THE CHEEEY LEAF-BEETLE. 



13 



Emergence of the adults takes place from a day to several days 

 after transformation. 



Total period in ground. — Five hundred and sixty-three individuals 

 were carried through this period of their development, the time 

 required varying from 14 to 28 days, with the greatest emergence on 

 the twenty-second day. Table V gives the data on this point. 



Table V. — Total 2^enod sj^ent in the ground by stages of the cherry leaf-beetle. 



Number of 

 individuals. 



Period in 

 ground. 



Number of 

 individuals. 



Period in 

 ground. 



2 

 1 

 1 



1 

 9 

 44 

 30 

 68 

 148 



Days. 

 14 



15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 



116 



47 



62 



30 



3 



1 



Days, 



24 



25 

 26 

 27 

 28 



563 



1 22. 36 



1 Average. 



The males required on the average 0.1 of a day longer than the 

 females, the average for the males being 22.41 days and for the 

 females 22.31 days. 



DEVELOPMENTAL PERIOD. 



The total developmental period, exclusive of the incubation period, 

 of 218 individuals was obtained. This varied from 31 to 40 days, 

 with the heaviest emergence on the thirty-third and thirty-fourth 

 days. Table VI gives the data obtained. 



Table VI.- 



-Total developmental period of the cherry leaf-beetle, exclusive of the incuba- 

 tion period, North East, Pa., 1915. 



Number of 

 individuals. 



Developmen- 

 tal period. 



Number of 

 individuals. 



Developmen- 

 tal period. 



3 



27 

 67 

 63 

 45 

 9 



Days. 

 31 

 32 

 33 

 34 

 35 

 36 



2 



1 

 1 



Days. 

 37 

 39 

 40 



218 



1 33. 76 



^ Average 



The males required 33.81 days and the females 33.73 days. Al- 

 lowing an incubation period of 11 days the total developmental 

 period would be in the neighborhood of 45 days. Table VII gives 

 in more detail all the life-historv data obtained. 



