12 BULLETIN 352, U. S. DEPARTMENT OF AGRICULTURE. 
Total feeding perrod.—A total of 227 larve were carried through 
the entire feeding period from hatching to entrance into the ground. 
Table IV contains the data obtained. These data were obtained 
during the period from August 5, when the first one hatched, to 
September 5, when the last one entered the ground. 
TaBLeE LV.—Total feeding period of larve of the cherry leaf-beetle, North East, Pa., 1915. 
Number of Total feeding | Number of Total feeding | 
individuals. period. | individuals. period. 
Days. | Days. 
3 10 | 1 16 
e 49 11 | 2 17 
115 12 | 5 18 
36 13 2 20 
7 14 
af 15 227 112.33 
} 
1 Average. 
PERIOD IN GROUND. 
The pupal cell is nearly spherical and about 5 mm. in diameter. 
It is from a fourth to a half inch below the surface. Within it the 
insect passes through the transformations from 
larva to pupa and from pupa to adult. The 
larva hes for several days curled up as shown 
in figure 8 before transforming to the pupa. 
Data on the dates of transformation of the 
larva are difficult to obtain, since this neces- 
sarily involves the breaking up of the pupal 
gf ga cell, and such data as were obtained are based 
Fig.8.—The eee -beetle: on but few individuals. 
ap eaEe Bra Ba, Prepupal period.—In a lot of larve that 
entered the ground on August 5 daily examination showed that the 
first one pupated on August 13, or 8 days later. On the same day 
1 pupa was found among larve that entered the ground on August 
6, giving a prepupal period of 7 days. One out of 3 larve that 
entered the ground on August 7 had pupated 7 days later, on 
August 14. Larve that entered the ground on September 4 and 
5, when the weather was much warmer than in August, required 
oa 5 days to pupate. 
Pupal period.—In the August lots just mentioned the first trans- 
formation to the adult stage took place 9 days after the first pupa- 
tion, while in the September lots the pupal period was only 7 or 8 
days. Ina lot which entered the ground on August 22 the first one — 
pupated on September 10, 19 days later. Unfortunately, the pre- 
pupal period for these was not determined, but as that period was 
passed during the very cold days of late August, 1t was undoubtedly 
longer than in the earlier and later lots, and the pupal period was 
probably close to 11 days in length. 
