J 
376 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 11 
The records of six large maggots brought in from the field and sup¬ 
plied with five large aphids per day are as follows: 
Table III. Record of Six Apparently Mature Chloropisca glabra Maggots Brought in 
from the Field and Reared on Limited Food Supply 
Larva 
No. 
Number of aphids devoured per day 
Total 
aphids 
devoured 
indoors 
Total days 
indoors 
before 
pupation 
Daily 
average 
Aug. 8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
1 
3 
4 
3 
5 
4 
2 
5 
0 
0 
Pupa 
26 
9 
2.9 
2 
4 
3 
4 
1 
0 
Pupa 
12 
5 
2.4 
3 
0 
0 
4 
2 
0 
Pupa 
6 
5 
1.2 
4 
2 
0 
3 
1 
4 
3 
3 
Pupa 
16 
7 
2.3 
5 
5 
4 
0 
0 
0 
Pupa 
9 
5 
1.8 
6 
5 
3 
3 
0 
Pupa 
11 
4 
2.8 
The records of six large maggots brought in from the field and sup¬ 
plied with twenty large aphids per day are as follows: 
Table IV. Record of Six Apparently Mature Chloropisca glabra Maggots Brought in 
from the Field and Reared on Plentiful Food Supply 
Larva 
No. 
Number of aphids devoured per day 
Total 
aphids 
devoured 
indoors 
Total days 
indoors 
before 
pupation 
Daily 
average 
Aug. 11 
12 
13 
14 
15 
16 
17 
18 
1 
5 
8 
7 
9 
8 
10 
5 
/ 
Pupa 
52 
7 
7.4 
2 
5 
6 
8 
4 
8 
7 
6 
Pupa 
44 
7 
6.3 
3 
6 
4 
4 
5 
Pupa 
19 
4 
4.8 
4 
1 
2 
6 
4 
4 
1 
Pupa 
18 
6 
3.0 
5 
2 
6 
6 
5 
4 
Pupa 
23 
5 
4.6 
6 
2 
8 
8 
1 
1 
6 
Pupa 
26 
6 
4.5 
From the above data the length of larval life appears to be quite 
variable. Larva kept in tin boxes indoors from the time of hatching 
completed their growth and pupated in from 9 to 13 days while several 
apparently mature maggots brought in from outdoors continued to 
feed indoors for 9 days before pupating. The length of the larval 
period in the field probably varies from 10 to 20 days. 
The number of aphids devoured by a single maggot apparently 
varies according to the supply and accessibility of the aphids. Three 
maggots were able to complete their growth and pupate on a food sup¬ 
ply of only 21 large aphids per maggot, while another maggot after it 
was apparently full grown consumed 52 aphids! It is probable that 
maggots under natural conditions in root-louse colonies where food is 
always within their reach would each consume as many as 75 aphids. 
