66 PARASITOLOGY. 
to have four pair of legs. Another moulting brings 
the larvae to the pupal stage, with legs fully devel- 
oped, and after still another moult they are sexually 
mature. 
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& 
Of the varieties of Demodex Folliculorum enumer- 
ated only two are common in the United States. 
DEMODEX FOLLICULORUM, variety Canis. 
Ffistory.—First studied in Europe. It is common 
in many localities of the United States. 
