《太平广记·卷四百七十七·昆虫五》
南方山间水沟里有很多水蛆，长有一寸多，颜色是黑的，夏天体色加深，变成虻，螫人很厉害。
水蛆，南中水溪涧中多此虫，长寸余，色黑。夏深，变为虻，螫人甚毒。
There are many water larvae in the mountain ditches in the south, which are over one centimeter long, black in color, and turn into虻 (Horseflies) in summer and have a strong sting.