GRAPEVINE FLEA-BEETLES. 
15 
DURATION OF FIRST LARVAL STAGE. 
The duration of the first stage, of 74 larvae reared, varied from 3 
to 9 days with an average of 6.16 days, as shown in Table XIV. 
Table XIV. — First larval 
stage of A . ivoodsi, North 
East, Pa., 1916. 
Table XV. — Second larval 
stage of A. woodsi, North 
East, Pa., 1916. 
Number of 
Duration 
Number of 
Duration 
larvse. 
of stage. 
larvae. 
of stage. 
Days. 
Days. 
1 
3 
4 
4 
1 
4 
18 
5 
17 
5 
15 
6 
32 
6 
11 
7 
16 
7 
14 
8 
3 
8 
2 
10 
4 
9 
1 
15 
174 
2 6.16 
165 
2 6. 46 
1 Total. 
2 Weighted average. 
1 Total. 
2 Weighted average. 
The records in this stage cover a period from June 18, the earliest 
recorded date of hatching, to July 15, the latest recorded date of 
passing the first molt. 
DURATION OF THE SECOND LARVAL STAGE. 
The duration of the second larval stage varied from 4 to 15 days 
with an average of 6.46 days, as shown in Table XV. The total 
period covered by records on larvae of 
this stage extended from June 25 to 
July 21. 
Table XVI. — Feeding period of 
third larval stage of A. woodsi, 
North East, Pa., 1916. 
Nvraiber of 
Duration 
larvae. 
of period. 
Days. 
2 
3 
2 
4 
9 
5 
12 
6 
7 
7 
1 
8 
4 
9 
3 
10 
1 
13 
141 
2 6.51 
DURATION OP FEEDING PERIOD OF THIRD LARVAL 
STAGE, NORTH EAST, PA., 1916. 
The duration of the feeding period of 
the third stage of 41 larvae varied from 3 
to 13 days, with an average of 6.51 days, 
as shown in Table XVI. The total period 
covered by records of larvae in this stage 
extended from July 1 to 26. 
DURATION OF PERIOD IN GROUND. 
1 Total. 
2 Weighted average. 
The period in the ground includes the 
prepupal period, which is the latter part 
of the thu-d stage, the pupal period, and the early part of the adult 
stage before emergence from the pupal cell. Fifty-three individuals 
were carried through this period. The minimum time required 
was 14 days, the maximum 21 days, and the average of 16.15 
days. The period covered by these records extended from July 7, 
when the first larva entered the ground, until August 29, when the 
last adult emerged. These data are given in full in Table XVII. 
