146 INFECTIOUS AND PARASITIC DISEASES. 



Another louse is found in the seams of the clothing 

 (pediculus vestimenti). 



This is usually found in uncleanly persons, 



Pediculus but may accidentally invade the fastidious. 



Capitis. A peculiarity of this louse is that its color 



varies v^ith its hosts, that is to say, it is 



Fig. 21. — Ovum 

 of head -louse glued 

 to hair; X70. (Ty- 

 son, after Braun.) 



Fig. 22. — Pediculus capitis. X ^S* 

 (Tyson, after Braun.) 



light grey on a Caucasian, yellowish or dark-grey on the 

 Mongolian, and black on the Negro. The individual 

 lice are difficult to find, but their presence is assumed 

 by finding eggs or "nits." These are little oval glisten- 

 ing bodies attached to the hairs. Treatment consists 

 in cutting the hair and v^ashing v^ith kerosene. 



