THE CHERRY LEAF-BEETLE. 11 
TaBLe I.—Period of first larval instar of the cherry leaf-beetle at North East, Pa., 1915. 
J Duration of | 
Number of L 
individuals. fast pe ye! 
Days 
79 4 
140 5 
17 6 
2 7 
t 10 
1 11 
243 14.83 | 
| 
1 Average. 
Second instar.—Data for the duration of the second instar were 
obtained from observations on 268 larve. The period covered by 
these observations was from August 6, when the earliest first molt 
took place, to August 29, when the last one molted for the second 
time. Table II shows the results obtained: 
TaBLeE I1.—Period of second larval instar of the cherry leaf-beetle at North East, Pa., 1915. 
Duration of 
Number of 
: individuals. second latwal 
Days. 
145 3 
100 4 
i8 5 
5 6 
1 a 
269 13.58 
1 Average. 
Third instar.—When the larva becomes full grown it leaves the 
tree, burrows into the soil for a fraction of an inch, and constructs 
its pupal cell. That portion of its life between its second molt and 
its entrance into the ground—that is, the feeding period of this 
instar—was determined for 349 larve, with the results given in 
Table III. The first of these to molt for the second time did so 
on August 7, and the last one entered the ground on September 5. 
TaBLeE III.—Feeding period of third larval instar of the cherry leaf-beetle, 
North Kast, Pa., 1915. 
Feeding period 
Number of p 
Reitaaees of third larval 
individuals. aie. 
Days. 
64 3 
211 4 
55 5 
8 6 
8 7 
3 8 
349 14,12 
1 Average. 
