July 7, 1923 
Mediterranean Fruit Fly in Hawaii 
7 
Table III. —Total parasitism of all larva of Ceratitis capitata collected in Hawaii 
during 1919 and 1920 (■monthly averages) 
Month. 
Number of 
larvae. 
Percentage of parasitism. 
Optus 
humilis. 
Diackasma 
tryoni. 
Diachasma 
fullawayi. 
T etrastickus 
giffardianus. 
Total. 
1919 
1920 
1919 
1920 
19x9 
1920 
1919 
1920 
1919 
1920 
1919 
1920 
January. 
2,419 
3,522 
6.8 
6.7 
i 7 *i 
5*2 
2.4 
12.4 
0.9 
4-8 
27.2 
29.1 
February. 
5,812 
2,113 
19 - 4 
10.6 
11.8 
7-7 
1.9 
4.4 
2.4 
16.0 
35-5 
38.7 
March. 
2,504 
1,639 
7-7 
23.6 
7.6 
2.7 
1.0 
8.7 
2.2 
10.9 
18. s 
45-9 
April. 
2,877 
3,673 
4.9 
i 5 *o 
13-3 
5 ” 9 
. 2 
2.6 
8.0 
2-8 
26.4 
26.3 
May. 
4,5x1 
10,055 
1.8 
19.4 
38.8 
26.4 
1.1 
i *3 
5 * 1 
2.7 
46.8 
49.8 
June. 
4,100 
xo, 5x2 
5-1 
7.6 
34-3 
24.8 
1-3 
14.4 
6.2 
1. 2 
46.9 
48.0 
July. 
8,788 
5,963 
22.0 
5-2 
28.9 
28.9 
1.0 
16.0 
8.1 
7-8 
60.0 
57 * 9 
August. 
7,648 
5,084 
7-4 
8-7 
8-3 
13-7 
1. 0 
24.1 
15-5 
10.5 
32. 2 
57-0 
September.... 
9,361 
6,848 
5-4 
4.8 
13-8 
27. 2 
3-0 
22. 7 
7*9 
20.4 
30.1 
75 -x 
October. 
10,676 
5, X04 
6.5 
2.0 
11.7 
46.8 
2.6 
8-5 
6.1 
7-1 
26.9 
64.4 
10,806 
x ,748 
6.9 
1-7 
21.1 
26.1 
1.6 
X 7-3 
8.4 
15-6 
38.0 
60. 7 
December. 
5,904 
i,i 45 
11.6 
•5 
33*5 
4.4 
.6 
9*7 
9.9 | 
18.4 
55-6 
33 * 0 
Table IV. —Total parasitism of all larva of Ceratitis capitata collected in Hawaii from 
1915 to 1920 (yearly averages) 
Year. 
Number of 
larvae. 
Percentage of parasitism. 
Optus 
humilis. 
Diachasma 
tryoni. 
Diachasma 
fullawayi. 
T etrastickus 
giffard¬ 
ianus. 
Total. 
Per cent. 
Per cent . 
Per cent . 
Per cent. 
cenL 
1915 . 
28, OIO 
3 1 - S 
0-3 
5-9 
O. 2 
37-9 
1916. 
83, 3°4 
17. 2 
13-3 
2. 1 
. 6 
33-2 
1917 . 
7 2 >i 39 
12. 7 
20.3 
7-3 
7.2 
47-5 
1918. 
63,480 
12.4 
34 ' 6 
2. 6 
6. 2 
55-8 
1919 . 
75j 406 
9-4 
19. 6 
1. 6 
7.6 
38.2 
1920. 
57> 406 
9.4 
22. 7 
12. 1 
7-7 
SI -9 
