《论衡·卷十六·商虫篇》
鲁宣公时按田亩收税，马上有蝝虫产生，有人说像蝗虫。
鲁宣公履亩而税，应时而有蝝生者，或言若蝗。
During the reign of Duke Xuan of Lu, taxes were levied based on farm land, locusts immediately appeared, someone said they looked like grasshoppers.