212 
Biology of Pediciilus humanus 
Box 
Outside of box 
Inside 
Lice found 
No. 
and gauze 
of box 
Cloth 
in the box 
Pigmentation 
1 
black 
black 
black 
23 
(5^,5$, 13 1..) 
5 
(5L.) 
• •• 
moults 
2 
black 
white 
black 
22 
(7^,6$, 9 L.) 
• ••• 
12 
(4<J,2$,6L.) 
• •• 
moults mostly 
• ••#,few ••••• 
few O 
3 
black 
white 
white 
25 
(6<J, 9$, 10 L.) 
O 
9 
dS, 1$,7L.) 
• to ••• 
moidts mostly 
OO, few # • • 
4 
white 
white 
white 
19 
(4<J, 1?, 14 L.) 
O 
2 
(!<?, 1L.) 
• 
moults 
O, but 2 • • • 
5 
white 
black 
white 
17 
(6cJ, 5$, 6L.) 
O 
14 
(8 d, 1 ?, 5 L.) 
• •• 
3 
(1 St 2 L.) 
• ••• 
moults mostly 
o, few • • • 
6 
white 
black 
black 
31 
VS, 7$, 17 L.) 
3 
(3L.) 
• •• 
moults 
Note. The degrees of pigmentation are 
indicated as follows in 
the foregoing and succeeding 
records: 
•••••= 
very dark, # # # # = 
:dark, # # % = medium, # = slight, O = pale to very 
pale. 
Experiment VI (red and yellow). 
Adults of the same lot as in Expt. V were put to lay (1. vii. 18) in two boxes 
with the inside, outside, gauze and contained cloth coloured (a) pale yellow 
with picric acid and ( b ) bright red with ink. The eggs began to hatch on the 
ninth day on yellow, on the eighth day on red, and the adults emerged 11 days 
later. The examination on 23. vii. revealed the following: 
Pigmentation 
Yellow box contained 
24 
(6<?, 7 9, 11 L.) 
O or f 
moults 
O or • 
Red box contained 
35 
(13 c?, 7 9, 15 L.) 
2 
(2 L.) 
• •• 
moults 
• • • • • to • • • • 
Experiment VII (lice on white, in complete darkness). 
Dark adults of the same lot used in Expt. V, were put to lay on 2. vii. 18 
in two boxes: (a) all black (like box 1, Expt. Y) and (6) all white (like box 4, 
Expt. V). These boxes were enclosed in thick, tightly closing wooden boxes 
blackened inside and outside with India ink. The boxes were opened twice 
daily in the dark for the purpose of feeding the adults on three successive days 
during which they oviposited. The adults were then removed, and the boxes 
with eggs were returned to the thermostat for six days. After this, the hatching 
having commenced, the young lice were fed twice daily, the boxes containing 
them being applied to the arm in the dark room, the arm being swathed in 
