Pediculoides Ventricosus 
7 i 
sure is continued night after night by sleeping on an infested bed, the 
itching may become almost intolerable. Simultaneously, there 
appears an eruption which characteristically consists of wheals 
surrounded by a vesicle (fig. 55). The vesicle as a rule does not exceed 
a pin head in size but may become as large as a pea. Its contents 
55. Lesions produced by the attacks of Pediculoides ventri- 
cosus. After Webster. 
rapidly become turbid and in a few hours it is converted into a pustule. 
The eruption is most abundant on the trunk, slight on the face and 
extremities and almost absent on the feet and hands. In severe cases 
there may be constitutional disturbances marked, at the outset, by 
chilliness, nausea, ajid vomiting, followed for a few days by a slight 
elevation of temperature, with the appearance of albumin in the 
urine. In some cases the eruption may simulate that of chicken-pox 
or small-pox. 
