On 20th June, 1884, I found on edge of leaf of an Aspen, P. tremuloides, a young larva of species of Nisoniades unknorvn. A small bit of the leaf was cut on two sides perpendicular to the edge, folded over and stitched down. At a little distance from this shelter a hole was eaten in the leaf. Two days later the hole was enlarged and the larva evidently had left its nest and returned to it after feeding. On 27th June one moult was passed, supposed to be the first; on 5th July a second; on 16th July a third. This was the last moult, but I am not sure that one did not take place between the 5th and 16th. It is probable there were four moults, as N. Lucilius is reported by Prof. Lintner to moult four times. The larva was kept in a jelly glass, and being always concealed in a leaf, a moult might have escaped me.