In May, of the present year, at Coalburgh, I bred a large number of larvæ from eggs laid by tharos, var. marcia; also several from eggs laid by ajax, var. Walshii; and from eggs laid by Lyc. pseudargiolus; and all of the chrysalids of tharos, and part of those of the other two species, were placed in small tin boxes as they formed, and at different intervals thereafter, 10, 20, 60 minutes up to some hours, and one and two days, were laid in the ice box on top of the ice. The box was supplied with ice once a day.