ANIMAL PARASITES 165 



fact that at least four of them can find ample 

 standing-room on the space occupied by the head 

 of a pin. This parasite, like that of the humble- 



Fig. 108. One of the pincer-like organs of the 

 parasite of the beetle, holding a delicate fibre 



bee, is possessed of a pair of pincer-like organs on 

 its head, one of which is shown greatly magnified 

 in Fig. 108. 



As a concluding illustrated example of insect 

 parasites we can perhaps find no commoner insect 

 as a host than the common housefly, which every 

 one may capture who desires to study its parasitic 



