By a recent article in this Journal giving the life-history of Sabulodes arcasaria, Walk., Dr. Otto Seifert demonstrates the need of careful study of some of our species of Geometridæ. A similar case has come under my notice. In June, 1896, I gathered in beating ten rough-looking mahogony-red larvæ from a small group of oaks(Quercus nigra). They were exactly alike in form and colour, and apparently well-grown, so I carried them home, supposing they would quickly mature. They had no thought of it.