38 
Indian Forest Records. 
[Vol. VII. 
As the sack-bands were put up too late, in this area, the earlier swarms 
were not obtained. All the trees in this area showed robusta attack. 
In the following table the records of the four localities are amalgamated. 
Table 14 .—Larvce and Pupce collected from Sack-bands , Dehra Dun, 
April — May, 1916. 
Time of collection. 
Total collection. 
Time of collection. 
Total collection. 
March— 
May— 
31st 
, . 
670 
1st 
# , 
237 
April— 
1st . 
2,040 
2nd 
352 
2nd . 
Not examined. 
3rd 
997 
3rd . 
1,453 
4th 
1,770 
4th . 
1,402 
5th 
2,050 
5th . 
3,442 
6th 
2,913 
6th . 
5,691 
7th 
2,095 
7th . 
4,260 
8th 
1,861 
8th . 
5,962 
9th 
2,289 
9th . 
Not examined. 
10 th 
1,553 
10th . 
7,461 
11th 
1,223 
11th . 
3,503 
12th 
1,208 
12th . 
2,673 
13 th 
1,103 
13th . 
2,334 
14th 
1,247 
14th . 
2,037 
15th 
• 1,021 
15th . 
1,497 
16th 
956 
16th . 
467 
17 th 
837 
17th . 
717 
18th 
769 
18th . 
2,530 
19th 
• 547 
19th . 
961 
20th 
438 
20th . 
279 
21st 
366 
21st . 
121 
22nd 
266 
22nd . 
98 
23rd 
182 
23rd . 
94 
24th 
178 
24th . 
76 
25th 
25th . 
110 
26th 
26th . 
73 
27th 
27th . 
67 
28th 
28th . 
101 
29th 
29th . 
127 
30th 
30th . 
143 
31st 
Grand 
' Total 
76,849 
In Plate VI are given curves for the swarming of the larvae of the 
first and second generations, constructed, firstly, by plotting the points 
of the actual progressive daily totals of larvae, etc., collected, and con¬ 
structing a regular curve through these points ; and, secondly, by reading 
off from this curve the theoretical progressive daily totals ; and, thirdly, 
by calculating by difference from the figures so obtained, the theoretical 
[ 183 ] 
