Note 3 — Chapter II · THE CICADA: LEAVING THE BURROW

Larvæ that gnaw into wood, such as those of the Capricorn and the Buprestes,3 for instance, ought to be able to answer the first question. They make their way inside a tree-trunk, boring galleries by eating the materials of the road which they open. Detached in tiny fragments by the mandibles, these materials are digested. They pass through the pioneer’s body from end to end, yielding up their meagre nutritive elements on the way, and accumulate behind, completely blocking the road which the grub will never take again. The work of excessive division and subdivision, done either by the mandibles or the stomach, causes the digested materials to take up less room than the untouched wood; and the result is a space in front of the gallery, a chamber in which the grub works, a chamber which is greatly restricted in length, giving the prisoner just enough room to move about.