1964] 
Roth — Reproduction in Cockroaches 
221 
Ootheca removed I to 54+ days (parturition) after oviposition (N = I74) 
40 - 
30 - 
20 - 
co 10- 
Ld 
I 
< 
1 0 
LENGTH OF OOCYTES WHEN MATED (MM) 
Fig. 13. Frequency distribution of lengths of oocytes of females of N. 
cinerea that mated after their oothecae were removed from the uteri. The 
parturition group was females that gave birth normally. The top histogram 
is a combined summary of all the groups shown in the figure below. (Room 
temperature.) 
exposed to food for only 2 hr., the number of females that mated 
increased rapidly within the next 5 days (fig. 14) ; the oocytes of 
females that mated after this meal were 0.88 ±r 0.01 mm. long 
(N = 20). An additional increase in mating occurred when the 
remaining females were fed again ad libitum (fig. 14) ; the oocytes 
of 10 of these females were only 0.86 ± 0.02 mm. long. The 
