NATURAL E M EMI Bfl . 
53 
Table XXI. — Parasitism of y rape root-norm eyys by Fidiobin fin ipt s at Sorth //</./. 
Pa., 1909, the eyys ranying in aye from 1 to 9 days. 
Grape root- worm 
Obser- 
Parasit- 
vation. 
Oviposi- 
Normally 
ii4 ic mug. 
Hatched. 
ized. 
1 
Julv 30 
JulV 31 
Aug. 1 
Aug. 3 
Aug. 4 
Aug. 5 
Aug. 6 
Aug. 7 
Aug. 8 
Aug. 11 
Aug. 12 
Aug. 13 
Aug. 14 
Aug. 17 
...do 
x 
<>2 
3 
X 
X 
X 
4 
X 
5 
6 
X 
X 
7 
Aug. 21 
Aug. 24 
Aug. 26 
X 
8 
X 
9 
X 
a Parasites placed with the host August 9. New parasites emerged September 10 to 12. Thirty-two to 
thirty-four days to complete the life cycle. Experiment No. 2 consisted of 15 root-worm eggs, of which 13 
became parasitized and 2 eggs developed root-worms normally. Eggs within two to three days of hatching 
escaped parasitism. 
Table XXII. — Parasitism of eyys of the yrapc root-norm by Fidiobia ft u ipes, at Xorth 
East, Pa., 1909, eyys varying in aye from fresh to 10 days old. 
Num- 
ber of 
obser- 
vation. 
Root- worm eggs. 
Num- 
ber of 
eggs. 
Emerg- 
ing root- 
worm 
larvae. 
Hatch- 
ing of 
para- 
sites. 
Oviposi- 
tion. 
Normally 
hatching. 
1 
Julv 25 
Aug. 6 
15 
15 
2 
Julv 26 
Aug. 7 
20 
20 
3 
Julv 28 
Aug. 8 
38 
37 
4 
Julv 30 
Aug. 10 
13 
12 
5 
Aug. 1 
Aug. 11 
18 
18 
6 
Aug. 2 
Aug. 13 
19 
19 
7 
Aug. 4 
Aug. 14 
99 
21 
Parasites placed with host August 4, having emerged August 3. New adults emerged August 30 to 
September 3. Twenty-seven to thirty-one days to complete the life cycle. Root-worm eggs within two 
to three days of hatching escaped parasitism. 
For each experiment egg clusters of the grape root-worm, each of 
a given age, ranging from 1 to 10 days, were subjected to the para- 
sites. The insects with the host were confined in large-size glass 
vials, which were covered with fine cloth. In Table XXI it is probable 
that the parasites oviposited shortly after being confined with the 
host, since they had emerged a few days previous to their confinement 
with fresh eggs. In the first experiment (Table XXI) the parasites 
were confined three days with the hosts. The two experiments of 
Tables XXI and XXII are practically identical, the second being made 
to check the results with those of the first one. The records for the 
normal hatching of the eggs are from another sot of records, since 
such data could not be obtained from parasitized eggs. The results 
of either experiment show that the parasites did not affect eggs which 
were within two or perhaps three days of hatching. There was 
no marked difference in the time of the development of the parasites 
from eggs of different ages. 
