Part VII] Beeson: Life History of Toon Borer . S8 
Experiments were carried out with the object of determining the 
number and length of the stadia of the larvae of the first generation. 
The larvae were reared from the earliest stages available in the field in 
various types of cages. The most suitable form of receptacle was found 
to be an earthenware jar about 4 inches high and 2 inches square closed 
with a muslin cover. Glass jars were tried, but discarded, as owing 
to the rapid evaporation of moisture from the inflorescences, given as 
food, moulds readily developed. The pottery jars maintained a more 
even dispersal of deposited moisture and prevented excessive growth of 
moulds. Too excessive evaporation was avoided by standing the jars 
in shallow trays containing about half an inch depth of water. The 
larvso fed readily on the flowers supplied, and on reaching full size spun 
up cocoons inside the tangled mass of flower fragments and excreta. 
A tendency to restlessness before pupation was generally exhibited, 
indicating that the normal habit of pupation is not at the site of feeding. 
The table below gives the relative development of the larval stages of 
20 individuals of the first generation. 
Table 3. —Development of the Larval Stages of the First Generation , 1916. 
1 ndividual Serial 
Date 
OF ATTAINING TO LARVAL STAGE, 
1916. 
Pupal 
Number. 
1st Stage. 
2nd Stage. 
3rd Stage. 
4th Stage. 
In 
Cocoon. 
STAGE. 
1 
March— 
29th . 
March— 
31st . 
April— 
2nd . 
April— 
5th 
April— 
8th . 
April— 
8th. 
2 
29th . 
April— 
1st 
3rd . 
5th 
7th . 
8th 
3 
April— 
2nd . 
5th . 
7th . 
9th 
12th . 
13th. 
4 
2nd . 
4th . 
6th 
8th 
10th . 
11th. 
5 
2nd . 
6th 
8th 
10th 
13th . 
13th. 
6 
2nd . 
5th . 
7th . 
9th 
12th . 
13th. 
7 
2nd . 
3rd . 
5th . 
7th 
10th . 
11th 
8 
2nd . 
6th 
8th . 
10th 
13th . 
14th. 
9 
5th . 
8th . 
10th . 
13th 
17 th . 
17th. 
10 
5th . 
9th . 
11th . 
13th 
16th . 
17th. 
11 
5th 
9th . 
11th . 
13th 
15th . 
17th. 
12 
5th 
7th . 
9th . 
11th 
14th . 
15th. 
13 
10th . 
12th . 
14th . 
16 th 
19th . 
19th. 
14 
10th . 
13th . 
15th . 
17 th 
20th . 
20th. 
15 
10th . 
12th . 
14th . 
16th 
19th . 
20th. 
16 
10th . 
14th . 
16th . 
18th 
22nd . 
22nd. 
17 
12th . 
16th . 
18 th . 
20th 
23rd . 
24th 
18 
12th . 
14th . 
16th . 
18th 
21st . 
22nd. 
19 
12th . 
15th 
17 th . 
19th 
22nd . 
23rd. 
20 
12th . 
14th . 
16th . 
18th 
22nd . 
22nd. 
The following table shows the actual number of days occupied by each 
of the larval stages during the feeding period of the above-mentioned 
[ 168 ] 
