112 Bulle I in de la Société Royale Entomalogique d'Egypte 
The inferiority of N° 69 is again marked by the 
greater length of time taken to develop, four to five 
days delay in July being a relatively large amount, 
when compared with the 48 to 54 days required for 
the post-embryonic development of the other nine in¬ 
dividuals. 
N° 64 and N° 68 show that a long life and a large 
progeny are not incompatible, but N° 67 shows that 
they are not necessarily related; on the other hand 
N° 65 with a short life and only 6 moults is the most 
1 i 
fertile of all and N° 67, whose life-history is in other 
respects almost identical with that of N° 65 , has less 
than one-sixth of the number of descendants. 
We make no attempt to explain these facts, but 
it was necessary to point them out to avoid hasty 
conclusions being drawn from our other data. 
In Table II we give the life history of females 
from egg-cases of which one or more were allowed 
to copulate, either immediately after the last moult 
or after several egg-cases had already been laid. 
The sign « + » denotes the females which paired 
before making their first egg-case and the sign « — » 
th ose which paired later. The absence of any sign 
denotes a virgin. 
