In 1894, Mrs. J. J. Glessner, Littleton, N. H., called my attention to a “worm” which was feeding in the roots and stems of her columbines. It was not until July, 1895, however, that she succeeded in getting specimens of the “worm” for me. The “worm” proved to be a caterpillar which was unfamiliar to me, and in accordance with my usual practice in such cases, it was described and photographed. The photographs, giving dorsal and lateral views of the caterpillar, twice natural size, are reproduced on the plate.