ACARINA PARASITES. 



453 



Fig. 220. Parasites. Acarina. 



1, Louse Human; magnified 50 diameters. 2, Acarus domcsticus, Cheese-Mite; 

 magnified 50 diameters. 3, Acarus Scabiei, Itch-Insect; magnified 350 

 diameters. 4, Entozoon folliculorum, Grub, from the human skin in various 

 stages of existence, from the egg upwards ; magnified 250 diameters. (Within 

 the small circles it is intended to represent the same about the natural size.) 



