36 PAPERS ON INSECTS AFFECTING VEGETABLES. 



living cabbage plant, and were supplied with diluted molasses as 

 food. The following is a summary of the three succeeding genera- 

 tions : 



SECOND GENERATION. 



September 12-13 Twelve adults issued. 



September 14 -First eggs deposited. 



September 16 The eggs batched. 



September 29 First larvae reached maturity. 



October 1 First larvae pupated. 



October 7 First adults issued. 



October 8 More adults issued. 



From the above record the stages are as follows : 



Days. 



Egg stage 2 



Larva stage 15 



Pupa stage G 



Total 23 



THIRD GENERATION. 



October 7-8 Adults issued. 



October 9 First eggs deposited. 



October 12__ The eggs hatched. 



October 26 First larvae reached maturity. 



October 28 First larva? pupated. 



November 6 — -First adults issued. 



November 7 More adults issued. 



From the above record the stages are as follows : 



Days. 



Egg stage 3 



Larva stage 16 



Pupa stage 9 



Total 28 



FOURTH GENERATION. 



November 6-7 Adults issued. 



November 9 First eggs deposited. 



November 12 The eggs hatched. 



November 27 First larvae reached maturity. 



November 29 First larvae pupated. 



December 11 First adults issued. 



From the above record the stages are as follows: 



Days. 

 Egg stage 3 



Larva stage 17 



Pupa stage 12 



Total 32 



