At the Annual Meeting of the Entomological Society of Ontario in October, 1885, I read a brief note on Oryssus Sayi, which was afterwards publihsed in the Canadian Entomologist (vol. xviii, page 30). It recorded the capture of two ♀ and one ♂ on cedar telegraph poles, and suggested that they might have emerged therefrom. During the arly summer of 1886, I added several specimens of Oryssus to my collection, and what is of much more importance, succeeded in gaining a more definite knowledge of the habits of our species. As no account, other than the brief note just cited, has ever appeared in the Entomologist of these handsome and interesting insects, I propose to give a brief paper upon them.