260 ORDER VII. Onifcus. 



The Onifci change their fkin, like many other 

 apterous infects ; it is compofed of feveral cruf- 

 taceous plates. 



They are found frequently in houfes, gar- 

 dens, and woods ; fome fpecies live in the 

 water •, they are fometimes called Hog- lice, and 

 one fpecies is made ufe of in medicine. 



Genus 



