The adults emerge in July. In a sample analysed in March 1976 three quarters of fully sized seeds were infected. The life cycle of the moth is not yet fully known nor is it known how long the female cones of A.obtusa take to mature. It may reasonably be conjectured that, like A. robusta (sect. 6 ·1), they take 1· 5 years. 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.