On the night of the 7th of last June my wife captured at light a fine female Samia columbia. The moth was at once secured, her wings pinioned, and she was placed in a cage with the hope that specimens of the other sex might be attracted, but none made their appearance; and on the night of the 12th she laid five eggs, glueing them to the gauze on the side of the cage, two in one place and three in another. During the following day (13th) none were laid, but on the night of the 13th she laid fourteen more in several different clusters, and on the night of the 14th she aid six more. None were laid during the following day and night, and as she was injuring herself with the pinion, she was killed and spread. Whether she would have laid any more had she been kept longer, or whether she had laid any before her capture, I cannot say.