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 hatched. 
September 29 First larvae reached maturity. 
October 1 First larvae pupated. 
October 7 First adults issued. 
Octobers More adults issued. 
From the above record the stages are as follows: 
Days. 
Egg stage 2 
Larva stage 15 
Pupa stage 6 
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 larvae 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 
