168 Biology of Pediculus humanns 
Stage and 
No. of lice Temp. Longevity when fasting 
tested 
°c.- 
Conditions 
(abbreviations: d. = dead; f. =feeble) 
1st st. L. 
31° 
on cloth, in dark 
8 hrs. 
24 hrs. 
(similar results on 
body at 
10 
thermostat, dry 
4 d. 6 f. 
alld. 
33° C.) 
20 
17° 
ditto in room, dry 
24 hrs. 
33 hrs. 
48 hrs. 54 hrs. 
7 d. 3 f. 
4 d. ■ 
4 d., 5 dying alld. 
10 
12° 
ditto in damp re¬ 
48 hrs. 
72 hrs. 
77 hrs. 102 hrs. 
121 hrs. 
frigerator 
1 d. 
5 d. 
Id. 1 d., 2 dying 
all d. 
Adults 
2<?3$ 
33° 
on arm (wristlet) 
23 hrs. 
27 hrs. 
30 hrs. 
2 <J 3 ? d. 
1 9 d., 2 dying last 9 d. 
2<? 82 
30° 
on hair, in dark 
23 hrs. 
29 hrs. 47 hrs. 
thermostat, dry 
1 S d. 1 $ dying 
5 9 d. last 9 d. 
3<J 7$ 
20° 
on hair, in dark 
48'hrs. 
58 hrs. 
72 hrs. 78 hrs. 
96 hrs. 
room, dry 
1 <? 1 9 d. 
1<J d. 
1 cJ 3 9 d. 2 9 d. 
last 9 d. 
6<? 5$ 
12° 
on cloth in damp 
96 hrs. 
102 hrs. 
120 hrs. 127 hrs. 
143 hrs. 
refrigerator 
1 $ d. 
2 1 9 d. 
2 cJ 3 9 d. 1 $ dying 
last 9 d. 
Summary regarding the longevity of Starved Lice. 
A selection confined to those of the foregoing records giving the 
longest spans of life observed under different conditions, gives the 
following general result: 
Greatest 
recorded 
Temperature 
Corporis 
longevity 
°C. 
Authority 
1st st. larvae, in the dark, unfed 
27 hrs 
33° dry 
Nuttall 
once fed 
23 „ 
33° „ 
,, 
unfed 
81 „ 
20° „ 
99 
once fed 
101 „ 
20° „ 
99 
unfed 
127 „ 
12° „ 
99 
unfed 
127 „ 
12° „ 
99 
Various unspecified stages, not stated 
i day 
40° dry 
Various authors cited 
if fed or not, etc. 
1 „ 
37° 
in foregoing tables 
3 days 
36° „ 
99 >• 
3 „ 
CO 
o 
o 
9 9 9 ) 
5 „ 
30° damp 
99 99 
5 „ 
20° dry 
99 99 
6 „ 
20° damp 
99 99 
7 „ 
16-18° dry 
99 99 
5 „ 
15-17°. „ 
99 99 
7 „ 
15-17° damp 
99 99 
9 „ 
10-12° 
99 99 
9 „ 
6° 
99 99 
Capitis 
10 „ 
Died within 
5° 
99 99 
1st st. larvae, in the dark, unfed 
24 hrs 
31° dry 
Nuttall 
54 „ 
17° „ 
99 
ca. 110 „ 
10° damp 
99 
Adults, in the dark, unfed 
30 hrs 
33° „ 
99 
47 „ 
30° „ 
99 
96 „ 
to 
o 
o 
143 „ 
12° 
j.w ,, 
99 
