CONTENTS. 



PAGE 



Peefacb iii 



TEEQUEIfCY OF OCCUEEBNCE AND ErFECTS OF THE PaEASITISM OF DeUODF-X ON 



THE Host 1 



Demodex and Man 1 



rdlicular or Demodectic Mange of the Dog and its Treatment ... 3 



Demodectic Mange of the Cat 6 



„ ,, the Horse .... 6 



„ „ Cattle • 7 



» „ the Pig 8 



„ „ tlie Goat 9 



Beief Historical Account of the Geoup 9 



Oeigin and Affinities of the DemodicidvE 10 



Habits . 12 



exteenal moephology 12 



Capitulum 12 



Legs 15 



Respiratory System . 15 



Sexual Openings and Penis 10 



Taxonomy 17 



Systematic List of the Species and Vaeieties of the Genus Demodex, with 

 THEiE Hosts and known Disteibution 18 



Desceiptions of iue Species and Vaeieties 19 



BlBLIOGEAPHY 39 



Index 40 



Explanation of Plates 42 



