ORDER HEMIPTERA. 85 



but at present not very well known. Almost every mammal has a 

 louse peculiar to itself. 



Three species infest man. The Head Louse (Fediadus capitis)^ 

 found on the head, especially in children. The Body Louse p^j^i^ 

 {Pedicidus vestiffientt), found in the clothes ; and the Crab Louse 

 {Phthirius inquifialis), a broader and shorter insect, found in the 

 hair on the face and body of uncleanly persons. 



The lice infesting different races of men differ in colour — thus, 

 those found on niggers are black ; and those on Europeans are 

 whitish. 



Other species of lice infest the dog, cat, pig, mouse, elephant, 

 monkey, etc. ' • '■ . ^ />'c*--v.ot^^^'>- aw^A*ja 



The Pedicididce undergo no metamorphoses. ' 



