EGG.—Conical, the base ronnded; marked by 8 or 9 vertical ribs, which near the base are depressed, but on upper third are considerably elevated, increase gradually in prominence and terminate abruptly around a small depression at summit ; these ribs are compressed and their sides are cut by grooves perpendicular to the surface of the egg; the spaces between them crossed by many fine striæ ; color green. Duration of this stage 5 days.