214 
Psyche 
[December 
DAYS AFTER PARTURITION 
Fig. 10. Effect of delayed exposure to males on receptivity of females 
following parturition in N. cinerea. The axis of abscissas indicates the 
days after parturition the females were placed with males. Numbers in 
circles indicate the numbers of females used. Gestation period 35 - SO 
days. Females fed during gestation and after parturition. 
receptivity. The results were similar whether females which had 
their oothecae removed I - 2 days after ovulation were exposed to 
males for I hr. daily, or were exposed to males continuously (fig. n, 
cf. □ and A). Note the similarity between figures 2 and 12 (both 
done under similar conditions). The same relationship holds for 
the return of receptivity as for the time taken to oviposit following 
removal of the oothecae at various periods of pregnancy. Virgin 
females differ from mated individuals in that receptivity returns 
sooner when the ootheca is removed from the uterus (figs, n, 12; 
table 4). 
