THE BEAN" LADYBIRD. 
9 
period extended from July 25 until September 2, a total of 40 days. 
With other females this period covered from 35 to 70 days. 
The life cycle from egg to adult and the periods of the stages by 
clays are given in Tables III and IV respectively. 
Table III. — Life cycle of EpilacJina corrupta. 
Event. 
Date. 
Event. 
Date. 
1916. 
Aug. 10 
Aug. 18 
Aug. 21 
Aug. 25 
Larvae molted 
1916. 
Aug. 30 
Sept. 3 
Sept. 5 
Sept. 12 
Larvae reached maturity 
Larvae pupated 
Table IV. — Periods of stages of Epilachna corrupta. 
Instar. 
Egg period 
First larval star? period. . . 
Second larval stage period 
Third larval stage period. . 
Number 
of days. 
Instar. 
Fourth larval stage period 
Pupal period 
Total 
Number 
of days. 
The beetles which developed August 31 fed, without mating or 
depositing eggs, until October 5. when they began hibernation. No- 
vember 10. 1916, the cage was placed in the laboratory cellar and 
removed to the open April 17, 1917. The beetles issued from hiberna- 
tion June 15, 1917, and were then killed, closing the record. 
Records of egg-laying were obtained by confining, single pairs of 
beetles, immediately after mating and before the first eggs were 
deposited, in small rearing jars. The beetles fed on bean leaves and 
the eggs were removed as deposited and counted. The number of 
eggs deposited by eight females of the first and second generations 
were: 504, 552, 616, 636, 850, 942, 1,147, and 1,516, respectively, or an 
average of 845 eggs to a single beetle. 
A detailed record of the female of one of these pairs of beetles, 
which developed July 17, 1916. and mated July 22, is given in 
Table V. 
Table V. — Egg-laying record of a single female of Epilachna corrupta in 1916. 
Date. 
1916. 
Julv 25 
July 28 
July 29 = 
Aug. 1 : 
Aug.3 
Aug. 5 
Aug. 6 
Aug. 9 
Aug. 11 
152117°— 20— Bull. 843 
Number 
of eggs 
deposited. 
Date. 
1916. 
Aug. 15 
Aug. 18 
Aug. 21 , 
Aug. 23 
Aug. 26 
Aug. 28 
Sept. 2 
Total 
Number 
of eggs 
deposited. 
850 
