The eggs of katydids are not commonly found. They are sometimes buried in soil or inserted in leaves and stems of plants. However, the eggs of some species are laid in rows on the surface of twigs. The only katydid eggs I've encountered are probably those of the Greater Angle-wing (Microcentrum rhombifolium) but I don't know if other related katydids' eggs look similar. These look like flattened gray oval buttons aligned in two rows along a tree twig. When the eggs hatch, they open like an oyster, separating at the seam along the edge. Empty eggs resemble a row of little bivalves. Sometimes I've found these eggs with a circular hole in the center of each one. Since the eggs do not hatch in this way, I can only deduce that a predator of some kind ate the contents.
