The collection which forms the subject of this Paper was kindly presented to the Ent. Soc. Ont. by Mr. D'Urban, and the specimens are kept for reference in the form in which they were given, because they were determined by Mr. Walker, the labels all being in his handwriting and many of the insects being types of his species. Many of the species were collected in the valley of the River Rouge, and some of them are mentioned in two papers in the Canadian Naturalist and Geologist, vol. 5, pages 91-6, and vol. 6, pages 36–41.