As Mr. Grote has done me the honour to make certain criticisms on some of my recent papers, I would ask space for a brief reply.

In regard to Gortyna Ærata,I have no doubt that it has an alternative food-plant, but possibly it may never be discovered. Mr. Bird has made the same point, that as burdock is an introducted species it could not be the original preferred food-plant of any American species. But, while I admiit that an introduced species could not be the original food-plant of an American insect, I see no reason why it should not be the preferred food since its introduction, just as Doryphora Decemlineata prefers the potato to its original food-plant.