Poisonous moth family; Grass moth, LEPIDOPTERA 1 family. Medium-sized moth with undeveloped beak, no eye, four copper veins on the front wing, poisonous hairs on the larvae and inverted glands. Undergraduate insects are generally called poisonous moths. It is an important pest in agriculture, forestry and animal husbandry. About 2700 species are known in the world, and about 360 species in China. Most species in China are distributed in the south of the Yangtze River, with the most species in southwest and south China and less in northwest China.