Nov. 19,1917 
Three-Lined Fig-Tree Borer 
377 
turn, the rear patch being opposite its lateral marginal projection, the 
remaining 5 hairs set irregularly along the middorsal line and the hind 
margin of the pronotum. On the mesonotum are about 25 similar hairs 
so arranged as to form a V, the point directed toward the tip of the 
abdomen. A similar but larger V occurs on the mesothorax. On the 
dorsum of the first two abdominal segments is a thick brush of minute 
brown hairs, divided in the middle by the median dorsal line, consisting 
of the following numbers of hairs: On segment 3, about 44; segment 4, 
about 22; segment 5, about 19; segment 6, about 16; and segment 7, about 
10. A group of similar setae occurs at the base of each antenna and on 
the labrum and clypeus. 
The life of the pupa is passed entirely within the sawdust cell con¬ 
structed by the borer in its tunnel in the wood. When the pupal skin 
has been cast and the newly formed adult has hardened somewhat, it 
chews a circular hole through the bark and emerges into the outer air. 
The exit holes of the adult beetle are almost perfectly circular, and the 
occurrence of such holes in trunk and limbs indicates the escape of 
adults, not the entrance of larvae. 
DURATION OF THE PUPAL STAGE 
The duration of the pupal stage, like that of the larval stage, is quite 
irregular. The extreme minimum duration in the specimens under obser¬ 
vation was 5 days, but this occurred only in two cases. The extreme 
maximum was 73 days. The average duration of the pupal stage for all 
of the 70 specimens observed through that stage was 24 days. The 
complete records on the duration of the pupal stage are given in Table 
III. 
Table III .—Duration of the pupal stage of the three-lined fig-tree borer, New Orleans, La 
* I 9 I 4> rgis, and igi6 
No. 
Bate of 
pupation. 
Date of 
emergence. 
1 
Duration 
of pupal 
stage. 
1914 - 
1914. 
Day 8. 
I. 
Sept. 1 
Sept. 15 
14 
2. 
...do. 
Sept. 22 
21 
3 . 
...do. 
Sept. 14 
13 
4 . 
...do. 
Sept. 22 
21 
5 . 
...do. 
Sept. 15 
14 
6. 
Sept. 9 
Sept. 29 
20 
7 . 
...do. 
Sept. 22 
13 
8. 
...do. 
...do. 
13 
9 . 
.. .do. 
Sept. 15 
6 
10. 
...do. 
Sept. 22 
13 
11. 
Sept. 29 
Oct. 16 
*7 
* 9 i 5 - 
, r I 9 I 5 - 
12. 
Apr. 24 
May 15 
21 
13. 
May 25 
June 5 
11 
14. 
May 28 
June 16 
19 
15 . 
Aug. 17 
Sept. 6 
20 
No. 
Date of 
pupation. 
Date of 
emergence. 
Duration 
of pupal 
stage. 
I 9 I 5 * 
I 9 I 5 - 
Days. 
16. 
Aug. 17 
Sept. 6 
20 
17 . 
Aug. 31 
14 
18. 
Aug. 19 
...do. 
12 
...do. 
...do. 
12 
20.. 
Aug. 27 
Sept. 13 
17 
21 . 
...do. 
...do. 
17 
22 . 
., .do. 
...do. 
17 
... do. 
... do. 
t 
17 
24 .. 
...do. 
. ..do. 
17 
...do. 
Sept. 16 
f 
20 
*0. 
26. 
Aug. 71 
... do. 
l6 
27. 
& • 0 
Sept. 12 
12 
28. 
...do. 
...do. 
12 
29. 
Sept. 7 
Sept. 16 
9 
3 °. 
...do. 
Sept. 18 
11 
31. 
.. do. 
...do. 
11 
32 . 
•«• do. • • • • 
...do. 
11 
