250 
Bionomics of Pediculiis 
TABLE XIV. 
Fertility of Pediculus capitis. Particulars of hatching after 
a second d was placed with the 
Refer¬ 
ence 
no. of 
? 
Day, count¬ 
ing from 
maturity of 
the $,when 
the second 
c? was 
introduced 
Days counting from the date 
on which the second d' 
was placed with the ? 
Total 
eggs 
laid 
per? 
Total 
of eggs 
hatched 
Per¬ 
centage 
fertile 
lull 
12th 
13th 141h 
15th 
16th 
Remarks 
4 
27th 
1 
— 
- - 
— 
— 
4 
1 
25% 
died 31st day 
3 
32nd 
1 
— 
- - 
— 
— 
3 
1 
33% 
,, 34th ,. 
13 
28th 
— 
— 
- - 
— 
— 
13 
nil 
— 
„ 35th „ 
14 
25th 
— 
— 
- - 
— 
— 
18 
nil 
• _ 
>» 31st 
15 
27th 
— 
1 
— 1 
3 
1 
25 
6 
24% 
„ 37th „ 
* Although no more eggs hatched the balance had mostly been fertilized, the larvae 
developed but died just prior to hatching. 
TABLE XV. 
Pediculus capitis. Summary of Tables X, XII — XIV. 
3; 
.O 
£> 
G 
« a 
>* fc- 
e# 3 
® iti _ 
oj 3 o 
<r. d 
Im 
0 ^ 
K d 
V 
*0 
u 
a> 
.0 
0 
3 
C 
3 
C 
if « 
= S.5 
o c o 
ogg 
0.2 
0 
Ui 
0 
£ ^ 
s’" 
S'® 
•“ a> 
S-c 
0 « 
KeferenCi 
of ¥ 
V 
a 
I*..- 
Pi O 
ISg. 
.r « c 
fc* c .2* 
1 si 
,.0.2 
"II 
= 2 0 
Sr.JSi; 
.0 p. 
32 
Ap^iroxii 
period of 
in days 
.2 ® 
a 
£2 
11 
3 2 ' 
Percents 
tile eggs 
Bn 
,f 3 
S 
H 0 ? 
o'o 
•<ii 
sS 
c a 
^ ® 
0 
f 4) 0 
Oh « J 
1 
2 
no choice 
2 
32 
40 
1 
25% 
■— 
— 
40 
2-5 
2 
25% 
2 
1 
doubtful 
3 
nil 
62 
at least 7 
50% 
— 
— 
62 
3-9 
31 
50% 
3 
1 
>» 
2 
99 
109 
99 
„ 3 
15% 
3 
33% 
112 
3-6 
17 
15% 
4 
2 
9f 
3 
99 
81 
9 
„ 12 
. 54 % 
4 
25% 
85 
3-3 
45 
53% 
5 
2 
same day 
3 
99 
25 
9 
„ 8 
84% 
— 
— 
25 
31 
21 
84% 
6 
3 
doubtful 
3 
9 
66 
„ 8 
67% 
— 
— 
66 
4-1 
44 
67% 
7 
3 
,, 
2 
99 
138 
99 
11 
44% 
3 
nil 
141 
40 
61 
43% 
8 
3 
„ 
2 
,, 
107 
99 
„ 12 
65% 
— 
— 
107 
4-7 
70 
65% 
9 
3 
same day 
2 
,, 
101 
99 
„ 11 
45 % 
9 
nil 
110 
3-5 
45 
41 % 
10 
4 
no choice 
3 
>» 
102 
9 9 
„ 10 
38% 
8 
nil 
110 
3-8 
39 
36% 
11 
4 
1 
2 
79 
120 
99 
„ 7 
29% 
— 
— 
120 
4.4 
35 
29 % 
12 
4 
probably 3 
3 
99 
36 
about 7 
69% 
— 
— 
36 
30 
25 
69% 
13 
4 
no choice 
3 
,, 
82 
at least 11 
44% 
13 
nil 
95 
31 
36 
38% 
14 
4 
doubtful 
3 
99 
85 
„ 1 
29% 
18 
nil 
103 
3-8 
25 
24% 
15 
4 
99 
2 
3 
92 
99 
„ 10 
50% 
25 
24% 
117 
3-7 
52 
44% 
16 
4 
1 
nil 
nil 
— 
— 
nil 
nil 
nil 
nil 
17 
4 
doubtful 
4 
>» 
77 
at least 9 
45 % 
— 
•— 
77 
3-7 
35 
45% 
18 
4 
99 
3 
66 
99 
„ 12 
71% 
— 
— 
65 
3-8 
46 
71 % 
19 
4 
9* 
2 
99 
11 
3 
91% 
— 
— 
11 
2-2 
10 
91% 
20 
4 
,, 
2 
99 
31 
at least 6 
35% 
— 
— 
31 
31 
11 
35% 
Longest ^ life 30 days. Longest 5 life 38 days. Average 9 life 27 days. Number of ?? 
fertilized by one (J 10. Eggs laid by unfertilized $9 did not hatch. The period of 
fertility lasts about 7 to 12 days. The greatest number of eggs fertilized by a 9 after 
separation from a (5' was 70 (9 No. 8 ). The egg laying record in the above experiment 
ranges between 26 and 141 with an average of 88 and a daily average of 3-7. It is 
probable that owing to the unnatural conditions of the experiment that these figures 
!<>■« too low as an estimate of the egg production of wild lice. 
