Demodecidce, or Hair-follicle Mites 
79 
jointed legs, eight in number, are reduced to mere stubs in the adult. 
The larval form is hexopod. These mites thus show in their form a 
striking adaptation to their environment. In the sebaceous glands 
Mtyzva d*J hth Jap Ercfvtt .Arts 
Demode* follieulorum ( Owen ) 
63. Demodex follieulorum. Section through skin showing the 
mites in situ. Magnification of Nos. 1, 2, 6 and 7, X 150; 
Nos. 3 4, 5, X 450. After Megnin. 
and hair follicles they lie with their heads down (fig. 63). Usually 
there are only a few in a gland, but Gruby has counted as many as 
two hundred. 
The frequency with which they occur in man is surprising. Ac¬ 
cording to European statistics they are found in 50 per cent to 60 per 
cent or even more. Gruby found them in forty out of sixty persons 
