《太平广记·卷四百五十六·蛇一》
还有黄喉蛇，喜欢呆在屋子上；没有毒，也不害人，只善于吃毒蛇。吃饱了，把头直垂下去，嘴里溅出沫子，把泥土都喷起来，变成沙虱，沾到人身上，人就得病。
有黄喉蛇，好在舍上，无毒，不害人，唯善食毒蛇，食饱，垂头直下，滴沫，地喷起，变为沙虱。中人为疾。
And in yellow-throated snakes, like staying in the house; no poison, no harm to people, only good at eating venomous snakes. After eating, put the head hanging straight down, splash the saliva in the mouth, and spray up the soil, turning into sand lice, and when they get on people, people get sick.