Feb. 17, 1923 
Aplastomorpha vandinei Tucker 
553 
LARVA STAGE 
The newly emerged larva is about 0.5 mm. long and 0.20 mm. wide. It is a footless, 
fleshy grub, widest at the head and thorax and tapering caudad. It is transparent, 
smooth, and shining; body composed of 13 segments besides the head; head provided 
with a pair of slender chitinized mandibles (PL 1, B) 0.019 to 0.02 mm. in length. 
If the egg is not attached to the host, the larva on hatching begins at 
once to seek for food, moving toward the host grub with an undulating 
movement of the body segments. Upon reaching its host the larva 
wanders about for a while over the grub but soon settles down to feed. 
It will feed on almost any part of the host. 
The parasitic grub feeds rapidly and in summer becomes full grown in 
from 3 to 5 days. During cold weather the larval period is somewhat 
prolonged. Table II will give an idea of the variation in the length of 
this period at various times of the year. 
Table II.— Life-history data on Aplastomorpha vandinei 
No. 
Date egg 
laid. 
Date egg 
hatched. 
Length of 
egg stage. 
Date 
pupated. 
Length of 
larval 
stage. 
Date adult 
emerged. 
Length 
of pupal 
stage. 
Period 
from egg 
to adult. 
Days. 
Days. 
Days. 
Days. 
I 
July 
27 
July 
29 
2 
Aug. 
3 
5 
A'ug. 
11 
8 
15 
2 
Aug. 
3 
Aug. 
5 
2 
Aug. 
10 
5 
Aug. 
U 
7 
14 
3 
Aug. 
5 
Aug. 
7 
2 
Aug. 
12 
5 
Aug. 
19 
7 
14 
4 
Aug. 
5 
Aug. 
7 
2 
Aug. 
11 
4 
Aug. 
18 
7 
13 
5 
Aug. 
6 
Aug. 
8 
2 
Aug. 
12 
4 
Aug. 
18 
6 
12 
6 
Aug. 
13 
Aug. 
15 
2 
Aug. 
18 
3 
Aug. 
24 
6 
II 
7 
Aug. 
1 3 
Aug. 
15 
2 
Aug. 
18 
3 
Aug. 
25 
7 
12 
8 
Aug. 
14 
Aug. 
16 
2 
Aug. 
20 
4 
Aug. 
27 
7 
13 
9 
Aug. 
15 
Aug. 
17 
2 
Aug. 
21 
4 
Aug. 
28 
7 
13 
10 
Aug. 
22 
Aug. 
24 
2 
Aug. 
27 
3 
Sept. 
3 
7 
12 
1 2 
*4 
1 7 
1 13 
11 
Oct. 
19 
Oct. 
21 
2 
Oct. 
26 
5 
Nov. 
9 
14 
21 
12 
Oct. 
20 
Oct. 
23 
3 
Oct. 
28 
5 
Nov. 
10 
13 
21 
13 
Oct. 
21 
Oct. 
23 
2 
Oct. 
28 
5 
Nov. 
11 
14 
21 
14 
Oct. 
26 
Oct. 
28 
2 
Nov. 
8 
11 
Nov. 
23 
U 
28 
15 
Oct. 
28 
Oct. 
30 
2 
Nov. 
• 8 
9 
Nov. 
27 
J 9 
30 
16 
Nov. 
2 
Nov. 
4 
2 
Nov. 
12 
8 
Dec. 
7 
25 
35 
17 
Nov. 
6 
Nov. 
8 
2 
Nov. 
18 
i° 
Dec. 
12 
24 
36 
18 
Nov. 
9 
Nov. 
11 
2 
Nov. 
23 
12 
Dec. 
28 
35 
49 
19 
Nov. 
23 
Nov. 
25 
2 
Dec. 
13 
18 
Jan. 
8 
26 
46 
20 
Nov. 
30 
Dec. 
5 
5 
Dec. 
22 
17 
Jan. 
19 
28 
2 50 
2 2.4 
2 10 
2 21.3 
2 33 * 7 
21 
Dec. 
2 
Dec. 
6 
4 
Dec. 
23 
17 
Jan. 
23 
3 i 
52 
22 
Dec. 
4 
Dec. 
8 
4 
Dec. 
23 
15 
Jan. 
13 
21 
40 
23 
Dec. 
5 
Dec. 
9 
4 
Dec. 
27 
18 
Jan. 
J 9 
23 
45 
24 
Dec. 
7 
Dec. 
11 
4 
Dec. 
27 
16 
Jan. 
20 
24 
44 
25 
Dec. 
8 
Dec. 
12 
4 
Dec. 
28 
16 
Jan. 
22 
25 
45 
26 
Jan. 
3 
Jan. 
8 
5 
Jan. 
21 
13 
Feb. 
17 
27 
45 
27 
Jan. 
5 
Jan. 
9 
4 
Jan. 
27 
18 
Feb. 
20 
24 
46 
28 
Jan. 
13 
Jan. 
*7 
4 
Feb. 
3 
17 
Feb. 
20 
17 
38 
29 
Jan. 
14 
Jan. 
18 
4 
Feb. 
5 
18 
Feb. 
20 
15 
37 
30 
Jan. 
19 
Jan. 
23 
4 
Feb. 
10 
18 
Feb. 
27 
17 
3 39 
8 4 
3 16. 6 
3 22. 4 
3 43 - 1 
1 Summer average. 
* Fall average. 
* Winter average. 
