The most reliable characteristics to identify the sex of silkworm babies are the eighth and ninth abdominal nodes: there are four transparent dots on the ventral surface of the eighth and ninth abdominal nodes of female silkworms; There is a transparent point in the center of the ventral surface of the ninth section of the male silkworm.
Identifying the characteristics of male and female pupae is also based on the structure of the eighth and ninth abdomen. There is a straight line in the center of the ventral surface of the eighth and ninth sections of the female pupa, which separates the eighth and ninth sections; The male pupa has a pair of small protrusions in the center of the ninth ventral surface of the abdomen.
As for the difference between male and female moths, apart from distinguishing the characteristics of tentacles and abdominal size, the most reliable thing is to distinguish the external genitalia of male and female moths. For example, there is a black bone plate near the mating hole of female moths, and the male moths have paired claws.
The picture is not very clear. According to the above, please identify for yourself.