On the 24th of April, 1868, I found under a log, near the Port Stanley Railroad track, a short distance from London, a young larva of an Arctian, which I supposed to be Parthenice, but since it differed slightly in appearance from the young of this species which I had reared before, I resolved to trace its history. In common with other allied species, this had evidently hybernated the winter through in the larva state, and had just awoke from its torpor.