1964] 
Roth — Reproduction in Cockroaches 
225 
ment following parturition if starvation is continued. More than 
25% were still receptive after 9-10 days isolation from males and 
food. In the experiments with females starved during gestation 
and after parturition, only data from individuals that lived at least 
5 days after being placed with males was used. However, starved 
females that mate after being isolated for several days after partu- 
rition do so almost immediately on being placed with males. The 
results with females starved during gestation but fed after partu- 
rition differed markedly from females fed during and after gestation. 
Ninety-eight per cent were receptive and this did not change even 
after 5-6 days isolation from males (fig. 16B, lined bars). Sixty- 
five per cent were still receptive after 7-8 days isolation and this 
dropped to 20% only after 9-10 days of isolation. In all females 
that mated, the oocytes averaged less than 1.5 mm. long 
(fig. 16A, B). 
Females of L. maderae which feed during and after gestation also 
become unreceptive if they are isolated from males; and as in N. 
cinerea, starvation after parturition prolongs receptivity (table 3). 
12.2 ±0.2 
14.9 ± 0.3 
i 90 #0 _ _ _ _ _ 
• • #o#o«o o o#o o o o o 
• #0 90 90 90 O #0 •O O - ‘ “ 
000000 
K 10 
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 
15 . 5 ± 0.2 
1 
II 
nfln nnnfirinnnn 
0 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 
DAYS TO OVIPOSIT 
Fig. 15. Receptivity and oocyte development following parturition in 
N. cinerea starved during gestation. Top: Females exposed to males and 
food after parturition. Solid circles — receptive females. Open circles — 
non-receptive females. Each circle represents one female. Days to oviposit 
calculated from time of exposure to food. Bottom: Females that were not 
exposed to males after parturition. (N — 213). Days to oviposit calculated 
from time of parturition ; females were given food within a day after 
giving birth. Numbers above the arrows indicate the average number of 
days ± standard errors taken to oviposit by the various groups of females. 
