One may guess that eggs are laid about July within young soft cones (though none were seen in a single cone examined) and do not hatch until the next year, after the seeds have reached mature size. There are no signs that a larva eats more than one seed.Young cones are cylindrical. They gradually become globose as they mature. Infected cones develop into a distorted sphere (Plate 12c) and it may be conjectured that this is because infected seeds and seed scales do not swell in the normal manner. More material needs to be studied to elucidate these points.