A. Bacot 
231 
Habits of the insects noted when reared under the 
conditions mentioned above. 
P. capitis is much the more active insect of the two. In egg laying 
either species can adapt itself to cloth or hair. P. capitis will sometimes 
lay eggs on cloth, although there are hairs in the box. P. humanus, 
on the other hand, seldom if ever lays on hair while there is cloth in the 
box and when compelled to do so the females of this species appeSr to 
be less skilful in cementing, or careful in getting the long axis of the 
egg into alignment with the hair. When forced to lay on hair they not 
infrequently attach the egg at an angle to the axis of the hair. 
Two or three $$ and of P. humanus were placed in a small box 
with human hairs of two or three centimetres long from the forearm. 
The insects were liberally fed for three days, during this period they 
laid 35 eggs. Of these one was attached to the side of the box and was 
also cemented to the hairs which clung together owing to eggs having 
