Table 2 Prothoracic glands inhibit growth of the basal oocytes in Leucophaea maderae Implantation of prothoracic glands into adult virgin females*

Age of donors Number of animals Termination, days after implantation Oocyte length mm Last instar nymph, second half 24 29 - 47 1.15 0.02 Nymph, 3 - 5 days before metamorphosis 11 19 - 20 1.75 0.22 Nymph, 1 - 2 days before metamorphosis 12 21 - 29 2.77 0.24 Adult, 1 - 4 hours before metamorphosis 5 30 - 36 2.34 0.39

L* Age of the hosts was 5 to 12 days after metamorphosis. Unoperated virgins generally begin to incorporate vitellogenin into the oocytes about 1 to 2 weeks after metamorphosis and thereafter oocyte growth proceeds at a slow pace. Also compare to the figures in Table 1,b. standard error of the mean.