144 Bulletin de la Société Royale Enlomologique d'Egypte 
of 2 5 mm. whereas 6 % of those laid by virgins are 
from 25 - 3 o mm. long and one was 87 mm. long. 
These very llarge egg-cases are nearly all the first one 
laid and their size can be attributed to the accumula¬ 
tion of the matter secreted by the colleterial glands 
while the female delayed oviposition in waiting for a 
partner. 
4 . The period between the final moult and the 
first oviposition is from 8 to 11 days in the case of 
fertilized females. Only two virgins out of the 35 
which made egg-cases laid within this period, 28 laid 
their first egg-case from i4 - 28 days after the final 
moult (of which 7 on the 17th day), and the remaining 
five after 3 i, 32 , 33 , 38 and 67 days interval. 
5 . The intervals between ovipositions are also 
increased, to the extent of about two days at the op¬ 
timum period of the year for the most vigorous females 
and to a much greater extent in other cases. 
6. The number of young which hatch from 
unfertilized egg-cases never exceeds half the normal 
amount and may be reduced to zero. 
7. Hatching in norma] egg-cases is generally 
simultaneous, though a few young may come out the 
day before or the day after the main group. In the 
case of unfertilized egg-cases it usually takes two or 
three days, frequently four and sometimes five days 
for the emergence to be completed. Equally large or 
nearly equally large numbers of young may emerge 
