In C. Ent., 14, p. 223, I stated that Newman, in Nat. Hist. Br. But., described the mature larva as pupating in a case specially prepared for the purpose on the plant it had been feeding on: “from the roof of this the caterpillar suspends itself and becomes a chrysalls.” Also quoted from Harris, who says the larva “seeks a suitable place in which to undergo its transformations.” In the conclusion of the paper, vol. 15, p. 19, I said that I had never found a case with pupa in it, though I had often taken cases with the larvae in earlier stages, and I ventured the conjecture that both Harris and Newman were right, but that in our climate the larva pupated differently from its habit in England.