Isidore of Seville [7th century CE] (Etymologies, Book 12, 3:): The cricket (gryllus) takes its name from the sound of its call. This animal walks backward, bores through the earth, and chirps at night. It may be caught by tossing an ant tied with a string into its hole, first making a puff of dust so that it doesn’t hide itself. When the cricket grabs the ant, it is drawn out of its hole. - [Barney, Lewis, et. al. translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Worms 9.4): Adlacta [cricket] is of a different color, but it jumps like a locust; its back legs are longer, like a locust. And by these are signified those who, according to the apostle, by no means look forward to the future eternal life, but to transitory present with the longest affections. Adlacta lays eggs, from which offspring come in the spring. And blessed are the works done in the hope of reward only, so that from these they may receive the fruit of eternal salvation. - [Badke translation/paraphrase]

Bartholomaeus Anglicus [13th century CE] (Liber de proprietatibus rerum, Book18.57): Grillos is a little beast, as Cirogrillus is, feeble and mightlesse and théevish, and venimous with prickes and pikes, and is lesser then an Irchin, as the Glose sayeth, super Leuiticum. 40. And hath that name of the sound of his voyce, as Isidore sayeth, libro. 12. This beast goeth backewarde, and saweth and diggeth the Earth, and worketh by nyght, and is hunted with an Ampt ryed with an haire, and throwen into his den: and the pouder is first blowen a waye, least the Ampt hide her selfe therein, and so he is drawne to love of the Ampt, as Isidore sayth. - [Batman]