There are still a few species of Agrilus in our fauna whose food plant is unknown, Any contribution in that direction may, therefore, be of interest. It is a genus that seems to be much neglected bv collectors, owing undoubtedly to the difficLrlty met with in separating some of the species. There are several seemingly difiicult ones, however, which are stamped with such distinct characters as to make their study exceedingly interesting. With Dr. Horn's valuable paper, “The Species of Agrilus of Boreal America,” and a well-trained eye, one should be able to get along without much assistance. That does not apply to myself, for it was only after Mr. Blanchard kindly undertook to help me out that my material was properlY labelled,