《论衡·卷十六·商虫篇》
如果头赤的虫为灾就说是武官造成的，头黑的虫为灾就说是文官造成的，有时为灾的虫或头赤身白，或头黑身黄，或头身都黄，或头身都青，或头身都白得像鱼、肉上生的蛆一样，它们应和哪一类官吏呢？
夫头赤则谓武吏，头黑则谓文吏所致也。时或头赤身白，头黑身黄，或头身皆黄，或头身皆青，或皆白若鱼肉之虫，应何官吏？
If the damaging worm has a red head, it must have been caused by military officials; if the damaging worm has a black head, it must have been caused by civil officials. Sometimes, the damaging worms may have a red head and a white body, or a black head and a yellow body, or a body that is all yellow, or a body that is all greenish blue, or a body that is all white like a maggot that lays its egg on fish or other meat. Which type of official does each of these worms represent?