THE MYRIAPODS AND ARACHNIDS 83 



very minute mites which produce the disease, now hap- 

 pily becoming more rare, known as the itch. 



FIG. 70. Sar copies scabei, female FIG. 71. Demodex follicu- 



itchmite. (AfterLeuckart.) lorum, follicle mite. (After 



Lud wig-Leunis . ) 



A degenerate form, Demodex, is a common parasite 

 in the follicles of the human face and produces the ap- 

 pearance known as black heads. 



