38 
THE GRAPE ROOT-WORM. 
or destroyed some time before the post-larval period, a new one is 
readily made, and, as a rule, within a shorter time than was required 
for the making of the first cell. As recorded in Table XV, individual 
No. 21, a larva made the second cell and pupated within 9 days. 
Table XV. — Observations on the transformations and habits of the pupa and the beetle 
of the graps root-worm in the soil, from breeding experiments at North East, Pa., 1909. 
Number of individual. 
1 
2 
3 
4 
5 
6 
7 
8 
9 : 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 June 
21 ...do. 
22 | May 
23 i June 
24 June 
25 May 
26 L.do. 
Date. 
Making 
of cell. 
May 
May 
May 
May 
May 
Mav 
Mav 
May 
..do. 
May 
May 
May 
Mav 
May 
Mav 
Mav 
...do. 
..do. 
..do. 
26 
May 
. . .do. 
...do. 
...do. 
June 
May 
June 
June 
Pupa- 
tion. 
June 17 
..do... 
..do... 
June 15 
June 20 
June 19 
June 21 
L . . do 
June 20 
June 21 
June 24 
I June 20 
June 21 
...do.... 
I. ..do.... 
! June 20 
June 18 
June 21 
..do... 
..do.... 
..do.... 
June 16 
June 24 
June 21 
June 22 
June 26 
June 23 
..do. 
June 25 
..do. 
June 2 
June 22 
June 23 
June 25 
June 26 
June 25 
June 29 
June 21 
June 10 
June 23 
..do .... 
Trans- 
formed 
to beetle. 
Total. 
June 30 
July 1 
July 2 
June 30 
July 7 
July 9 
July 10 
...do.... 
July 2 
July 9 
..do.... 
..do.... 
July 10 
...do.... 
July 9 
..do.... 
July 7 
July 10 
July 9 
..do.... 
July 6 
July 12 
July 11 
July 13 
..do 
July 11 
..do 
..do. ... 
July 12 
July 14 
July 23 
July 10 
July 12 
July 11 
July 14 
July 15 
July 17 
July 8 
Left the 
cell. 
July 6 
(Died). 
..do... 
July 5 
July 14 
...do 
(Died). . 
July 13 
July 14 
July 13 
...do... 
July 14 
July 13 
July 16 
July 13 
...do... 
...do... 
July 13 
July 16 
July 16 
(Died). . 
July 14 
..do 
...do. 
...do.... 
July 18 
July 17 
July "l7' 
July 11 July 15 
Days. 
Making 
cell. 
Pupal 
stage. 
10 
18 
15 
513 
Table XVI. — The making cf the pupal cell, the pupal period, the beetle in the cell; 
summary of Table XV. 
Average. 
Maximum. 
Minimum. 
Days. 
Days. 
Days. 
The making of the pupal cell 
21.4 
33 
9 
Pupal stage 
17.8 
21 
12 
Beetle in cell 
4. 1 
7 
2 
THE POST-LARVAL STAGE. 
During the post-larval stage the grub undergoes marked structural 
changes and is in this condition extremely delicate and helpless. The 
body is slightly shortened, and the curved grublike appearance is modi- 
