404 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
quito. The wheal that develops is not so high, or as hard as when 
not rubbed, and it lacks much of its whitish color. Likewise, the red¬ 
dish area around the wheal is not differentiated. It is merged with 
the diffuse wheal and is of the same color. The effects of rubbing 
must be kept clearly in mind in interpreting the value of palliatives. 
Results 
The results obtained by testing the following; soap, bay rum, 95 
percent alcohol, 30 percent alcohol, hydrogen peroxide, glycerine, 
concentrated solution of ammonia, weak solution of ammonia, and in¬ 
digo in water are given above in tabular form. 
Summary 
1. Hydrogen peroxide, glycerine, and indigo apparently are worth¬ 
less as palliatives, and not only fail to have any alleviating effect on 
the injury from the mosquito bites, but apparently augment the injury. 
However, this apparent augmentation probably comes from the rub¬ 
bing which has the effect of increasing the itching pain at first and of 
diffusing the wheal, although usually neither the pain or swelling lasts 
as long. 
2. Soap, bay rum, dilute alcohol, and dilute ammonia have but slight 
value. Dilute ammonia is to be preferred of the four. If soap is 
rubbed into the skin some relief is obtained, which probably comes 
chiefly from the rubbing. 
3. Strong alcohol and strong ammonia have the greatest value as 
palliatives, both giving a marked reduction in pain. There is a tend¬ 
ency for the former to leave a hardened lump in the place of the wheal, 
and the latter is rather harsh on the skin. 
A NOTE ON THE LIFE CYCLE AND FERTILITY OF THE 
BODY LOUSE (PEDICULUS CORPORIS) 
By R. H. Hutchinson 
The following is a record of the rate of development and of the 
deposition of eggs of the body louse at body-surface temperature with 
unlimited opportunities for feeding. It is of special interest as giving 
a record of deposition higher than any heretofore published. It fully 
confirms the data given by Nuttall (Biology of Pediculus humanus, 
Parasitology, Vol. 10, No. 1) on the duration of the life cycle, and 
affords further evidence in support of his claim that the fertility of 
body lice has been greatly underestimated and that a true idea of 
