Having been requested by my friend, Mr. Wm. H. Edwards, to make observations on Danais Archippus during the seasons of 1887 and 1888, and subsequently having written to him the result of such observations, he requested me to publish in the Canadian Entomologist the substance of what I had already written him in my letter. I wrote out a paper about July 5th, which, however, was lost in the mails, and the paper now sent is a partial copy of the original, though somewhat altered, as the first was over four months old.