Probably everyone will agree with Dr. Pearsall's remarks in the April number of this journal as to the necessity for a revision of the North American Geometridæ. The whole group is in a sad state of disorder; the old species are not all well understood and many of the newer ones (Dr. Hulst's and Dr. Strecker's), being unfigured and insufficiently described, are very difficult to identify. It will be some time yet, I fear before anyone will be in a position to attempt a completed monograph, and probably it will be better to take up the work genus by genus, as Dr.Pearsall is doing.