The Growth and Habits of Carausius morosus. 361 



in every case with a very even average of days, and so may 

 be left out of consideration. As regards the later interval, 

 there is considerable variation. Nos. 88 and 68e died in 

 the midst of their egg-dropping, so there was no interval ; 

 No. 42 died 29 days after her last egg was dropped ; No. 43 

 died 30 days after, while No. 68/ died 45 days after dropping 

 her last egg, and so on. 



Excepting the case of No. 159, the abnormally short 

 insect, there does not appear to be any actual correlation 

 between the size of the insect and the quantity of egos it 

 can produce. 



For instance, one insect 73 mm. long produced 595 eggs, 

 and another 83 mm. long produced 536 eggs, or 59 eggs 

 less, although it was 10 mm. longer. Four insects 79 mm. 



ABNORMAL 



RK5-HT 

 SIDE 



NORMAL 



^NTRM? ' DORSAL^ RIGHT 

 ASPECT ASPECT 5IDE. 



long each produced respectively 443, 513, 536 and 591 eggs, 

 and so on. 



As regards the quantity of eggs produced per mm. 

 length of the insect, two insects 75 mm. long each produced 

 4 and 7'4 eggs per mm. length respectively, while 6 insects 

 81 mm. long each produced 4'5, 5"5, 6*1, 6-8, 7 and 7*5 eggs 

 per mm. length respectively. The average number of 

 eggs produced per mm. length of the parent (exclusive of 

 the original, which was not measured, and the abnormals 

 Nos. 18, 22, 41 and 159) is 6'5. 



There does not seem to be any seasonal differences in 

 the rise and fall of egg-production, which is quite inde- 

 pendent of the time of year. Nor does the egg-production, 

 in so far as quantity is concerned, depend absolutely on the 

 number of days lived (Second Period) ; thus No. 78 lived 

 229 days and produced 578 eggs, while No. 38 lived 327 



TRANS. ENT. SOC. LOND. 1916.— PARTS III, IV. (APRIL '17) B B 



