Note 2 — CHAP. I. THE ARCHITECTURE OF ANTS.

The terms of Larva and Pupa are employed to designate the intermediate states of existence in the insect, on its passage from the egg to its becoming a perfect animal, endowed with all the powers of its race, the former being commonly known under the appellation of Grub or Caterpillar, the latter of Chrysalis or Aurelia. The ant remains, according to Gould, in the first or larva state of existence nearly a twelvemonth, in the state of pupa about six weeks, and as a perfect insect 16 months. The time, however, they remain as larvæ and pupæ is, no doubt considerably influenced by variations in the temperature, and other causes. M. Reaumur hastened the disclosure of the butterfly by keeping the aurelia or pupa in a warm room, and retarded it by placing it in an ice house. Mr. Kirby once kept one of the aphidivorous flies—the whole term of whose existence, according to this intelligent entomologist, does not, in the summer, exceed at the very utmost six weeks—several months in the state of larva; and, paradoxical as it may seem, by simply neglecting to give it food.—T.