The results of my experiments with P. Ajax, as noticed in Nos. 8 and 9 of the Canadian Entomologist (Vol. ii. pp. 115 and 133), are as follows :

From six larvæ obtained from eggs of Ajax:, deposited in capitivity, 16th May, 1870, I obtained two males, four females, Marcellus, between 20th and 24th June.

From twenty-four larvæ from eggs of Ajax deposited 2nd June, I obtained twelve males, ten females, all Marcellus, between 3rd and 9th July, and one chrysalis went over the winter.

From five larvæ from eggs of Marcellus, deposited 7th June, I obtained four female Marcellus between 4th and 9th July, and one chrysalis went over the winter.