CONTENTS. 



Page. 



Structure 7 



Life history 9 



Geographical distribution 10 



Abundance 11 



Historical 11 



Classification 12 



Table of the families 14 



Family Argasidfie 14 



Table of the genera 14 



Genus Argas 14 



Genus Ornithodoros 16 



Family Ixodidfe 20 



Table of the genera 20 



Genus Ceratixodes 20 



Genus Ixodes 22 



Genus Hjipmaphysalis 32 



Genus Rhipicephalus 34 



Genus Margaropus 35 



Genus Amblyomma 37 



Genus Dermacentor 42 



Unplaced species 51 



Species erroneously accredited to the United States 52 



Catalogue 52 



Bibliography 56 



Index 61 



3 



