146 Bulletin de la Société Royale Entomologique d'Egypte 
being slightly more numerous. As we only bred a few 
from each egg-case, this small difference may be 
merely accidental. 
Comparison with known facts concerning the 
Phasmidae and the Acridiidae added to the fact that 
only half the potential number of young are produced 
in the very best cases make it highly probable that 
males would only occur rarely, if at all. 
11. There are usually 7, frequently 8 and some¬ 
times only 6 moults. There is no evidence that the 
1/ 
number of moults of any individual is affected by the 
virginity of the mother. 
If the rate of development is affected, it is 
lenghthened slightly. 
12. The winter months may be passed in any 
stage. There is no hibernation, but the insects live 
very slowly so that one winter month corresponds to 
about one day in July or August. Thus the post- 
embryonic stage varies from 2 to 8 months and the 
adult stage varies about to the same extent. 
If the virginity of the parent has any influence 
on the length of the adult’s life, it is not of any great 
extent. 
CONCLUSION. 
This preliminary analysis of our data shows how 
little we know of even common insects. I do not think 
that parthenogenesis occurs in this family, at any rate 
