In the spring of 1871, my attention was attracted by the peculiar manner in which many of the leaves of the Laurel Oak (Q. imbricaria) were rolled up. The cases thus formed were compact and cylindrical, varying in length from one third to one half an inch, by an average diameter of one-fifth of an inch, and very neatly finished up. Several of them were opened, and each found to contain a single, smooth, spherical, translucent-yellow egg, about 0.04 inch in diameter. Desirous of rearing the insects, I collected quite a number of the interesting little nests, and watched, with much curiosity, for the larvae to appear-not knowing, at that time, what to expect.