, before the larva enters a prepupal state under the fungus-infected leaves of trees and tall shrubs.

The pupa is pale and creamy yellow in colour. On both sides along the length of the sternites from the fourth to the last there are a number of yellow spots. They do not completely cover the last sixth sternite and only a small gap remains. This species forms its pupae only under leaves infected with powdery mildew.