Pupa molts and becomes an adult after one week at above 25℃. Adults have just molted and their shells are very thin. After 10 hours, it becomes tan, dark brown, shiny, oval, about 14 mm long and 6 mm wide, and the shell becomes thick and hard. At this time, it is fully mature. After mating and spawning, the second generation reproduction is carried out. Worms are divided into three parts: head, chest and abdomen. The adult head has a pair of tentacles more than the larval head, which is five times as long as the larval face. There are three pairs of feet, one in the chest and one in the abdomen. The length of the foot is 8 to 10 times that of the larva. There are two claws on each toe, and there are bristles on the toes. There are several vertical stripes on the back wing. Although adults have a pair of beautiful wings, they can only fly short distances. Wings protect their bodies on the one hand, and help them crawl on the other.