Muscina siabulans, also known as housefly, belongs to the genus Muscidae. It is large in size, with two black longitudinal stripes on the chest and back, four black spots on both sides, and the end of the small shield is yellow-brown. The fourth longitudinal pulse bends slightly upward, and the antenna awn branches to the top. China is distributed in other places except Taiwan Province, Guangxi, Guizhou and other provinces, with a large population in Northeast China, North China and Northwest China.