242 
Psyche 
[December 
Given an adequate diet during gestation and after parturition, 
an additional mating does not increase the rate of oocyte develop- 
ment in N. cinerea and L. maderae. The oocytes of pregnant females 
of N. cinerea starved during and after gestation, usually do not 
develop after parturition. Mating increases the percentage of females 
which mature their oocytes if N. cinerea females that were starved 
during gestation are first fed for 2 or 3 days after giving birth. The 
combined effects of mating and nutrition on oocyte development are 
in agreement with the hypothesis that mating is effective in stimu- 
lating the corpora allata only if these endocrine glands have first 
reached a critical level of activity. 
During pregnancy, mechanical stimuli resulting from the ootheca 
in the uterus inhibit the corpora allata and consequently the oocytes 
remain undeveloped for almost the entire (N. cinerea) or entire 
(P. surinamensis) gestation periods. 
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