Pediculoides Ventricosus 71 



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, and 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. 



