In the second volume (1863,) of the Proceedings of the Entomological Society of Philadelphia, I published a paper on some of our Lepidopterous larvae, and among other descriptions there appeared one purporting to be that of Plusia balluca. By some unfortunate mishap a description of the larva of V. interrogationis was sent in place of the intended one of balluca, and the mistake was not discovered until after the number had been issued, while all trace of the original description of the larva of balluca was lost. I did not again meet with this larva until the summer of 1871, when a fresh description was taken on the l5th of June, as follows