"Book of Rhymes (Jiyun)" uses the characters "zhi" and "lie" for fanqie, pronounced "zhe" (falling tone). It refers to the larvae of moths and butterflies. "Jade Lexicon" (Yupian) explains it as locusts. Furthermore, "Guangyun" and "Book of Rhymes" (Jiyun) use the characters "zheng" and "li" for fanqie, pronounced "zhi" (falling tone). This refers to the larvae of locusts. Note: "Explanations of Characters" (Shuowen Jiezi) explains that "huang" (locust) is the same as "zhong" (a type of locust). Moths and butterflies are insects that eat the leaves of grain. Locusts and moths/butterflies are both pests that eat grain seedlings. Now, the pronunciations and definitions from "Book of Rhymes" (Jiyun) are listed separately. However, "Jade Lexicon" (Yupian) uses the fanqie "zhi" and "lie", and its definition is intertwined with that of "Book of Rhymes" (Jiyun). Therefore, it seems unnecessary to be overly rigid about these distinctions.