It takes about half a year for the third instar to pupate, and the pupa takes three weeks to turn into an adult. The larvae of the rhinopterus are commonly known as "grubs" and "chicken worms". They have a fat body and can reach a maximum length of about 10cm. The head is hard and densely dotted, with the front side being black and the edges being reddish brown;

Chewing mouthparts with powerful jaws; only traces of the degeneration of the single eye remain. The rest of the body is relatively soft, often C-shaped, milky white or beige, with a translucent body surface. Dark contents in the digestive tract can be seen at the end of the abdomen, and movement mainly depends on body peristalsis.

Female larvae are smaller than males. The peak weight of female larvae is generally 20-30g, while the male larvae can reach 30-50g, or even heavier. In addition, at the L3 stage, a V-shaped dot can be seen in the center of the penultimate segment of the abdomen of male larvae, while female larvae do not have this feature.

Extended information:

The optimal temperature for larvae is 23-25℃. At this temperature, they eat most actively and grow best. Although they can tolerate high temperatures of 30℃, they will be harmful to Growth is adversely affected; food intake is reduced below 20°C and growth is slow;

It enters a dormant state below 10°C, basically does not eat, and weight will decrease; it can tolerate low temperatures around 0°C for a short period of time, but lower than -2℃ will cause death.

The natural enemies of larvae are mainly digging predators such as moles and badgers, as well as carnivorous larvae such as beetles and wasps, which are also easily parasitized and killed by fungi.