THE CHERRY 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 period spent in the ground by stages of the cherry leaf-beetle. 
Number of Period in Number of Period in 
individuals. ground, individuals. ground. 
Days. Days 
2 14 116 23 
1 15 47 24 
1 16 62 25 
1 17 30 26 
9 18 3 27 
44 19 1 28 
30 20 
68 21 563 1 22.36 
148 22 
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 Developmen- Number of Developmen- 
individuals. tal period. individuals. tal period. 
Days Days 
3 31 2, 37 
27 32 1 39 
67 33 1 40 
63 34 
45 35 218 1 33.76 
9 36 
1 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-history data obtained. 
