384 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 16 
Table II.— Length of Life of Aedes calopus Larvae in Water Covered with 
Petroleum Film. Periods of Exposure 5 to 30 Minutes 
Petroleum Removed After 
Time 
5«min. 
Bottle 1 
10 min. 
Bottle 2 
15 min. 
Bottle 3 
20 min. 
Bottle 4 
30 min. 
Bottle 5 
10.25 a. m. 
20 
20 
20 
20 
20 
11.00 
18 
12 
11 
9 
13 
11.30 
18 
8 
9 
7 
11 
12.00 
18 
3 
5 
2 
7 
12.30 p. m. 
18 
3 
3 
1.00 
18 
2 
3 
1.30 
17 
1 
2 
2.00 
12 
1 
1 
2.30 
12 
1 
1 
3.00 
8 
1 
1 
4.00 p. m. 
7 
1 
7.30 a. m. 
5 
Table III.— Length of Life of Aedes calopus Larvae in Water Covered with 
Petroleum. Periods of Exposure 1 to 5 Minutes 
Petroleum Removed After 
Time 
1 min. 
Bottle 1 
2 min. 
Bottle 2 
3 min. 
Bottle 3 
4 min. 
Bottle 4 
10.00 A. M. 
20 
20 
20 
20 
10.25 
20 
16 
13 
10 
11.00 
18 
10 
8 
6 
11.30 
16 
8 
6 
4 
12.00 
11 
5 
5 
3 
12.30 m. 
11 
5 
4 
3 
1.00 
11 
4 
3 
3 
1.30 
10 
3 
1 
3 
2.00 
10 
3 
1 
3 
3.00 
7 
3 
1 
3 
4.00 
7 
3 
1 
3 
5.00 
7 
3 
1 
3 
8.00 A. M. 
7 
3 
1 
3 
5 min. 
Bottle 5 
20 
12 
8 
4 
2 
2 
2 
2 
1 
1 
1 
1 
1 
