Séance du 16 Avril 1924 
125 
gularities which occur in the intervals between ovi- 
positions. The cause of these irregularities must there¬ 
fore be looked for in some disturbance which occurred 
after the last, moult. The material for such an inves¬ 
tigation is somewhat scanty, nevertheless it is suffi¬ 
cient to make it highly probable that the relations 
betwF'ui the sexes are the disturbing factor. N° t 6 
paired on July gth and ate the male on the 12th, the 
day before making its first egg-case; N° 88 paired on 
the a 3 rd of July — and perhaps before — and ate 
the male during copulation, some hours later the first 
egg-case was laid. No other male was supplied to 
either of these and it is worth v of notice that no other 
t i 
was necessary as N° 88 gave the largest number of 
descendants, 1216, with the greatest average number 
per egg-case, nearly 72, and, finally, from its 12th 
egg-case 101, the maximum for any egg-case. Looking 
at table VIII, we see that the intervals for these two 
females show no irregularities. 
N° 25 paired some time between the 5 th of July 
and the laying of the first egg-case on the 12th; on 
the 1 3 th the male flew awav and the next dav another 
male was introduced into the cage. This male was 
eaten on the 2nd of August. Copulation was not ob¬ 
served or the record is omitted. No other male was 
introduced and after the three irregular intervals — 
7,8, 2 — from the 3 rd to the 6th egg-cases, regularity 
is unbroken until the laying of the last three eg£- 
cases. Now the second male moulted for the last time 
on July 1 3 th and 1 if copulation did take place it was 
about the time of making the 3 rd egg-case. Adding 
together the three intervals and taking the average, 
