The appearance of the locust is characterized as follows:

1. The body is slightly flattened, and at first glance looks like a cylinder, with a length of about 2 to 15 centimetres, and a width of about 2 millimetres to 1.5 centimetres.

2. The dorsal surface is greenish-black with 5 yellow longitudinal lines, the ventral surface is flat, grayish-green, without miscellaneous color spots, the overall ring pattern is remarkable, the body segments are composed of 5 rings, and the width of each ring is similar.

3. 10 eyes, arranged in ∩ shape, 3 semicircular jaws in the mouth surrounded by a Y shape, when sucking on the animal body, use this jaws to drill into the skin, the body is large, the body length of 60-120mm, width of 13-14mm.

4. Dorsal surface of the body is dark green with 5 longitudinal lines, sucking up the blood, from the pharynx through the oesophagus and stored throughout the alimentary canal and the blind sac. Excretory pores are present in all segments of the body, opening ventrally. Male and female genital pores are 4 rings apart, each opening between rings. The anterior sucker is more readily visible, the posterior sucker is more conspicuous and strongly adsorbed.

Locust distribution:

Leeches, commonly known as leeches, it is in the history of natural fishing-based, because of pesticides, fertilizers and other abuses in recent years, and agriculture and industry, "three wastes" pollution of the environment, wild natural resources declined sharply, along with the depth of the medicinal value of leeches.

With the development of leech medicinal value in depth, its market demand potential is huge.

Leeches, also known as medical leeches, commonly known as water locusts, are distributed all over the world, *** there are more than 300 species, more than 100 species in China. There are more than 300 kinds of leeches around the world, and there are more than 100 kinds of leeches in China. They can be found in lakes, ponds and paddy fields in most parts of China.

Mainly produced in Shandong Weishan, Dongping, Nanyang Lake and other lakes, Weishan Lake production is the largest, in addition to the supply of the province, and sales in the northeast, Hebei, Shanxi. Jiangsu Suzhou suburbs, Wu County and other places produced also exported part. In addition, Zhejiang, Anhui, Hunan, Hubei, Sichuan, Shaanxi, Hebei, Liaoning, Jilin, Heilongjiang and other places are also produced, are self-produced.