Nov. 19,1917 
Three-Lined Fig-Tree Borer 
373 
average being approximately 5.6 days. The comparative regularity of 
the time required for incubation appears to be due to the relative 
uniformity of temperature and humidity prevailing in the bark tissues 
of the fig trees. The complete record on the incubation of eggs of 
the fig-tree borer at New Orleans, Ta., for the seasons of 1914 and 1915 
is given in Table I. 
TABLE I.— Incubation period of eggs of the three-lined fig-tree borer , New Orleans , La. t 
IQ14 and iq1 5 
Date of dep¬ 
osition. 
Date of 
hatching. 
Incuba¬ 
tion 
time. 
I 9 I 4 * 
I 9 I 4 - 
Days . 
July 2 
July s 
3 
July 4 
July 9 
5 
July 27 
July 11 
Aug. 1 
7 
5 
July 28 
Aug. 3 
6 
July 31 
Aug. 4 
4 
...do. 
Aug. 5 
5 
...do. 
Aug. 6 
6 
Aug. 8 
8 
Aug. i* 
Aug. 5 
4 
.. .do_ 
Aug. 6 
5 
Aug. 3 
Aug. 7 
4 
Aug. 8 
5 
Aug. 11 
Aug. 14 
3 
Aug. 16 
5 
M 1915- 
May 24 
I 9 I 5 * 
May 31 
7 
June 1 
8 
May 25 
June 2 
8 
May 26 
June 1 
6 
...do. 
June 2 
7 
May 29 
June 5 
7 
May 30 
June 6 
7 
June 5 
6 
Number of 
eggs in the 
record. 
9 
17 
5 - 
6 
9 
6 , 
2 
4 
1 
6 
1 
7 
1 
7 
1 
Number of 
eggs in .the 
record. 
2. 
2. 
1. 
3 * 
1. 
3 * 
4. 
5 - 
7 * 
8. 
10. 
2 . 
3 * 
7 - 
11. 
6 . 
*3 • 
2. 
5 - 
7 - 
210 
Date of dep¬ 
osition. 
I9IS- 
June 1 
...do. 
June 2 
,. .do. 
,..do. 
June 3 
June 7 
.. .do__ 
... do 
June 9 
June 11 
.. .do. 
June 12 
...do. 
June 14 
June 15 
June 18 
...do_ 
June 20 
June 26 
Maximum. 
Minimum. 
Average... 
Date of 
hatching. 
I 9 I 5 
June 
June 
June 
June 
June 
...do. 
June 11 
June 12 
June 13 
...do. 
June 16 
June 18 
June 15 
June 18 
...do. 
June 20 
June 23 
June 2 5 
...do. 
June 30 
Incuba¬ 
tion 
time. 
Days. 
6 
7 
5 
4 
6 
5 
4 
5 
6 
4 
5 
7 
3 
6 
4 
5 
5 
7 
5 
4 
8 
3 
5*6 
HATCHING 
When the development of the egg is completed and the larva ready to 
issue it chews its way out through the upper end of the eggshell. The 
larvae generally feed at first upon the eggshell, sometimes devouring 
nearly all of it before tunneling into the bark layers. 
LARVA OR BORER 
description 
The larva, or borer proper (Pi. 35, B, C), is white to cream-colored, a 
legless grub, varying in length from about 0.125 inch (3 mm.) just after 
issuance from the egg to about 1.7 inches (43 mm.) when fully grown. It 
is broadest across the first thoracic segment, tapering gradually from 
the latter to the tip of the abdomen. The head is subrectangular, its 
sides converging posteriorly. The anterior border has a small 4-jointed 
appendage at each side of the base of the mandible. The anterior 
